The Echo II was a plug-in expansion card, speech synthesizer card for the

Apple II The Apple II (stylized as ) is an 8-bit home computer and one of the world's first highly successful mass-produced microcomputer products. It was designed primarily by Steve Wozniak; Jerry Manock developed the design of Apple II's foam-m ...

and Apple IIe personal computers that allowed applications to use speech synthesis. The Echo II used the

TMS5220 The Texas Instruments LPC Speech Chips are a series of speech synthesizer digital signal processor integrated circuits created by Texas Instruments beginning in 1978. They continued to be developed and marketed for many years, though the speech dep ...

speech synthesis chip to synthesize speech. The Echo II software could synthesize either unlimited text-to-speech using stitched phonemes, or play back raw LPC data for specific words, with resulting higher speech quality. LPC ( linear predictive coding) was the speech synthesis technology used, which allowed applications to encode speech data in a compact form. The Echo II used the TMS 5220 LPC Speech Chip which was popular in other speech synthesizers

References

External links

Mirrors.apple2.org.za

Compute ISSUE 50 / JULY 1984 (available online)

{{Speech synthesis Apple II peripherals Speech synthesis