





                           DOUBLETALK PC/LT USER'S MANUAL

                      Copyright (C) 1991-1997 RC Systems, Inc.
                                All rights reserved.



                                    Tech Support

                               Phone: (425) 355-3800
                             E-mail: support@rcsys.com



































                                  RC Systems, Inc
                                  1609 England Ave
                                 Everett, WA 98203
                                 Ph: (425) 355-3800
                                Fax: (425) 355-1098

                                http://www.rcsys.com


                                         i






                                  LIMITED WARRANTY



                                   Short Version

    If anything should go wrong with your DoubleTalk, and it's not your fault,
    we'll fix it for free, up to one year after purchasing it.



                                    Long Version
         (Our lawyers made us put this here. It makes them feel important.)

    RC SYSTEMS, INC. ("RC Systems") warrants this product against defects in
    material and workmanship for a period of ONE (1) YEAR from the date of
    original retail purchase by the original consumer purchaser.

    If you discover a defect in this product, RC Systems will, at its option,
    repair, replace or refund the purchase price of this product at no charge
    to you, provided you return it during the warranty period, transportation
    charges prepaid, to the dealer from whom you purchased it or to RC Systems.
    A copy of your purchase receipt or other proof of date of original consumer
    purchase must be provided with each product returned for warranty service.
    Please also attach your name, address, telephone number, and a complete
    description of the problem when returning any RC Systems product for
    warranty service.

    You may request additional information about this warranty by contacting
    the RC Systems dealer from whom the product was purchased, or by contacting
    RC Systems directly. This warranty applies only to products manufactured by
    RC Systems; RC Systems does not warrant any products that are not RC
    Systems products. This warranty does not apply if the product has been
    damaged by accident, abuse, misuse or misapplication, has been modified
    without the written permission of RC Systems, or if any RC Systems serial
    number has been removed or defaced.

    ALL IMPLIED WARRANTIES, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND
    FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM
    THE DATE OF ORIGINAL RETAIL PURCHASE OF THIS PRODUCT.

    THE WARRANTY AND REMEDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL
    OTHERS, ORAL OR WRITTEN, EXPRESS OR IMPLIED. No RC Systems dealer, agent or
    employee is authorized to make any modification, extension or addition to
    this warranty.

    RC SYSTEMS IS NOT RESPONSIBLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL
    DAMAGES RESULTING FROM ANY BREACH OF WARRANTY, OR UNDER ANY OTHER LEGAL
    THEORY, INCLUDING LOST PROFITS, GOODWILL, DOWNTIME, DAMAGE TO OR
    REPLACEMENT OF EQUIPMENT AND PROPERTY, AND ANY COSTS OF RECOVERING,
    REPROGRAMMING OR REPRODUCING ANY PROGRAM OR DATA STORED IN OR USED WITH RC
    SYSTEMS PRODUCTS.



                                         ii






    Some states do not allow the exclusion or limitation of incidental or
    consequential damages or limitations on how long an implied warranty lasts,
    so the above limitation or exclusion may not apply to you. This warranty
    gives you specific legal rights, and you may also have other rights which
    vary from state to state.


















































                                        iii






                                 TABLE OF CONTENTS


  INTRODUCTION................................................................1

  ABOUT THIS MANUAL...........................................................1

  SYSTEM REQUIREMENTS.........................................................2
    DoubleTalk PC.............................................................2
    DoubleTalk LT.............................................................2

  INSTALLATION................................................................3
    DoubleTalk PC.............................................................3
    DoubleTalk LT.............................................................4
    Utilities Installation....................................................5
    Windows 95/98 System Registration.........................................6
    What's Next?..............................................................6

  UTILITIES...................................................................7
    Disk Contents.............................................................7
    SmartTalk.................................................................8
      TTS.....................................................................9
      LPC.....................................................................9
      PCM.....................................................................9
      TGN.....................................................................9
    DoubleTalk Drivers.......................................................10
      Talking printer........................................................10
        Installing DTPRN.....................................................10
        Disabling DoubleTalk's buffer........................................11
        Removing DTPRN from memory...........................................11
        Sending text and commands............................................11
        Stopping speech production...........................................12
      Word 5.0 talking printer...............................................12
      IBM Speech Adapter emulator............................................13
      IBM Screen Reader......................................................14
      SSIL driver............................................................15
      Davidson drivers.......................................................16
      Windows sound driver...................................................17
        Windows 3.1..........................................................17
        Windows 95...........................................................17
        Configuring the sound driver.........................................18
    Speaking Spanish.........................................................18
      Configuring SSIL-based screen readers for Spanish......................19

  OPERATIONAL DESCRIPTION....................................................19
    TTS Operating Modes......................................................19
      Text mode..............................................................20
      Character mode.........................................................20
      Phoneme mode...........................................................20
    Translation Accuracy.....................................................20
    Commands.................................................................21
      Command formats........................................................21
      The command character..................................................21


                                         iv






        Changing the command character.......................................21
      Command parameters.....................................................22
    Command Descriptions.....................................................22
      Voice (nO).............................................................22
      Articulation (nA)......................................................23
      Expression (E/nE)......................................................23
      Monotone (M)...........................................................24
      Formant Frequency (nF).................................................24
      Speed (nS).............................................................24
      Pitch (nP).............................................................24
      Volume (nV)............................................................24
      Tone (nX)..............................................................24
      Reverb (nR)............................................................24
      Punctuation Filter (nB)................................................25
      Timeout Delay (nY).....................................................25
      Load Exceptions (L)....................................................26
      Enable Exceptions (U)..................................................26
      Reinitialize (@).......................................................26
      Zap Commands (Z).......................................................27
      DTMF Generator (n*)....................................................27
      Tone Generators (J/nJ).................................................27
      Text Mode/Delay (T/nT).................................................27
      Character Mode/Delay (C/nC)............................................28
      Phoneme Mode (D).......................................................28
        Phoneme attribute tokens.............................................28
        Applications of Phoneme mode.........................................30
      Sleep Timer (nQ).......................................................30
      PCM Mode (#/n#)........................................................31
      Protocol Options (nG)..................................................31
      Index Marker (nI)......................................................31
      Interrogate (?)........................................................32
      Clear (Control-X)......................................................32
    Command Summary..........................................................33

  APPENDIX A.................................................................34
    LPC Word Lists...........................................................34

  APPENDIX B.................................................................38
    DoubleTalk LT Cable Connections..........................................38

  APPENDIX C.................................................................39
    Specifications...........................................................39
      DoubleTalk PC..........................................................39
      DoubleTalk LT..........................................................40











                                         v







  INTRODUCTION

    DoubleTalk is a voice synthesis/sound system which supports virtually all
    of the voice technologies in use today, including text-to-speech (TTS),
    LPC, PCM, ADPCM and CVSD. With it, your IBM-compatible computer will be
    able to speak to you from your own programs, as well as many programs
    specifically written for voice or sound, including Windows-based
    (multimedia) programs. Most programs written for the older Echo speech
    synthesizers will also work with the DoubleTalk LT.

    Among DoubleTalk's features are a built in, 16-bit microprocessor, 520
    Kbytes of on-board memory, integrated text-to-speech converter and LPC
    decoding processor - all of which leave your computer's resources
    completely free for running your application programs. There's even an
    advanced power management system built in - less demanding tasks use less
    power than more computationally-intensive ones do. As a matter of fact,
    when DoubleTalk is doing the "least demanding" task of sitting idle, it
    consumes about 500 times less power than a typical 60 watt household light
    bulb!

    There are many ways you can use your DoubleTalk synthesizer. If you write
    your own programs, you can easily add voice output to them. Commercial
    programs specifically written to work with DoubleTalk, as well as many that
    work with IBM's Speech Adapter, can be used with DoubleTalk. Windows-based
    applications supporting digital sound can also be used. There's even a
    program on the included Utilities disk that allows you to install
    DoubleTalk as a "talking" printer or communications device, enabling you to
    read files from many text-based programs with voice output!

    DoubleTalk is also supported by virtually all of the major "screen reader"
    programs that give blind users access to their computers.


  ABOUT THIS MANUAL

    This manual covers both the DoubleTalk PC and DoubleTalk LT voice
    synthesizers. DoubleTalk PC is a card that plugs into a standard PC/AT
    eight or 16-bit slot in your computer. DoubleTalk LT is an external, stand-
    alone version of DoubleTalk PC that plugs into a serial port of your
    computer, instead of an internal slot. This can be beneficial when you need
    to share DoubleTalk with more than one computer, or where an internal slot
    is not available (as in many laptops and notebooks). DoubleTalk LT can also
    be used with non DOS- based computers, such as the Apple II family and
    Macintosh.

    We have attempted to write this manual as concisely and clearly as
    possible. The subjects of interest to everyone, such as installing
    DoubleTalk, are contained in the first part of the manual. The more complex
    (and usually boring to non-programmer types) subjects are left to the
    latter parts of the manual, which you may skip entirely if you wish. In
    particular, the manual enters the Twilight Zone in the section entitled



  RC SYSTEMS                           - 1 -                    DOUBLETALK PC/LT






    "Operational Description," and it never really does return to reality after
    that. However, should you have difficulty falling asleep some night...

