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CS-ACELP speech compression system with adaptive pitch prediction filter gain based on a measure of periodicity

DC
  • US 5,664,055 A
  • Filed: 06/07/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method for use in a speech processing system which includes a first portion comprising an adaptive codebook and corresponding adaptive codebook amplifier and a second portion comprising a fixed codebook coupled to a pitch filter, the pitch filter comprising a delay memory coupled to a pitch filter amplifier, the method comprising:

  • determining the pitch filter gain based on a measure of periodicity of a speech signal; and

    amplifying samples of a signal in said pitch filter based on said determined pitch filter gain.

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