The SpeakJet is a completely self contained, single chip voice and complex sound synthesizer. It uses Mathematical Sound Architecture tm (MSA) technology which controls an internal five channel sound synthesizer to generate on-the-fly, unlimited vocabulary speech synthesis and complex sounds. The SpeakJet is preconfigured with 72 speech elements (allophones), 43 sound effects, and 12 DTMF Touch Tones. Through the selection of these MSA components and in combination with the control of the pitch, rate, bend, and volume parameters, the user has the ability to produce unlimited phrases and sound effects, with thousands of variations, at any time. This is not recorded waveforms or sound fragments but truly synthetic sound. The SpeakJet can be controlled simultaneously by logic changes on any one of its eight Event Input lines, and/or by a Serial Data line from a CPU (such as the OOPic, Basic Stamp or PC) allowing for both CPU- Controlled and Stand-Alone operations. Other features include an internal 64 byte input buffer, Internal Programmable EEPROM, three programmable outputs, and direct user access to the internal five channel sound synthesizer.
The SpeakJet is a self‑contained, single‑chip voice and complex sound synthesizer that uses Mathematical Sound Architecture (MSA) technology. It provides 72 speech elements, 43 sound effects, and 12 DTMF tones, and can be controlled via eight event inputs or a serial data line.
The document details the pin assignments, electrical and mechanical specifications, serial control protocol (SCP), memory access methods, and operational modes. It also describes how to program the internal 256‑byte EEPROM and how to use the three programmable digital outputs for external device control.
| Supply voltage | 2.0 to 5.5 VDC |
|---|---|
| Supply current (idle) | <5 mA |
| Supply current (speaking) | <5 mA |
| Output current | 25 mA |
| EEPROM write cycles | Typical 1,000,000 times |
| Thermal storage range | -60 °C to +140 °C |
| Thermal operating range | -18 °C to +60 °C |
| Internal EEPROM size | 256 bytes |
Send "\0" to enter serial control mode, then send "V"; the SpeakJet will enunciate "Ready".
The factory default setting is 9600 baud.
The SpeakJet provides eight event inputs (E0–E7).
The internal EEPROM holds 256 bytes of data.