Echo 2

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This article is about the speech synthesizer card. For the satellite, see Project Echo.

The Echo II was a plug-in expansion card, speech synthesizer card for the Apple II and Apple IIc personal computers that allowed applications to use speech synthesis. The Echo II used the TMS5220 speech synthesis chip, which could accept either phonemes or raw LPC data, 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


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