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Photo B. The S2A speech synthesizer board from Te/esensory Systems, Inc. The large Ie is the CRC micro-cccuotler. The entire 24-word vocabulary is contained in the smaller 16K ROM. All connections are by way of the double-sided card edge connector (10 pins per side). work. But, recogn izing potential need for a specific multiplex rate, the designe rs at lSI allowed provision for user control of the multiplex rate on the l SI 7031 counter Ie. By removing t he capacitor normally u sed for t he o n-board clock, it is possible to control the sca n oscillator in the chip. A Scan Reset pin is provided, which advances the sca n counter in the IC to the left-ha nd digit- Th is pin could be used to reset the scan counter, but it wasn't found to be necessary. However, by applying a pulse to pin 39, the scan inpu t, the counter IC would step across t he display, left to right, just as was desi red! The actual interface is very simple, consisting of just one 4D-cent CMOS gate package in addition to power supply and a udio amplifier parts (see Fig. 1). The speech readout is initiated by pressing the Speak switch, which sets an R-$ flip-flop a nd allows the st robe line to go true. There will be a short pulse when the Busy line signals the end of the word, and this acts as a c lock pulse to move the scan counte r in the counter Ie on to the next digit. The process continues until the last digit is spoke n. when the pos itive edge from the eighth counte r digit serves to reset the flipflop a nd term ina te the speech. The only connections required to the counter a re the four BC D data lines, the addition of a switch to the scan input to se lect visual or audible drsplay. and a wire to the eighth digit strobe. Because of the ease of interfacing this circuit, it should be eas ily d u p licate d, a nd TSI Model S2A Synthesizer Vocabulary list Data Code Word (Octal) 000 001 002 003 004 005 006 007 01 0 011 012 013 0 14 0'5 01. 017 020 021 022 023 02' 025 02. 027 030 Oh One Two Three Four Five Six Seven Eight Nine Itmes.Mtnus Equa ls Percent Not used Low Over Root Em Times Point Overflow Minus Plus Clear Swap Photo C. Inside the counter. The speech board is visible on the feft and the power supply andamplifier-interface circuit board are on the right. Note D IP-plug connections to counter mainframe. Large modufe at right is dddc converter that generates -10 vo lts fo r synthesizer. Speaker is mounted to top cover. Table 1. The " voice" o f the S2A is that of Dr. Forres t Mozer, inventor of the speech-generation afgorithm used by the LSI controlfer. The speech synthesizer is a static-sensitive device and normal MaS handling precautions should be observed. 54 73 Magazine· April, 1981
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Don't wait any ~ to pullout weak, rare OX, CAll TOll FllEE ••• 800-647·1800 Call 601·323·5869 lor technical information. order/repair status. Also call 601-323-5869 ou tside continental USA and in Mississippi. ...u MFJ ENTERPRISES BOX 494, MISSISSIPPI STATE, MS !9162 INC. possi bly ad aptab le to ot her eq uipment. A glance at the d ata book reveals that seve ral popular AID chips commonly used in digital multimeters and some clock ICs provide similar access to the multiplex scan clock. In fact, just about any device with a multiplexed display would be a good cand idate fo r an artificial vo ice implant ! Co nstruction is non-crit i cal, and inside the metal OSI case, no problems w ith rf have been encountered. Removal of the lead-acid battery pack provided plentv of space fo r the l SI module and the interface/amplifier board. Connections are merely tack-soldered to the co unter PC board, with plug-in DIP ca bles to the added board . Power can easily be robbed from the counter, with a 7805 regulator and the dc/d c converter used to power the synthesizer. M in us 10 volts is needed , but since a minus 12-vol t converte r was available, a few diodes were used to d rop t he voltage a bit. So me experimentation m ay be needed to fine tune the audio filtering for a spec if ic amplifier-speaker configurat ion. Use of a goodsized speaker helps intelligibility, as does tweaking the clock pot on the S2A board . Fu rt he r enhancements could include lead ing-zero suppress io n and automatic " po int" insertion for locating the decimal. But the added complexity and circuitry required m ay offset any possib le advantage. After a few minutes use, one becomes quite ad ept at reading frequencies, and frills aren 't missed while enjoying the "Cvlon-Iike" so und of the counter! O ne idea worth exploring, though, is to separate the " talker" by itsel f, making it easier to use o ne sy nt hes ize r o n severa l inst ruments, But in a few years, advances in speec h technology w il l decrease cos t s enough that o ne won't mind having a ded i cated voicebox in every instrum ent. In f act, app licat ions for artificial-speec h devices are by no means limited to aids for the handicapped. It is quite handy to check frequency without craw ling underneath a dash-mounted rad io, o r to be able to get a frequency report right from the repeater's m outh. At least o ne repeater uses the l SI m odu les for 10 and telemetry, and more applications for this versatile and affordable m o dule j u st await the experimenter's im aginatio n! A Talking Counter is a valuable tool for t he blind ham o r technician. The marriage of t he OSI co unter and the l SI synt hesizer is a natural and, hopefull y, wil l open t he door for more useful and inexpensive app lic a t io ns of modern artificial sp e ec h sy nt h es is t ec h niques.• Ref erences 1. Model S2A speech synthesi zer is available from Telesensory Systems, Inc., 340B Hillview Ave., PO Box 10099, Palo Alto CA 94304. 2. Information on the LS 7031 counter IC is available from LSI Computer Systems, tnc., 1235 Wa lt Whitman Rd., Melville NY 11746. 3. The DC-512 dc/dc convert er Is ava ilab le fo r $9.95 each h om The Megavisio n Corporatio n, PO Bo x 122, Columbus NE 68601. 73 Magazine. April, 1981 55
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