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FIXED CODEBOOK SEARCHING APPARATUS AND FIXED CODEBOOK SEARCHING METHOD

  • US 20090228266A1
  • Filed: 02/25/2009
  • Published: 09/10/2009
  • 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 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 that generates a Toeplitz-type convolution matrix using the second impulse response vector generated by the convolution operator; and

    a searcher that performs a codebook search by maximizing a term using the Toeplitz-type convolution matrix,wherein a time length of negative time elements of the second impulse response vector is shorter than a time length of nonnegative time elements.

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