Periodicity enhancement in decoding wideband signals

  • US 6,795,805 B1
  • Filed: 07/23/2001
  • Issued: 09/21/2004
  • Est. Priority Date: 10/27/1998
  • Status: Expired due to Term
First Claim
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1. A device for enhancing periodicity of an excitation signal produced in relation to a pitch codevector and an innovative codevector for supplying a signal synthesis filter in view of synthesizing a wideband speech signal, said periodicity enhancing device comprising:

  • a) a factor generator for calculating a periodicity factor related to the wideband speech signal; and

    b) an innovation filter for filtering the innovative codevector in relation to said periodicity factor to thereby reduce energy of a low frequency portion of the innovative codevector and enhance periodicity of a low frequency portion of the excitation signal.

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