    For the serious user, software developer, or otherwise deranged person, a
    DoubleTalk Developer's Tools disk is available from RC Systems. It is not a
    product for the novice user or faint-hearted, as it is quite technical in
    nature (it uses words like "bits" and "I/O ports"). Topics covered include:

    .  Using the exception dictionary & compiler

    .  Using DoubleTalk's LPC and PCM modes

    .  Wave/PCM file conversion utility

    .  Programming DoubleTalk's tone generators

    .  Hardware interface with example driver source code

    .  QuickBASIC (QB), Basic PDS 7 (QBX) and C libraries

    .  Programming with the DTPRN and INT4DAPI drivers

    .  Programming tips


  SYSTEM REQUIREMENTS


  DoubleTalk PC

    DoubleTalk PC will work with an IBM PC, XT, AT, 386, 486, Pentium, PS2-25,
    PS2-30 or any of the many "compatibles" on the market. DoubleTalk PC will
    not work in computers equipped with "Microchannel" style slots, such as the
    PS2-80. In other words, virtually any computer with a standard eight or 16
    bit slot (also known as a "PC/AT" or "ISA" slot) will work with DoubleTalk
    PC. No interrupts (IRQ's), DMA, or system memory is used by DoubleTalk PC.
    (Try to find another add-in card nowadays that can claim that!)


  DoubleTalk LT

    DoubleTalk LT requires only a serial port operating at 9600 baud, 8 data
    bits, 1 stop bit, and no parity (9600, N, 8, 1). The connecting cable is
    designed to be plugged into a standard 9-pin serial connector, found on
    most PCs.










  RC SYSTEMS                           - 2 -                    DOUBLETALK PC/LT






  INSTALLATION


  DoubleTalk PC

    Installing DoubleTalk PC in your computer is easy. Before you begin, be
    sure you have the following:

    .  An open 8-bit or 16-bit ISA system expansion slot on your computer's
       motherboard

    .  MS-DOS or PC-DOS Version 2.0 (or later) present in your computer

    .  A medium screwdriver or 3/16" nut driver or wrench

    Then follow these steps:

    1. Turn off the power to the computer and unplug the power cord. Attempting
       to install a board in the computer while the computer's power is on can
       cause permanent damage to both the board and the computer.

    2. Remove the cover from your computer. Refer to your computer's owner's
       guide if you are not sure how to remove its cover.

    3. Choose any empty expansion slot and remove the small metal cover by
       removing the retaining screw with a screwdriver or nut driver. Be sure
       to keep the screw; you'll use it in a later step to secure the
       DoubleTalk board in place.

    4. Hold the DoubleTalk board firmly at the top edges, and firmly press the
       gold connector into the expansion slot. Make sure the board is firmly
       seated in the slot with the gold connector fully inserted. The board
       will fit only one way in the slot.

    5. Using the screw removed in step 3, secure DoubleTalk in the computer by
       reinstalling the screw in the retaining bracket.

    6. Replace the computer's cover and plug in the power cord.

    7. Plug the supplied speaker into the jack in DoubleTalk's retaining
       bracket. Locate the volume control shaft (just above the speaker jack)
       and adjust it to about the mid point of its movement. Later, you may
       want to further fine tune the volume, but setting it at the midpoint now
       insures you don't accidentally attempt to use DoubleTalk with the volume
       turned all the way off.

    8. Turn on the computer and run the test program supplied on the DoubleTalk
       Utilities disk. Do this by inserting the disk in drive A: and typing the
       following DOS commands:

       A: <Enter> TEST <Enter>




  RC SYSTEMS                           - 3 -                    DOUBLETALK PC/LT







         NOTE  If you are running a screen reader program at the time the
               test program is run, the test may report that DoubleTalk
               couldn't be found. This is because the screen reader and
               test programs are "fighting" each other for control of
               DoubleTalk. Be sure to disable your screen reader software
               before running the above test, to avoid this situation.


    In the rare event that your DoubleTalk board does not pass the above test,
    re-check your work, making sure DoubleTalk is installed per the above
    instructions. Usually a mute DoubleTalk can be pinpointed to a silly
    mistake, such as the speaker not being plugged in, or the volume control on
    the card or speaker being turned all the way down.

    If you still cannot get any sound out of DoubleTalk after trying the above
    suggestions, try changing its port address by moving the small black
    plastic connector, located at the lower left edge of the DoubleTalk board,
    to a different pair of pins on the jumper block. When moving the connector,
    make sure it remains oriented from left to right, not up and down.
    DoubleTalk requires two adjacent I/O addresses in your computer; the
    hexadecimal numbers printed on the left side of the jumper block indicate
    the first ("base") address used when the black connector is placed in that
    position. (The I/O address is the only configurable aspect of DoubleTalk,
    since it doesn't use DMA or IRQ's. The factory-set address is 29Eh,
    configuring DoubleTalk to use addresses 29Eh and 29Fh.)

    As a last resort, try using another speaker, if one is available.


         HINT  If headphones are plugged into the speaker's headphone jack,
               the speaker will be muted to allow private listening through
               the headphones. The speaker's volume control can be used to
               adjust the listening level.


    If you are experiencing excessive noise coming through the headphones (all
    PCs generate some noise; some are worse than others), try the following:
    increase the volume by adjusting the volume control on the DoubleTalk card,
    and compensating by reducing the volume level with the speaker's volume
    control.


  DoubleTalk LT

    To set up DoubleTalk LT, follow these steps:

    1. Plug the cord that is attached to the back of DoubleTalk into a serial
       (COM) port in your computer.

    2. Plug the AC adapter that came with DoubleTalk into any convenient wall
       outlet. Firmly plug the cord from the AC adapter into the power jack at



  RC SYSTEMS                           - 4 -                    DOUBLETALK PC/LT






       the back of DoubleTalk. Don't be afraid to press the plug in hard - it's
       designed to be a tight fit!


         NOTE  DoubleTalk LT can also run from a 9 volt alkaline battery
               for periods of up to 10 hours or more, depending on usage
               habits, volume level, etc. If you remove the battery, be
               sure to replace the foam that was originally in the battery
               compartment, or undesirable resonances (vibrations) may
               occur during speech production. You may use DoubleTalk with
               the AC adapter even though a battery is installed; no
               battery energy will be expended as long as the adapter is
               plugged into the DoubleTalk unit.


    3. If you will be using headphones, plug them into the headphone jack in
       the front of DoubleTalk. (Note: The headphone jack is of the monaural
       type. A stereo/mono adapter must be used if you are using stereo
       headphones, or the sound will be heard from only one ear.)

    4. Turn the small black wheel in the front of DoubleTalk until you hear a
       small click. This is DoubleTalk's power switch and volume control.
       Shortly after turning the unit on, you should hear the words "DoubleTalk
       ready" come from the internal speaker or headphones. If you do not,
       check to make sure that the AC adapter is properly connected. If you are
       using headphones, try unplugging them and turn DoubleTalk's power off
       and back on. If you hear the power-on message from DoubleTalk's speaker
       now, you may have defective headphones (plugging headphones into the
       headphone jack mutes the internal speaker, to allow private listening).

    5. Turn on the computer and run the test program supplied on the DoubleTalk
       Utilities disk. Do this by inserting the disk in drive A: and typing the
       following DOS commands:

       A: <Enter> TEST <Enter>


         NOTE  If you are running a screen reader program at the time the
               test program is run, the test may report that DoubleTalk
               couldn't be found. This is because the screen reader and
               test programs are fighting each other for control of
               DoubleTalk. Be sure to disable your screen reader software
               before running the above test, to avoid this situation.



  Utilities Installation

    The Utilities disk includes an installation program for copying
    DoubleTalk's utility programs to your hard disk. If you would like to copy
    the utilities to your hard disk, type "A:INSTALL" and follow the
    instructions on the screen.



  RC SYSTEMS                           - 5 -                    DOUBLETALK PC/LT







         NOTE  The INSTALL program simply copies the utilities files to the
               directory you specify on your hard disk. None of your
               programs or setup information will be modified on your
               computer. Also, DoubleTalk's operation does NOT depend on
               the utility programs being copied to your hard disk.



  Windows 95/98 System Registration

    DoubleTalk does such a good job of being unobtrusive to your computer, that
    other hardware may not notice it, and render DoubleTalk inoperable. This is
    particularly true of Plug and Play devices.

    An information (INF) file is included in the DoubleTalk Utilities
    \DRIVERS\WIN95 directory, which will make Windows 95/98 "DoubleTalk aware."
    It is recommended that you install this file as soon as you install
    DoubleTalk in your system (it can even be installed beforehand, if you
    prefer). Here's how to do it:

    1. Open the "Add New Hardware" icon in the Windows Control Panel. This will
       bring up the Add New Hardware Wizard. Click "Next."

    2. The wizard should now be asking you if you want Windows to search for
       your new hardware. Click the "No" button, then "Next."

    3. In the Hardware types list box, click on "Sound, video and game
       controllers," then "Next."

    4. You are now shown lists of manufacturers and models. Click on the "Have
       Disk..." button.

    5. In the File name text box, type "A:\DRIVERS\WIN95" and click the "OK"
       button.

    6. Choose the type of DoubleTalk you have from the Models list box, then
       click "OK."

    7. Click the "Finish" button to install the file.

    If you have DoubleTalk PC and changed the port address jumper setting
    during installation, you will need to change the setting in System
    Properties:Device Manager:DoubleTalk PC:Resources accordingly.


  What's Next?

    Now that you have your DoubleTalk installed and have verified that it is
    working, you're probably wondering what software and/or drivers need to be
    installed. In most cases, the answer is none. Use the following checklist
    to help you determine what, if any, software needs to be installed from the
    Utilities disk.


  RC SYSTEMS                           - 6 -                    DOUBLETALK PC/LT






    1. I will be using DoubleTalk with a screen reader program other than IBM
       Screen Reader.

       Install and configure your screen reader for DoubleTalk. With the
       exception of IBM Screen Reader, all screen reader programs install their
       own DoubleTalk driver. These include ASAP, ASAW, JAWS, JAWS for Windows,
       Vocal Eyes, Window Eyes, Tiny Talk, and OpenBook. You do not need to
       install anything from the DoubleTalk Utilities.

    2. I will be using DoubleTalk with IBM Screen Reader.

       IBM Screen Reader does not directly support DoubleTalk - you must
       install the necessary drivers from the DoubleTalk Utilities disk. See
       "DoubleTalk Drivers/IBM Screen Reader," below, for installation
       instructions.

