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Fixed codebook searching apparatus and fixed codebook searching method

  • US 7,957,962 B2
  • Filed: 02/25/2009
  • Issued: 06/07/2011
  • Est. Priority Date: 03/10/2006
  • Status: Active Grant
First Claim
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1. A fixed codebook searching apparatus, comprising:

  • a convolution operator, implemented by at least one processor, that convolves an impulse response of a perceptually weighted synthesis filter with an impulse response vector that has values at negative times, to generate a second impulse response vector that has values at negative times;

    a matrix generator, implemented by the at least one processor, that generates a Toeplitz-type convolution matrix using the second impulse response vector generated by the convolution operator; and

    a searcher, implemented by the at least one processor, that performs a fixed codebook search by maximizing a term using the Toeplitz-type convolution matrix.

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