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Method for vector quantizing speech signals

  • US 6,175,817 B1
  • Filed: 05/18/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 11/20/1995
  • Status: Expired due to Term
First Claim
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1. A method for vector quantizing a speech sample, said method comprising the following steps:

  • a) entering fixed excitation vectors of an LPC filter for speech prediction in a first codebook (CB1), b) entering excitation vectors of a pitch synthesis filter in a second codebook (CB2);

    c) modifying said excitation vectors in said second codebook (CB2) after each sub-frame;

    d) establishing a predetermined error criterion for selection of excitation vectors from the second codebook (CB2);

    e) selecting at least two of said excitation vectors from the second codebook (CB2) to obtain optimum prediction values according to said predetermined error criterion;

    f) linking said at least two excitation vectors selected in step e) with a plurality of said excitation vectors from said first codebook (CB1) to form a set of linked vectors;

    g) selecting a matching vector from said linked vectors having a minimal variation from said speech sample according to a predetermined variation guideline; and

    h) thinning out said fixed excitation vectors in said first codebook.

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