    3. I want to use DoubleTalk as a Windows sound card.

       In order for DoubleTalk to play sounds from Windows applications, the
       Windows sound driver must be installed. See "DoubleTalk Drivers/Windows
       sound driver," below.

    4. I want to be able to use DoubleTalk as a "talking printer" in DOS and
       Windows 3.1 applications.

       See "DoubleTalk Drivers/Talking printer," below.

    5. I want to use DoubleTalk with software written for the IBM Speech
       Adapter.

       See "DoubleTalk Drivers/IBM Speech Adapter emulator," below.

    6. I want to use DoubleTalk with programs published by Davidson.

       See "DoubleTalk Drivers/Davidson drivers," below.

    7. I want DoubleTalk to be able to speak in Spanish.

       See "Speaking Spanish," below.


  UTILITIES

    The Utilities disk that came with your DoubleTalk contains a number of
    useful and fun programs. They can be run directly from the floppy disk they
    came on, or from your hard disk (if you ran the INSTALL program during
    DoubleTalk's installation).


  Disk Contents

    The Utilities disk contains the following programs and files:



  RC SYSTEMS                           - 7 -                    DOUBLETALK PC/LT






    MANUAL.TXT     - This file
    INSTALL.COM    - Copies the utilities to your hard disk
    TEST.COM       - DoubleTalk test program
    DTINFO.COM     - Talking DoubleTalk statistics
    SMARTALK.EXE   - DoubleTalk demo program
    SMARTALK.HLP   - Help system file for SMARTALK.EXE
    WORDS1.LPC     - LPC data file for SmartTalk (male)
    WORDS2.LPC     - LPC data file for SmartTalk (female)
    *.PCM          - PCM/ADPCM data files for SmartTalk
    *.TGN          - Tone generator data files for SmartTalk
    SPANISH.EXA    - TTS Spanish dictionary for DTPRN.COM
    SPANISH.EXS    - TTS Spanish dictionary for SmartTalk
    SPANISH.BAT    - Batch program for changing to Spanish
    \DRIVERS       - Drivers for Windows, MS-Word, SSIL, etc.


  SmartTalk

    The SmartTalk program enables you to explore most of your new DoubleTalk's
    functions and features. To run SmartTalk, type

       SMARTALK <Enter>

    at the DOS prompt.

    You should be able to navigate around SmartTalk by following the help line
    at the bottom of the screen, and using the context-sensitive help available
    with the F1 key. SmartTalk works with a mouse or keyboard.

    The SmartTalk screen is made up of four distinct areas, or windows, which
    control the four major functions of DoubleTalk. Any one of these windows
    can be activated at a given time; the remaining three inactive windows are
    dimmed. A different window can be activated by clicking on it with the
    mouse, or using the PgUp and PgDn keys.

    The LPC window controls DoubleTalk's LPC synthesizer, the PCM window
    controls the PCM synthesizer, and so on. Inside each of these windows are
    various parameter fields, or "hotspots," so named because they are
    activated whenever they are clicked on with the mouse. Each of these fields
    performs a specific function, such as setting the text-to-speech
    synthesizer's speed or pitch, or loading a data file. If you don't have a
    mouse, you can select each field in turn by repeatedly pressing the Tab
    key. The Shift-Tab key combination works similarly, except it moves through
    the fields in the opposite direction.

    Each field also has a corresponding "hotkey," designated by the highlighted
    letter in the field's name. To select a field in this manner, press and
    hold the Alt key and the corresponding letter key; e.g., Alt+S selects the
    TTS synthesizer's Speed field; Alt+L loads a data file, and so on.

    After a field has been selected, its value can be changed in any of several
    different ways. If you have a mouse, pressing the right button will
    decrease the field's value; pressing the left button will increase its


  RC SYSTEMS                           - 8 -                    DOUBLETALK PC/LT






    value. If you prefer to use the keyboard, the right and left arrow keys can
    be used to increase and decrease the field's value in one-step increments;
    the up and down arrow keys do so in larger steps. To return to the text-
    entry box, press Enter or click anywhere inside the box.

    The F9 key will cause an Info box to be displayed, indicating how many LPC
    and PCM words and sounds are currently loaded in memory, as well as PCM
    encoding type, etc. The F7 key temporarily suspends SmartTalk and returns
    you to DOS, without quitting SmartTalk. You may use any DOS commands while
    in this mode. The F10 (or Esc) key exits SmartTalk.

    The four SmartTalk function windows, TTS, LPC, PCM and TGN, are described
    next.


  TTS

    This window gives you access to DoubleTalk's text-to-speech synthesizer.
    You can enter any word or phrase you wish and change any of the voice
    parameters by modifying the corresponding parameter field directly, or by
    typing the equivalent commands in the text-entry box. A special "View" mode
    can be activated with the Mode field, enabling you to actually see the
    phonemes DoubleTalk used to speak the text in the text-entry box. This can
    be a valuable tool in choosing the correct phonemes during the creation of
    an exception dictionary (described in the Developer's Tools).


  LPC

    The LPC window activates DoubleTalk's LPC synthesizer. Two sample LPC data
    files, WORDS1 and WORDS2, are supplied. A list of the words contained in
    these files can be found in Appendix A. DoubleTalk supports 5220 and D6
    LPC-10 data formats and two speeds of playback. The largest data file that
    can be loaded is 32K.


  PCM

    This window allows you to play back digitized sounds which have either PCM
    or ADPCM encoding. A number of sample data files are included on the disk.
    You can manipulate the playback sampling rate with the Rate field (note
    that by default, the sampling rate is automatically set to the rate at
    which the sounds were originally recorded). The volume is controlled by the
    TTS synthesizer's volume parameter (in the TTS window). The largest data
    file that can be loaded is 256KB.


  TGN

    This window activates DoubleTalk's musical tone generators. Simply load one
    of the sample tone generator data files from the disk and press the Play
    button. Press the Cancel button to cancel the playback at anytime. The



  RC SYSTEMS                           - 9 -                    DOUBLETALK PC/LT






    largest data file that can be loaded is 16K. DoubleTalk's sinusoidal
    generators are not accessible through this window.


  DoubleTalk Drivers

    The \DRIVERS directory of the Utilities disk contains files which enable
    DoubleTalk to operate with a number of programs. These include a "talking
    printer" driver, which enables DoubleTalk to read text from your favorite
    word processor or text editor; a Windows "Wave" driver, which brings your
    Windows-based programs alive with sound; and others more specific to
    certain application programs that you may have.


  Talking printer

    DTPRN.COM is a resident (TSR) program that enables your programs to access
    DoubleTalk's TTS synthesizer as a printer (LPT1 - LPT3) or communications
    port (COM1 - COM4). This enables most DOS and Windows-based programs (such
    as word processors) and programming languages to communicate with
    DoubleTalk by simply "printing" the text to be spoken to the port. DTPRN
    requires only 700 bytes of memory, and can be loaded into upper memory on
    machines supporting this feature using the DOS LOADHIGH command.


         NOTE  DTPRN will not work with native Windows 95/98 applications.
               It only works in a Windows 95/98 DOS shell, Windows 3.1, and
               standard DOS environments. A version of DTPRN which works
               with native Windows 95/98 applications is available for use
               with the DoubleTalk PC; contact RC Systems for details.


  Installing DTPRN

    DTPRN is invoked from the DOS command line by typing the command

       DRIVERS\DTPRN <port> [/N] [/Cx] [/R]

    where <port> is one of the seven system ports LPT1 thru LPT3 or COM1 thru
    COM4. For example, DTPRN can be installed as LPT2 by typing

       DRIVERS\DTPRN LPT2 (or LPT2:)

    If no port specification is given, DTPRN will install as LPT3. During
    installation, DTPRN will initialize DoubleTalk; if DoubleTalk cannot be
    located in the computer, DTPRN will abort the installation procedure and
    notify you as such.

    If an error occurs during the installation of DTPRN, such as the use of an
    invalid port name, DoubleTalk wasn't found, or DTPRN is already resident,
    an error code is returned to the program that invoked DTPRN. This code can
    be processed in a batch program using the IF ERRORLEVEL command, so



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    appropriate action can be taken. The following is a summary of the return
    codes returned by DTPRN:

       0  DTPRN was successfully installed (no errors).
       1  DTPRN is already resident.
       2  An invalid port name was specified.
       3  Too many or invalid parameter(s) (DTPRN still loads).
       4  Incompatible version of DOS (must be 2.0 or later).
       5  DoubleTalk could not be located.

    During operation, DTPRN intercepts the appropriate BIOS software interrupt
    vector (14h for COM ports or 17h for LPT ports). Therefore, programs that
    bypass the BIOS interrupts by accessing the port's hardware directly (as
    some terminal programs do) will not speak, since DoubleTalk will never
    receive the output characters.

  Disabling DoubleTalk's buffer

    The optional command line switch /N is used to disable DoubleTalk's text
    buffer. This can be beneficial in applications where it is important that
    the voice stay synchronized with the text being read from the screen.

  Removing DTPRN from memory

    DTPRN can be removed from memory by typing

       DRIVERS\DTPRN /R

    Removing DTPRN from memory frees the 1000 or so bytes of RAM that it uses,
    as well as allow the printer or communications port assigned to DTPRN to
    function normally again.

  Sending text and commands

    Any combination of text and commands can be sent to DoubleTalk via DTPRN.
    Note, however, that DoubleTalk will not begin speaking until it receives at
    least one Carriage Return (0Dh) or Null (00h), except when in Character
    mode. Additional text may be sent while DoubleTalk is speaking.

