A vocoder based voice recognizer recognizes a spoken word using linear prediction coding (LPC) based, vocoder data without completely reconstructing the voice data. The recognizer generates at least one energy estimate per frame of the vocoder data and searches for word boundaries in the vocoder data...http://www.google.com/patents/US6003004?utm_source=gb-gplus-sharePatent US6003004 - Speech recognition method and system using compressed speech data
