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Recursively excited linear prediction speech coder

  • US 6,704,703 B2
  • Filed: 02/02/2001
  • Issued: 03/09/2004
  • Est. Priority Date: 02/04/2000
  • Status: Expired due to Term
First Claim
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1. A method for determining an excitation signal in an analysis-by-synthesis speech coder, the excitation signal being a sum of at least three vector terms, each vector term k being a product of a codebook vector Zk and an associated gain term gk, the method comprising:

  • determining a first vector term g0z0 representative of a target excitation vector x; and

    recursively determining each remaining vector term k as a vector term gkzk representative of the difference between the target excitation vector x and the sum of previously determined vector terms,

    i=0k-1


    gi

    zi
    ,
    embedded imageandwherein the gain term of each vector term is determined by minimizing an error function E representative of the difference between the target excitation vector x and the sum of that vector term and all previously determined vector terms,

    i=0k-1


    gi

    zi.
    embedded image

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