    A special feature of DTPRN is the way in which it handles DoubleTalk
    commands. DoubleTalk itself accepts only a control character for its
    command character (^A by default - see "Commands," below), which can be
    somewhat difficult, if not impossible, to enter in some applications, such
    as a word processor. For this reason, DTPRN has been designed to also
    accept an asterisk (*) as the command character, besides the standard ^A
    character. A so-called "asterisk command" must be followed by an
    alphanumeric character, '+', '-', or '@' to be considered a valid command
    by DTPRN. Examples of valid asterisk commands are:

       *8s *3F *+10P

    If the text being read contains asterisk characters, you may find
    DoubleTalk's voice changing unexpectedly, if the characters following an


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    asterisk evaluate to a valid command. For this reason, DTPRN allows you to
    change its command character to any other printing character, with the
    optional /Cx command line switch. For example, /C& changes the command
    character from '*' to '&'. To disable DTPRN's command recognition
    altogether, use /C by itself. For example,

       DRIVERS\DTPRN LPT1 /N /C

    installs DTPRN as LPT1, with the buffer and command recognition both
    disabled. Note that even when DTPRN's command character has been changed
    (or disabled), commands can still be issued to DoubleTalk using
    DoubleTalk's command character (^A).

  Stopping speech production

    You can momentarily silence DoubleTalk by pressing the left and right Shift
    keys simultaneously. Keep in mind, however, that this action will not
    terminate the file being printed to DoubleTalk - you must stop the
    "printing" of the file from the application program (usually by pressing
    the Escape key or Control-C). Pressing the Shift keys only purges the text
    currently in DoubleTalk's input buffer.


  Word 5.0 talking printer

    The SPEECH.PRD file is a printer definition file for turning DoubleTalk
    into a versatile "talking printer" with Microsoft Word 5.0. Simply copy the
    SPEECH.PRD file to your Word directory, and a new printer named "SPEECH"
    will appear in Word's Print Options printer list.


         NOTE  The printer emulator DTPRN (described in an earlier section)
               must be installed in order for Word (or any other word
               processor, for that matter) to read its files through
               DoubleTalk. We recommend that you install DTPRN as port
               LPT3, so as not to interfere with your "real" printer.


    When selecting the SPEECH printer in Word, make sure you choose the same
    port that DTPRN is using (LPT3, if you followed the suggestion given above)
    in Word's Printer Options setup.

    When you print a document to the SPEECH printer, DoubleTalk always begins
    speaking with the voice parameters set to the following values:

       Fmt Freq = 5
       Pitch = 50
       Speed = 5
       Dictionary = Disabled

    The SPEECH printer also recognizes seven font attributes and acts upon them
    as shown in the following table:



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       Font Attribute   Voice Change
       -------------------------------
       Underline        Low volume
       Dbl underline    High volume
       Strike thru      Low pitch
       Italics          High pitch
       Subscript        Slow speed
       Superscript      Fast speed
       Bold             Use dictionary


    The reason a command was included to use or not use DoubleTalk's exception
    dictionary ("Bold" attribute) is to enable you to use foreign languages, as
    well as English, in your documents. This has proven to be of great
    potential in classroom environments, where the teacher is able to set up
    talking foreign language lessons containing both English and foreign words
    and phrases. To set up such a system for Spanish and English, for example,
    follow these steps:

    1. Run DTPRN.COM.

    2. Load the Spanish dictionary SPANISH.EXA into DoubleTalk.

    3. Run Word.

    This procedure can be automated by creating a batch file similar to the
    following:

       @echo off
       drivers\dtprn
       if errorlevel 2 goto Exit
       type spanish.exa > lpt3
       word
       :Exit

    DoubleTalk/DTPRN "asterisk" commands, described in the section above, can
    also be used with the SPEECH printer.


  IBM Speech Adapter emulator

    INT4DAPI.COM is a small TSR program which enables you to use DoubleTalk
    with a number of talking educational software programs, designed to work
    with IBM's Speech Adapter. To install it, simply type INT4DAPI at the DOS
    prompt. Note that INT4DAPI must be installed prior to running the talking
    software.

    INT4DAPI can be removed from memory by typing

       INT4DAPI /R

    Software that has been tested and known to work with INT4DAPI is IBM's
    Bouncy Bee Learns Letters, Bouncy Bee Learns Words, Writing to Read, and


  RC SYSTEMS                           - 13 -                   DOUBLETALK PC/LT






    Hartley Courseware's Project Star and Brick by Brick series. Not tested,
    but "probables," are IBM's Measurement, Time & Money and Hartley's Money
    Series.


  IBM Screen Reader

    The files in the IBMSRD subdirectory enable DoubleTalk to work with the DOS
    IBM Screen Reader program. After installing the Screen Reader (choose any
    synthesizer when prompted), copy the appropriate files to the Screen Reader
    directory, as follows:

    DoubleTalk PC:

       SRDPROG.EXE (Screen Reader version 1.1 ONLY!!)
       DTPCASYN.EXE (rename as SRDASYNC.EXE after copying)
       DTPC.TTS (rename as SRD.TTS after copying)

    DoubleTalk LT:

       SRDPROG.EXE (Screen Reader version 1.1 ONLY!!)
       DTLTASYN.EXE (rename as SRDASYNC.EXE after copying)
       DTLT.TTS (rename as SRD.TTS after copying)

    An installation program, SRDINST.BAT, is included in the IBMSRD
    subdirectory which will copy the necessary files for you, automating the
    above process. To use the installation program, type

       A: <Enter>
       CD \DRIVERS\IBMSRD <Enter>
       INSTALL [type] [path] <Enter>

    where [type] is the synthesizer type (pc or lt), and [path] is the
    drive/directory of where your Screen Reader software is installed. For
    example,

       INSTALL LT C:\SRD12 <Enter>

    will install the DoubleTalk LT driver in directory \SRD12 on drive C:.

    Screen Reader version 1.1 has a bug in the program file SRDPROG.EXE, which
    degrades Screen Reader's performance with DoubleTalk. This file should be
    replaced with the SRDPROG.EXE file, included in the IBMSRD directory, but
    ONLY if you have Screen Reader version 1.1. The bug was fixed in Screen
    Reader version 1.2. Do NOT replace the SRDPROG.EXE file shipped with
    version 1.2, or the program will become non-functional! The INSTALL program
    will update this file for you automatically, if appropriate.

    If you are setting up Screen Reader for use with the DoubleTalk LT, note
    that it will initially be set up for port COM1. If your DoubleTalk LT is
    connected to a port other than COM1, you must change Screen Reader's port
    setting with the SRDUTIL utility program.



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    The following Special codes have been included in the DTPC.TTS and DTLT.TTS
    files:

       AA1 - Disable exception dictionary
       AA2 - Enable exception dictionary
       AA3 - Bass
       AA4 - Treble
       AA5 - Formant frequency "3"
       AA6 - Formant frequency "5" (normal)
       AA7 - Formant frequency "7"
       AA8 - Monotone (no intonation)
       AA9 - Inflected (automatic intonation)

    Note that Special codes 1 and 2 may be used to switch between English (code
    1) and a foreign language (code 2), such as Spanish. Of course, you may re-
    assign any DoubleTalk commands you wish to the Special codes using the
    SRDUTIL program that came with your Screen Reader.

    When Screen Reader initially loads, it looks in the current directory for a
    user exception dictionary named SRD.EXA. If the file exists, it is
    automatically loaded into DoubleTalk. (This is the easiest way to make
    Screen Reader speak in a foreign language; to speak in Spanish, for
    example, simply copy the SPANISH.EXA file to your Screen Reader directory,
    and rename it SRD.EXA.) It is not necessary that the dictionary be present
    for Screen Reader to function.


  SSIL driver

    A number of Windows-based screen readers and scanning programs use what is
    known as the "Speech Synthesizer Interface Library," or SSIL, standard.
    When you install one of these programs on your computer, the appropriate
    DoubleTalk SSIL driver is installed with the program. An Open Book Unbound,
    ASAW and JAWS for Windows are examples of such programs.

    The files in the SSIL subdirectory are meant to replace the older SSIL
    DoubleTalk drivers, which probably came with your program. They correct
    some bugs in the older drivers, and add new functionality. To update your
    drivers, perform the following steps:

    1. Copy the two files from the Utilities disk SSIL subdirectory, SSIL.INI
       and DUBLTALK.DLL, to your Windows directory (usually, C:\WINDOWS). If
       you have DoubleTalk PC, you're done. If you have DoubleTalk LT, proceed
       to step 2.

    2. Using any text editor (or word processor that can save files as standard
       text, or ASCII, files), load the SSIL.INI file from your Windows
       directory.

    3. Note the following three lines in the beginning of the file:





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       [SSIL]
       Device=DoubleTalk
       Port=Internal

       The "Port" entry tells the SSIL driver how your DoubleTalk is connected
       to the computer. If this entry is not set correctly, it will very likely
       cause your computer to "hang" when the driver is used. The default
       setting is for the DoubleTalk PC (Port=Internal). If you have a
       DoubleTalk LT, change the Port entry to the port DoubleTalk is connected
       to: COM1, COM2, COM3, or COM4. For example,

       [SSIL]
       Device=DoubleTalk
       Port=com1

       will properly configure the driver for DoubleTalk LT connected to COM
       port 1. Case is not significant; COM1 is the same as com1, as far as the
       driver is concerned. Be sure to save the modified file, if you made any
       changes!


  Davidson drivers

    The two drivers in the DAVIDSON subdirectory enable DoubleTalk PC to work
    with DOS-based programs from Davidson. For Windows-based Davidson programs,
    use the Windows driver in the WINDOWS subdirectory.

    When installing the Davidson software for use with DoubleTalk PC, choose
    any one of the supported sound devices in the installation program. (If you
    want to follow the examples in the following steps, choose the Covox
    driver.) Then, follow these steps:

    1. Locate the batch file used for starting the program, in the directory of
       your hard disk that the program was installed. The file name will be the
       same name you type to start the program, with a .BAT extension. For
       example, the correct batch file for Zoo Keeper is ZOOKEEP.BAT.

