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 speech synthesizer card for the Apple II and Apple IIc personal computers. The Echo II used the TMS5220 speech synthesis chip, which could accept either phonemes or raw LPC data, with resulting higher speech quality.

The Original Echo II

The Echo II was a plug-in expansion card designed for the Apple II computer, and allowed applications to use speech synthesis. 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

v t e Speech synthesis

Proprietary software	BrowseAloud CereProc DECtalk IVONA Microsoft Agent Microsoft Speech API Microsoft text-to-speech voices Readspeaker Talk It! Voice browser Vocaloid Cantor Voiceroid

Free software	eSpeak Gnuspeech Festival Speech Synthesis System FreeTTS

Shareware	Utau

Machine	Echo 2 Pattern playback Phasor RIAS Texas Instruments LPC Speech Chips TuVox

Applications	AOLbyPhone DialogOS Dr. Sbaitso MBROLA Microsoft Narrator Microsoft Speech Server PlainTalk Voice font

Protocols	Speech Synthesis Markup Language

Developers/Researchers	Catherine Browman Franklin Seaney Cooper Gunnar Fant Haskins Laboratories Wolfgang von Kempelen Ignatius Mattingly Philip Rubin VoiceWeb VoiceXML Yamaha

Process	Articulatory synthesis Concatenative synthesis Currah Inverse filter PSOLA Phase vocoder SABLE Self-voicing

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