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Truespeech is a proprietary audio codec produced by the DSP Group. It is designed for encoding voice data at low bitrates, and to be embedded into DSP chips. True speech has been integrated into Windows Media Player, and is the format used by the voice chat features of Yahoo Messenger.
Truespeech has been implemented in the next release of FFmpeg [1], and source code is available from the current development head http://svn.mplayerhq.hu/ffmpeg/trunk/libavcodec/truespeech.c?view=markup
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