    2. Using any text editor (such as EDIT that comes with DOS), load the batch
       file located in step 1, and locate the line that loads the sound driver.
       This is usually the second or third line, and contains the word SOUND???
       (??? = three letters dependent on driver chosen during installation). If
       you chose the Covox driver when you installed the program, you will find
       a line that says either "\DRIVERS\SOUNDCVX" or simply "SOUNDCVX."

    3. Okay, you've made it this far. Now here's the tricky part (!!!). In
       March 1993, Davidson changed the way their programs work with sound
       drivers, due to a conflict with Sony CD-ROM drives. This made it
       necessary for us to supply two versions of essentially the same driver,
       SOUNDDBL.EXE (for post-March '93 program releases), and SOUNDDBT.EXE
       (pre-March '93).

       What you've got to do now is take your best guess as to which of the two
       drivers will make your Davidson program happy, and change the name of


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       the driver located in step 2 to SOUNDDBL or SOUNDDBT, as well as copy
       the corresponding driver from the DoubleTalk Utilities disk to the
       directory of drivers in the Davidson program. If you choose the wrong
       one, you simply won't get any sound through DoubleTalk. In this case,
       install the other driver and try again. (Another clue that you gambled
       wrong is, if you see the message "No sound driver loaded" when quitting
       the program.)

    Of the five DOS-based Davidson programs we found in our archives, we found
    Reading Adventures in Oz and Zoo Keeper to work with SOUNDDBT.EXE.
    Likewise, SOUNDDBL.EXE worked with Word Attack 3, Spell It 3 and Kid Keys.


  Windows sound driver

    The Windows sound driver located in the WAVE subdirectory enables
    DoubleTalk to play Wave (.WAV) files from Windows-based applications. When
    the driver has been installed, your DoubleTalk PC or LT will be compliant
    with Windows programs supporting sound.

    Follow these steps to install the sound driver:

  Windows 3.1

    1. Open the "Drivers" icon in the Windows Control Panel.

    2. Inside the Drivers window, click the "Add" button and choose "Unlisted
       or Updated Driver."

    3. In the text box, type "A:\DRIVERS\WAVE" and click the "OK" button. If
       your Utilities disk is in a drive other than A:, substitute the
       appropriate drive letter.

    4. Click the "OK" button to install the driver.

    5. Configure the driver for your DoubleTalk, per the instructions below.

  Windows 95

    1. Open the "Add New Hardware" icon in the Windows Control Panel. This will
       bring up the Add New Hardware Wizard. Click "Next."

    2. The wizard should now be asking you if you want Windows to search for
       your new hardware. Click the "No" button, then "Next."

    3. In the Hardware types list box, click on "Sound, video and game
       controllers," then "Next."

    4. You are now shown lists of manufacturers and models. Click on the "Have
       Disk..." button.





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    5. In the File name text box, type "A:\DRIVERS\WAVE" and click the "OK"
       button. If your Utilities disk is in a drive other than A:, substitute
       the appropriate drive letter.

    6. Confirm that "RC Systems DoubleTalk Wave" is displaying in the Models
       list box, then click "OK."

    7. Click the "Finish" button to install the driver.

  Configuring the sound driver

    Immediately after installing the sound driver, a setup dialog box will
    appear. The left half of the box lists the six possible I/O addresses for
    the DoubleTalk PC; the right half lists the possible COM ports for
    DoubleTalk LT. Check the appropriate box for your DoubleTalk (29E is the
    factory default for DoubleTalk PC). This setting can be changed later, if
    necessary, using the "Drivers" icon in the Windows 3.1 Control Panel, or
    the "Multimedia" icon in Windows 95.

    Note that performance is somewhat limited with the DoubleTalk LT, since all
    of the digital sound data must be pumped out your computer's serial port
    (not a very efficient arrangement, but it works!).


  Speaking Spanish

    Teaching DoubleTalk how to speak in Spanish is quite simple. A special
    exception dictionary, defining the letter-to-sound rules for the Spanish
    language, is included on the Utilities disk.

    The Spanish dictionary is provided in the file named SPANISH.EXA, which
    need only be loaded into DoubleTalk. How it actually gets loaded varies,
    depending on the program that will be using it. The batch file SPANISH.BAT
    is designed to automate the procedure by running the DTPRN program,
    transferring SPANISH.EXA to DoubleTalk, and finally removing DTPRN from
    memory. To run SPANISH.BAT, type

       SPANISH <Enter>


         NOTE  If a screen reader program is used with the Spanish
               dictionary, be sure to start the screen reader first, before
               running SPANISH.BAT. Otherwise, the screen reader will purge
               the dictionary when it initializes DoubleTalk.


    Keep in mind that when the Spanish dictionary is loaded into DoubleTalk and
    enabled, DoubleTalk will apply Spanish rules of pronunciation to all text
    it receives, regardless of whether the text is actually Spanish or not. Use
    the Text mode command (*T) to switch to the normal English pronunciation
    rules built into DoubleTalk, and the Enable Exceptions (*U) command to
    switch back to Spanish.



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  Configuring SSIL-based screen readers for Spanish

    Windows screen reader programs utilizing the SSIL standard can be easily
    adapted to Spanish:

    1. Locate the screen reader's SSIL.INI file (usually C:\WINDOWS\SSIL.INI).

    2. Using any text editor (or word processor that can save files as standard
       text, or ASCII, files), load the SSIL.INI file.

    3. Note the following line near the beginning of the file:

       Dictionary=none

       The "Dictionary" entry tells the SSIL driver which DoubleTalk dictionary
       to load during startup. Enter the complete pathname of where the
       SPANISH.EXA file is located. For example, if you installed the
       DoubleTalk Utilities in the default location on drive C:, the entry
       should look like:

       Dictionary=c:\dt\spanish.exa

    4. Save the SSIL.INI file back to disk.


  OPERATIONAL DESCRIPTION

    This section describes the operational characteristics of DoubleTalk. Since
    this is somewhat technical in nature and is not necessary to successfully
    use DoubleTalk, you may wish to stop reading here.


  TTS Operating Modes

    DoubleTalk's TTS synthesizer has three operating modes which determine how
    text is processed by the internal algorithms. These modes are the Text,
    Character and Phoneme modes, treated separately in the following
    paragraphs. The operating mode can be changed anytime, even within the same
    string of text.


         NOTE  The operation of DoubleTalk's LPC, PCM and CVSD synthesizers
               are not discussed here, as they are technical in nature and
               require some programming skills to be used effectively.
               Obtain the Developer's Tools disk if you require more
               information about these DoubleTalk functions.


    In the text-to-speech operating modes, DoubleTalk does not make any
    distinction between uppercase and lowercase characters. Text and commands
    may be sent as all uppercase, all lowercase, or any combination thereof.




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  Text mode

    In this mode, all text sent to DoubleTalk are spoken as complete sentences.
    Punctuation is also taken into consideration by the intonation generation
    algorithms. DoubleTalk will not begin speaking until it receives a CR (0Dh)
    or Null (00h) character-this ensures that sentence boundaries receive the
    proper inflection. This is the default operating mode.


  Character mode

    This mode causes DoubleTalk to translate input text on a character-by-
    character basis; i.e., text will be spelled instead of spoken as words.
    DoubleTalk does not wait for a CR/Null in this mode.


  Phoneme mode

    This mode disables DoubleTalk's text-to-phonetics translator, allowing
    DoubleTalk's phonemes to be directly accessed. Phonemes in the input buffer
    will not be spoken until a CR or Null is received.


  Translation Accuracy

    Because DoubleTalk must handle the highly irregular spelling system of
    English, as well as proper names, acronyms, technical terms, and borrowed
    foreign words, there inevitably will be words that it will mispronounce. If
    a word is mispronounced in your application, there are three techniques
    available to you for correcting it:

    1. Respell the word for the desired pronunciation.

    2. Redefine the way the word should be pronounced by creating an exception
       for it in DoubleTalk's exception dictionary. This method allows words to
       be corrected without having to modify the original text, and it
       automatically corrects all instances of the word.

    3. Use DoubleTalk's Phoneme mode.

    The first technique is the easiest way to fine tune word pronunciations -
    by tricking DoubleTalk into the desired pronunciation. Among the more
    commonly mispronounced words are compound words (baseball), proper names
    (Sean), and foreign loan words (chauffeur). Compound words can usually be
    corrected by separating the two words with a space, so that "baseball"
    becomes "base ball." Proper names and foreign words may require a bit more
    creativity, so that "Sean" becomes "Shon," and "chauffeur" becomes "show
    fur." Heteronyms (words with identical spelling but different meanings and
    pronunciations) can also be modified using this technique. For example, if
    the word "read" is to be pronounced as "reed" instead of "red," respell it
    "reed."




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  Commands

    The commands described in the following pages provide a simple means of
    controlling DoubleTalk under software control. They can be used to vary
    voice attributes, such as the speed or pitch, to suit the requirements of a
    particular application or your listening preferences. Commands are also
    used to change operating modes.

    Commands can be freely intermixed with the text that is to be spoken,
    allowing the voice to be dynamically controlled. Commands affect only the
    text that follows them in the text stream.


         NOTE  DoubleTalk commands can generally be used only with
               application programs that you write yourself. This is
               because most programs prevent the commands from reaching
               DoubleTalk, virtually becoming a brick wall between you and
               DoubleTalk. Many talking programs, however, usually provide
               an indirect means of changing DoubleTalk's attributes via
               some sort of voice menu or command system.


    This restriction does not apply, however, if you are printing files from a
    program to DoubleTalk via DTPRN. Although DTPRN is essentially a program
    capable of blocking commands, it was specifically written to pass commands
    on to DoubleTalk. Furthermore, DTPRN enables you to use an asterisk (*) or
    other user-defined character as the command character, besides Control-A
    (see discussion below).


