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FIXED CODE BOOK SEARCH DEVICE AND FIXED CODE BOOK SEARCH METHOD

  • US 20090292534A1
  • Filed: 12/08/2006
  • Published: 11/26/2009
  • Est. Priority Date: 12/09/2005
  • Status: Active Grant
First Claim
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1. A fixed codebook search method for searching a fixed codebook that generates a fixed codebook vector by convoluting a shape vector with a pulse, the fixed codebook search method comprising the steps of:

  • filtering a linear prediction residual signal using a filter having opposite characteristics with respect to a filter that convolutes the shape vector;

    limiting pulse position candidates in a pulse vector using a first evaluation function that minimizes error between a signal acquired by filtering using the filter having the opposite characteristic and the pulse vector; and

    searching the fixed codebook using the limited pulse position candidates and a second evaluation function.

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