Echo 2

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 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

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Speech synthesis

Free software	eSpeak Gnopernicus Gnuspeech Orca Festival Speech Synthesis System FreeTTS Sinsy Automatik Text Reader

Proprietary software	DECtalk Software Automatic Mouth Talk It! Microsoft Agent Microsoft Speech API Microsoft text-to-speech voices Readspeaker Voice browser CoolSpeech BrowseAloud LaLaVoice Vocaloid Cantor Symphonic Choirs IVONA CereProc Utau Voiceroid NIAONiao Virtual Singer Vocalina Realivox CeVIO Creative Studio Chipspeech Alter/Ego PPG Phonem

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 SABLE VoiceXML

Developers/ Researchers	Alan W. Black Catherine Browman Franklin Seaney Cooper Gunnar Fant Haskins Laboratories Wolfgang von Kempelen Ignatius Mattingly Philip Rubin Yamaha

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

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