  Command formats

    All DoubleTalk commands are composed of the command character, a one or
    two-digit ASCII parameter n, and an ASCII character which uniquely
    identifies the command. Some commands simply enable or disable a feature of
    DoubleTalk; these commands do not require a parameter. The command formats
    is:

       <command character><n><letter>


  The command character

    The default DoubleTalk command character is Control-A (01h). The command
    character itself can be spoken by DoubleTalk by sending it twice in a row:
    Control-A Control-A. This special command allows the command character to
    be spoken without affecting the operation of DoubleTalk, and without having
    to change to another command character and then back again.

  Changing the command character

    The command character can be changed to another control character (01h-1Ah)
    by sending the current command character, followed by the new character. To


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    change the command character to Control-D, for example, issue the command
    Control-A Control-D. To change it back, issue the command Control-D
    Control-A. It's generally a good idea to change the command character if
    the forthcoming text contains characters which may otherwise be interpreted
    as command characters (and hence commands).

    The command character can be unconditionally reset to Control-A by sending
    Control-^ (1Eh) to DoubleTalk while operating in the Text, Character, or
    Phoneme modes.


  Command parameters

    Command parameters are composed of one or two-digit ASCII numbers.
    DoubleTalk supports two types of parameters: absolute and relative.
    Absolute parameters explicitly specify the parameter's new value, such as
    9S or 3B. Relative parameters specify a displacement from a parameter's
    current value, not the actual new value itself.

    Relative parameters can specify either a positive or negative displacement
    from a parameter's current value. For example, the Volume command +2V
    increases the current volume by two (V + 2 -> V).

    If the current volume is 4, it will increase to 6 after the command has
    executed. The command -2V will have a similar effect, except the volume
    will be decreased by two.

    If the value of a parameter falls outside the command's range, the value
    will wrap around, instead of being truncated. For example, if the current
    volume is 7 and the command +4V is issued, the resultant volume will be (7
    + 4) - 10, or 1, since the volume range is 0-9.

    When writing application programs for DoubleTalk, it is recommended that
    relative parameters be used for temporarily changing voice attributes (such
    as raising the pitch of a word), using absolute-parameter commands only
    once in the program's initialization routine. This way, if the base value
    of an attribute must be changed, it only needs to be changed in the
    initialization routine.


  Command Descriptions

    This section describes the software commands supported by DoubleTalk. With
    the exception of the Volume command, these commands only affect the text-
    to-speech synthesizer.


  Voice (nO)

    DoubleTalk's TTS synthesizer has eight standard voices to choose from, as
    well as a number of individual voice controls that can be used to
    independently vary the voice characteristics. The Voice command enables
    DoubleTalk's voice to be changed anytime, such as for identifying text


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    attributes (italics, bold, underline, etc.). Voices are selected with the
    commands 0O through 7O, as shown in Table 1. Note that because this command
    alters numerous internal voice parameters (pitch, tone, etc.), it should
    precede any individual voice parameter commands.

       n       Voice Name
       --------------------
       0       Perfect Paul
       1       Vader
       2       Big Bob
       3       Precise Pete
       4       Ricochet
       5       Biff
       6       Skip
       7       Robo Robert

    Table 1. Voice Selections

    Some programs, such as screen readers for the blind, often send voice
    control commands (such as pitch) to DoubleTalk. This can change the way a
    voice sounds, or even completely negate any voice change you might make. If
    this happens with your screen reader, try adjusting its pitch command to
    restore the desired voice (some screen readers allow you to do this
    permanently by editing one of its parameter files - check your screen
    reader documentation for details).


  Articulation (nA)

    This command adjusts the articulation level, from 0A through 9A.
    Excessively low articulation values tend to make the voice sound slurred;
    very high values, on the other hand, can make the voice sound choppy. In
    general, the articulation should be increased as the speed (nS) is
    increased. The default articulation is 5A.


  Expression (E/nE)

    Expression, or intonation, is the variation of pitch within a sentence or
    phrase. When expression is enabled (n > 0), DoubleTalk attempts to mimic
    the pitch patterns of human speech. For example, when a sentence ends with
    a period, the pitch drops at the end of the sentence; a question mark will
    cause the pitch to rise.

    The optional parameter n determines the degree of intonation. 0E provides
    no intonation (monotone), whereas 9E is very animated sounding. 5E is the
    default setting. If the parameter is omitted, the current (last set) value
    will be used. This is useful for re- enabling intonation after a Monotone
    command.






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  Monotone (M)

    This command disables all intonation (expression), causing DoubleTalk to
    speak in a monotonic voice. Intonation should be disabled whenever manual
    intonation is applied using the Pitch command or phoneme attribute tokens.
    Note that this command is equivalent to the 0E command.


  Formant Frequency (nF)

    This command adjusts the synthesizer's overall frequency response (vocal
    tract formant frequencies), over the range 0F through 9F. By varying the
    frequency, voice quality can be fine-tuned or voice type changed. The
    default frequency is 5F.


  Speed (nS)

    The synthesizer's overall rate (speed) of speech can be adjusted with this
    command, from 0S (slowest) through 9S (fastest). The default speed is 5S.


  Pitch (nP)

    This command varies the synthesizer's pitch over a wide range, which can be
    used to change the average pitch during speech production, produce manual
    intonation, or create sound effects (including singing). Pitch values can
    range from 0P through 99P; the default is 50P.


  Volume (nV)

    This command controls the synthesizer's volume level, from 0V through 9V.
    0V yields the lowest possible volume; maximum volume is attained at 9V. The
    default volume is 5V. The Volume command can be used to set a new listening
    level or create emphasis in speech. PCM mode and the sinusoidal/DTMF
    generators are also affected by this command.


  Tone (nX)

    The synthesizer supports three tone settings, bass (0X), normal (1X), and
    treble (2X), which work much like the bass and treble controls on a stereo.
    The best setting to use depends on the speaker being used and personal
    preference. Normal (1X) is the default setting.


  Reverb (nR)

    This command is used to add reverberation to the voice. 0R (the default)
    introduces no reverb; increasing values of n correspondingly increase the
    reverb delay and effect. 9R is the maximum setting.



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  Punctuation Filter (nB)

    Depending on the application, it may be desirable to limit the reading of
    certain punctuation. For example, if DoubleTalk is used to proofread
    documents, the application may call for only unusual punctuation to be
    read. On the other hand, an application which orally echoes keyboard
    entries on a computer for a blind user may require that all punctuation be
    spoken.

    DoubleTalk supports four primary levels of punctuation filtering, as shown
    in Table 2. Besides determining which punctuation characters will be spoken
    and which will not, the punctuation filter also determines how number
    strings will be read.

       n       Punctuation Spoken
       ------------------------------------
       0       All
       1       Most (all but CR, LF, Space)
       2       Some ($%&#@=+*^<>|\)
       3       None

    Table 2. Base Punctuation Settings

    The values of n listed in the table cause number strings to be read a digit
    at a time (e.g., 0123 = "zero one two three"). Adding 4 to these values (n
    = 4-7) causes number strings to be read as numbers (0123 = "one hundred
    twenty three"). N = 6 and 7 also cause currency strings to be read as they
    are normally spoken - for example, $11.95 is read as "eleven dollars and
    ninety five cents." Finally, adding 8 to these values (n = 8-15) disables
    leading zero suppression; number strings beginning with zero will always be
    read a digit at a time.

    The default filter setting is 6B (Some punctuation, Numbers mode, leading
    zero suppression on).


  Timeout Delay (nY)

    The Text and Phoneme modes of DoubleTalk defer translating the contents of
    the input buffer until a CR or Null is received. This ensures that text is
    spoken smoothly from word to word, and that the proper intonation is given
    to the beginnings and endings of sentences. If text is sent to DoubleTalk
    without a CR or Null, it will remain untranslated in the input buffer
    indefinitely.

    DoubleTalk contains a programmable timer which will force it to translate
    its buffer contents after a predetermined time interval. The timer is
    enabled only if the Timeout parameter n is non-zero, DoubleTalk is not
    active (not talking), and the input buffer contains no CR or Null
    characters. Any characters sent to DoubleTalk before timeout will
    automatically restart the timer.




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    The Timeout parameter n specifies the number of 200 millisecond (0.2 sec)
    periods in the delay time, which can range from 200 milliseconds to 3
    seconds (Table 3). The default value is 0, which disables the timer.

       n       Delay
       -------------------------------------
       0       Indefinite (wait for CR/Null)
       1       200 milliseconds
       2       400 milliseconds
       .       .
       .       .
       15      3000 milliseconds (3 sec.)

    Table 3. Timeout Delays


  Load Exceptions (L)

    This command purges DoubleTalk's exception dictionary and stores subsequent
    output from the host in DoubleTalk's exception dictionary RAM. Because the
    memory used by the dictionary is the same physical RAM used by the input
    buffer, the space available for the input buffer is decreased
    proportionally by the size of the dictionary.

    The dictionary can be purged from DoubleTalk with the Reinitialize command,
    or by loading a "null" dictionary file into DoubleTalk. Both methods
    reallocate the memory space occupied by the dictionary to the input buffer.

    Exception files must be compiled into the internal format used by
    DoubleTalk before they can be used. A compiler program is included on the
    Developer's Tools disk for performing this task.

    The topic of writing exception dictionaries is somewhat complex for the
    average (sane) user, and is therefore left to the Developer's Tools.


  Enable Exceptions (U)

    The exception dictionary is enabled with this command. If DoubleTalk is in
    Phoneme mode, or if an exception dictionary has not been loaded, the
    command will have no effect. The exception dictionary can be disabled by
    issuing one of the mode commands D, T, or C.


