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Speech encoding method and apparatus

  • US 6,003,001 A
  • Filed: 06/25/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 07/09/1996
  • Status: Expired due to Fees
First Claim
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1. A speech encoding method in which an input speech signal is divided on a time axis in terms of a pre-set frame comprising the steps of:

  • judging based on signal energy of the input speech signal of each current frame whether the input speech signal of each current frame is voiced and synthesizing the speech signal by selectively switching at least one of an adaptive codebook and a fixed codebook as a source of excitation;

    control means selectively employing said adaptive codebook for the input speech signal judged to be voiced; and

    supplying an output of the adaptive codebook to a synthesis filter for synthesis of the input speech signal judged to be voiced.

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