Silence description coding for multi-rate speech codecs

  • US 7,120,578 B2
  • Filed: 04/24/2001
  • Issued: 10/10/2006
  • Est. Priority Date: 11/30/1998
  • Status: Expired due to Fees
First Claim
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1. A communication device having a multi-rate speech coder that performs silence description coding of a speech signal having varying characteristics, comprising:

  • a voice activity detection circuit that is capable of identifying a substantially speech-like characteristic of a segment of the speech signal; and

    a processing circuit communicatively coupled to the voice activity detection circuit, the processing circuit being capable of selectively applying one of a plurality of coding modes to the segment of the speech signal,wherein the plurality of coding modes comprises a plurality of speech coding modes and a silence description coding mode,wherein the processing circuit selects the silence description coding mode upon the identification of the absence of a substantially speech-like characteristic of the segment of the speech signal independent of the speech coding mode applied before the segment.

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