  Reinitialize (@)

    This command clears the input buffer (see "Clear" command) and restores all
    of the voice parameters to their default settings. The exception dictionary
    memory is also cleared and reallocated to the input buffer.






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  Zap Commands (Z)

    This command prevents DoubleTalk from honoring subsequent commands,
    enabling it to read commands as they are issued. Any pending commands in
    the input buffer will still be honored. The only way to restore command
    recognition after the Zap command has been issued is to write Control-^
    (1Eh) or perform a hardware reset.


  DTMF Generator (n*)

    The DTMF (Touch-Tone) generator generates the 16 standard tone pairs
    commonly used in telephone systems. Each tone pair generated by DoubleTalk
    is 100 ms in duration, more than satisfying the telephone signaling
    requirements (this can be extended to 500 ms with the Protocol Options
    command). The mapping of the command parameter n to the buttons on a
    telephone is shown in Table 4.

    The "pause" tone is used to generate the inter-digit delay in phone number
    strings. The generator's output level can be adjusted with the Volume (nV)
    command. DTMF commands are buffered, and can be intermixed with text for
    the TTS synthesizer without restriction.

       n       Button
       -------------------
       0       0 (default)
       .       .
       .       .
       9       9
       10      *
       11      #
       12      A
       13      B
       14      C
       15      D
       16      pause

    Table 4. DTMF Generator


  Tone Generators (J/nJ)

    DoubleTalk's tone generators are activated with these commands. The
    operation of the tone generators are beyond the scope of this manual, but
    are described in detail in the Developer's Tools.


  Text Mode/Delay (T/nT)

    This command places DoubleTalk in the Text operating mode. The optional
    delay parameter n is used to create a variable pause between words. The
    shortest, and default delay of 0, is used for normal speech. For users not
    accustomed to synthetic speech, the synthesizer's intelligibility may be


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    improved by introducing a delay. The longest delay that can be specified is
    15. If the delay parameter is omitted, the current (last set) value will be
    used and the exception dictionary will be disabled. This feature is useful
    for returning from another operating mode or disabling the exception
    dictionary (see "Enable Exceptions" command).


  Character Mode/Delay (C/nC)

    This command puts DoubleTalk in the Character operating mode. The optional
    delay parameter n is used to create a variable pause between characters.
    Values between 0 (the default) and 15 provide pauses from shortest to
    longest, respectively. Values between 16 and 31 provide the same range of
    pauses, but control characters will not be spoken. If the delay parameter
    is omitted, the current value will be used and the exception dictionary
    will be disabled.


  Phoneme Mode (D)

    This command disables the text-to-phonetics translator, allowing
    DoubleTalk's phonemes to be accessed directly. Table 5 lists the phonemes
    that can be produced by DoubleTalk.

    When concatenating two or more phonemes, each phoneme must be delimited by
    a space. For example, the word "computer" would be represented phonetically
    as K AX M P YY UW DX ER.

  Phoneme attribute tokens

    Table 6 lists the voice attribute tokens that can be used in the Phoneme
    mode, in addition to the standard DoubleTalk commands. These tokens do not
    require the command character or any parameters.

    As indicated in the table, the / and \ tokens temporarily increase and
    decrease the pitch by m steps. Besides being temporary, the difference
    between using the pitch tokens and the Pitch command (nP) is that the
    effective pitch range is extended beyond the normal 0-99 range by
    approximately ±20 steps, and if the pitch should fall out of range, it will
    simply bottom or top out, instead of wrap around.

    All other phoneme attribute token commands remain in effect until
    explicitly changed.












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       Phoneme   Example              Phoneme   Example
       Symbol    Word                 Symbol    Word
       -------------------------------------------------------
       A         dAs (Spanish)        M         Me
       AA        cOt                  N         New
       AE        cAt                  NG        ruNG
       AH        cUt                  NY        niño
       AW        cOW                  O         nO (Spanish)
       AX        bottOm               OW        bOAt
       AY        bIte                 OY        bOY
       B         BiB                  P         PoP
       CH        CHurCH               PX        sPo
       D         DiD                  R         Ring
       DH        eiTHer               RR        tRes (Spanish)
       DX        ciTy                 S         Sell
       E         sEr (Spanish)        SH        SHell
       EH        bEt                  T         Tin
       EI        mEsa (Spanish)       TH        THin
       ER        bIRd                 TX        sTick
       EW        actEUr (French)      U         Uno (Spanish)
       EY        BAke                 UH        bOOk
       F         Fee                  UW        bOOt
       G         GaG                  V         ValVe
       H         He                   W         We
       I         lIbro (Spanish)      WH        When
       IH        bIt                  Y         maYo (Spanish)
       IX        rabbIt               YY        You
       IY        bEEt                 Z         Zoo
       J         aGe                  ZH        viSion
       K         Cute                 space     variable pause *
       KX        sKi                  ,         medium pause
       L         Long                 .         long pause

    Table 5. Synthesizer Phonemes
    * Normally used between words; duration determined by nT command




       Symbol   Function
       ---------------------------------
       nn       Set pitch to 'nn' (0-99)
       /        Increase pitch m steps *
       \        Decrease pitch m steps *
       +        Increase speed 1 step
       -        Decrease speed 1 step
       >        Increase volume 1 step
       <        Decrease volume 1 step

    Table 6. Phoneme Attribute Tokens
    * Step size determined by nE command; m = 2n




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  Applications of Phoneme mode

    Phoneme mode is useful for creating customized speech, when the normal
    text-to-speech modes are inappropriate for producing the desired voice
    effect. For example, Phoneme mode should be used to change the stress or
    emphasis of specific words in a phrase. This is because Phoneme mode allows
    voice attributes to be modified on phoneme boundaries within each word,
    whereas Text mode allows changes only at word boundaries. This is
    illustrated in the following program examples.

       100 A$ = CHR$(1)
       105 LPRINT A$;"D";A$;"M"
       110 LPRINT "70H AW   -/D>/EH R   +<\\YY UW   S P\IY K   T UW
           \M IY   DH AE T   -\W EY .+/"

    Note in line 105 that expression is disabled, since the pitch variations
    due to the internal intonation algorithms would otherwise interfere with
    the pitch tokens. Compare this with the same phrase produced in Text mode
    with expression enabled:

       100 A$ = CHR$(1)
       105 LPRINT A$;"T";A$;"E"
       110 LPRINT "How dare you speak to me that way!"

    Phoneme mode is also useful in applications that provide their own text-to-
    phoneme translation, such as the front end of a custom text-to-speech
    system.


  Sleep Timer (nQ)

    This command places the DoubleTalk LT in a nearly powered-down state, in
    order to help conserve battery power (the command has no effect on the
    DoubleTalk PC). If you tend to forget to turn off your DoubleTalk at the
    end of the day or during lunch breaks, for example, the Sleep mode timer
    can be used to turn it off automatically. (DoubleTalk doesn't actually turn
    completely off - it enters a low-power state which consumes about one-tenth
    the power it would otherwise.) An audible reminder tone can even be
    programmed to sound every ten minutes, to remind you that you have left
    DoubleTalk on.

    The sleep timer is reset anytime DoubleTalk is accessed from your computer
    (such as when reading). In this way, DoubleTalk will not shut itself off
    during normal use, as long as the programmed timer interval is longer than
    the maximum time DoubleTalk is inactive. The sleep timer is also disabled
    when DoubleTalk is running from the AC adapter, i.e., the timer runs only
    when operating from DoubleTalk's internal battery.

    Once DoubleTalk has entered Sleep mode, it can be woken only by turning the
    power off and back on. The serial port control signal DTR is forced to its
    "not ready" state when DoubleTalk is asleep, preventing application
    programs from attempting to send DoubleTalk any more data. Just before



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    going to sleep, DoubleTalk emits the ASCII character "S" from the serial
    port, which the host computer can use to detect DoubleTalk's sleep state.

    The command parameter n determines when Sleep mode will be entered. You can
    place DoubleTalk in Sleep mode immediately, program the sleep timer to any
    of 15 ten-minute intervals (10 to 150 minutes), or disable Sleep mode
    altogether. Table 7 summarizes the Sleep mode command.

       n       Delay
       ----------------------------
       0       Sleep timer disabled
       1       10 min
       2       20 min
       .       .
       .       .
       15      150 min
       16      0 (immediate)
       17      10 min w/reminder
       18      20 min w/reminder
       .       .
       .       .
       31      150 min w/reminder

    Table 7. Sleep Mode Timer

    Note that the delay interval is simply n x 10 minutes for 0 < n < 16.
    Adding 16 to n (16 < n < 32) yields the same interval range, but also
    enables the reminder tone, which sounds at the end of each ten minute
    interval. Programming n = 0 disables the Sleep mode; setting n = 16 forces
    DoubleTalk to go to sleep as soon as it has stopped speaking (even when
    running from the AC adapter). Delay 22 (60 minutes with the reminder tone)
    is the default setting.


  PCM Mode (#/n#)

    These commands activate DoubleTalk's PCM modes. This is an advanced topic
    discussed in the Developer's Tools.


  Protocol Options (nG)

    This command controls various internal operating parameters in DoubleTalk.
    Refer to the Developer's Tools for more information.


  Index Marker (nI)

    Index markers are non-speaking "bookmarks" that a program can use to
    monitor the progress of the TTS synthesizer's output. Since this is a
    command only programmers would use, it too is covered in the Developer's
    Tools.



  RC SYSTEMS                           - 31 -                   DOUBLETALK PC/LT






  Interrogate (?)

    This command enables a program to read DoubleTalk's current settings. Yep,
    you guessed it - you're gonna need the Developer's Tools to learn more
    about this one, too.


  Clear (Control-X)

    The Clear command stops the synthesizer and clears the input buffer of all
    text and commands. None of the synthesizer settings are affected, but any
    untranslated commands will be ignored.

    Note that the format of this command is unique in that the command
    character (Control-A) is not used with it. The Control-X (18h) character is
    written directly to DoubleTalk's I/O port, which enables DoubleTalk to
    react immediately, even if its input buffer is full. To be most effective,
    the states of DoubleTalk's handshaking signals should be ignored when
    writing the Clear command.




































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  Command Summary

    Table 8 is a summary of the commands supported by DoubleTalk.

       Command    Function                         Range     Default
       -------------------------------------------------------------
       nA         Articulation disabled             0-9         5
       nB         Punctuation filter                0-15        6
       C/nC       Character mode/delay              0-31        0
       D          Phoneme mode                       -          -
       E/nE       Expression                        0-9         5
       nF         Formant frequency                 0-9         5
       nG         Protocol options                  0-63        2
       nI         Index marker                      0-99        -
       J/nJ       Musical/sine tone generators      0-99        -
       L          Load exception dictionary          -          -
       M          Monotone                           -          -
       nO         Voice                             0-7         0
       nP         Pitch                             0-99        50
       nQ         Sleep mode (LT only)              0-31        22
       nR         Reverb                            0-9         0
       nS         Speed                             0-9         5
       T/nT       Text mode/delay                   0-15        0
       U          Enable exception dictionary        -          -
       nV         Volume                            0-9         5
       nX         Tone                              0-2         1
       nY         Timeout delay                     0-15        0
       Z          Zap commands                       -          -
       @          Reinitialize                       -          -
       ?          Interrogate                        -          -
       n*         DTMF generator                    0-16        -
       #          Non-buffered PCM mode              -          -
       n#         n# Buffered PCM mode              0-99        -

    Table 8. Command Summary




















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  APPENDIX A
  LPC Word Lists

    File: WORDS1
    Gender: male
    # words: 206

    Zero          1          one           6          two          11
    three        16          four          2          five          7
    six          12          seven        17          eight         3
    nine          8          ten          13          eleven       18
    twelve        4          thir-         9          fif-         14
    teen         19          twenty        5          hundred      10
    thousand     15

    A            39          abort        73          about        79
    adjust      148          alert       147          all         112
    alpha        46          amps         97          and         173
    area        139          at          110          automatic    70

    B            20          between     149          bravo        49
    break       187          button      151

    C            27          calibrate   189          call         74
    cancel      113          caution     176          change       63
    charlie      51          check       178          circuit     140
    clock       152          complete    102          connect     141
    control     108          crane       190          cycle        75

    D            33          danger       61          days        114
    degrees     179          delta        48          device      153
    direction   191          display      76          door        115
    down        183

    E            40          east        154          echo         47
    electrician 109          enter       192          equal        77
    exit        116

    F            21          fail        155          farad       174
    fast         78          feet        193          fire        100
    flow        117          foxtrot      50          frequency   156
    from        194

    G            28          gallons     130          gate        157
    gauge       118          get         195          go           80
    golf         52          green       119

    H            34          henry        53          hertz       136
    high        158          hold        196          hours       188

    I            41          inch         81          india        92
    inspector   120          intruder    159          is          146


  RC SYSTEMS                           - 34 -                   DOUBLETALK PC/LT






    J            22          juliet      131

    K            29          kilo        169

    L            35          left        197          light       177
    lima         54          line         67          low          82

    M            42          machine     106          manual      121
    measure     160          mega         98          meter        60
    micro       137          mike         93          mill        198
    milli       175          minus        64          minutes     150
    motor        83          move        122

    N            23          north       161          not          65
    november    132          number      184

    O            30          of          199          off          68
    ohms        138          on          107          open         84
    operator     91          oscar       170          out         185
    over        123

    P            36          papa         55          pass        162
    passed      200          percent      85          pico         99
    plus        124          point       186          position    163
    power       101          press       201          pressure     62
    probe        86          pull        125          push        164

    Q            43          quebec       94

    R            24          range       202          ready        87
    red         111          repair      103          repeat      126
    right       165          romeo       133

    S            31          safe        203          seconds     142
    service     180          set          88          shut        127
    sierra      171          slow        166          smoke        72
    south       204          speed        89          start        66
    stop        105          switch      181

    T            37          tango        56          temperature 104
    test        128          the          58          time         69
    timer       144          tool        167          turn        205

    U            44          under        90          uniform      95
    unit        143          up          145

    V            25          valve       182          victor      134
    volts       129

    W            32          wait         71          watts        59
    west        168          whiskey     172

    X            38          x-ray        57


  RC SYSTEMS                           - 35 -                   DOUBLETALK PC/LT






    Y            45          yankee       96          yellow      206

    Z            26          zulu        135




















































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    File: WORDS2
    Gender: female
    # words: 35

    the           1          time          2          is            3
    a.m.          4          p.m.          5          oh            6
    o'clock       7          one           8          two           9
    three        10          our          11          five         12
    six          13          seven        14          eight        15
    nine         16          ten          17          eleven       18
    twelve       19          thirteen     20          fourteen     21
    fifteen      22          sixteen      23          seventeen    24
    eighteen     25          nineteen     26          twenty       27
    thirty       28          forty        29          fifty        30
    good         31          morning      32          afternoon    33
    evening      34          (pause)      35







































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  APPENDIX B
  DoubleTalk LT Cable Connections



                                _________________
                              /                   \
                           5 |  o   o   o   o   o  | 1
                             |                     |
                           9  \   o   o   o   o   / 6
                               \_________________/


                           Figure B-1. DB9-F Connector





                Pin No.  Symbol      Description        Direction
                -------------------------------------------------
                   1     NC          No Connection
                   2     TXD         Transmit Data      Output
                   3     RXD         Receive Data       Input
                   4     DSR         Data Set Ready     Input
                   5     SG          Signal Ground
                   6*    DTR         Data Terminal      Output
                                     Ready
                   7     NC          No Connection
                   8*    RTS         Request To         Output
                                     Send
                   9     RI          Ring Indicator     Output

               * Jumpered together in cable

    Table B-1. Serial Cable Connections


















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  APPENDIX C
  Specifications


  DoubleTalk PC

        Processor (CPU) -  Intel 12.5 MHz 80C188EB

        On Board Memory -  512K ROM
                           8K RAM

       Supported Speech
           Technologies -  Text-to-speech (TTS)
                           Linear Predictive Coding (LPC)
                           Pulse Code Modulation (PCM)
                           Adaptive Delta Pulse Code Modulation (ADPCM)
                           Continuously Variable-Slope Delta (CVSD)

        Tone Generators -  3 musical
                           2 sinusoidal
                           Touch-Tone

        TTS Synthesizer -  3K input buffer
                           3 operating modes
                           8 voices
                           10 speeds
                           10 formant frequencies
                           100 pitches
                           10 volume levels
                           10 expression levels
                           10 articulation levels
                           10 reverb levels
                           3 tone levels
                           16 word/character delays
                           16 timeout delays
                           16 punctuation levels

        LPC Synthesizer -  4K data buffer
                           5220 and D6 data formats
                           2 speeds
                           8 kHz sampling rate

        PCM Synthesizer -  PCM/ADPCM 8 bit mono
                           4K sample buffer
                           100 sampling rates (4 kHz to 11 kHz)
                           10 volume levels
                           0 to 48 kHz non-buffered mode

       CVSD Synthesizer -  32 kbps sampling rate





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           Audio Output -  0.5 W (8 ohms)
                           Bridge-tied (live ground), dc-coupled
                           3.5 mm monaural jack

             System IRQ
           Requirements -  none

             System DMA
           Requirements -  none

          System Memory
           Requirements -  none

             System I/O
           Requirements -  Two 8-bit ports: 25E/F, 29E/F, 2DE/F, 31E/F,
                           35E/F, or 39E/F (jumper selectable)

      Power Consumption -  75 mA maximum active at min. volume
                           25 mA standby (+5 V)

                   Size -  3.9" x 5.1"







  DoubleTalk LT

        Processor (CPU) -  Intel 10 MHz 80C188EB

        On Board Memory -  512K ROM
                           8K RAM

       Supported Speech
           Technologies -  Text-to-speech (TTS)
                           Linear Predictive Coding (LPC)
                           Pulse Code Modulation (PCM)
                           Adaptive Delta Pulse Code Modulation (ADPCM)
                           Continuously Variable-Slope Delta (CVSD)

        Tone Generators -  3 musical
                           2 sinusoidal
                           Touch-Tone










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        TTS Synthesizer -  3K input buffer
                           3 operating modes
                           8 voices
                           10 speeds
                           10 formant frequencies
                           100 pitches
                           10 volume levels
                           10 expression levels
                           10 articulation levels
                           10 reverb levels
                           3 tone levels
                           16 word/character delays
                           16 timeout delays
                           16 punctuation levels

        LPC Synthesizer -  4K data buffer
                           5220 and D6 data formats
                           2 speeds
                           8 kHz sampling rate

        PCM Synthesizer -  PCM/ADPCM 8 bit mono
                           4K sample buffer
                           100 sampling rates (4 kHz to 11 kHz)
                           10 volume levels

       CVSD Synthesizer -  32 kbps sampling rate

           Audio Output -  Internal speaker: 8 ohms, 0.5 W
                           Headphones: 3.5 mm monaural jack, 75 ohms

             System IRQ
           Requirements -  none

             System DMA
           Requirements -  none

          System Memory
           Requirements -  none

             System I/O
           Requirements -  One serial port: 9600 baud, 8 data bits,
                           1 stop bit, no parity, RTS/CTS handshaking

      Power Consumption -  75 mA maximum active at min. volume
                           25 mA standby
                           4 mA sleep
                           AC adapter or 9 V alkaline battery

                   Size -  5.3" x 4.0" x 1.5"

                 Weight -  11 oz (without battery)




  RC SYSTEMS                           - 41 -                   DOUBLETALK PC/LT
