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Vector quantizing for lpc parameters

  • US 20040015346A1
  • Filed: 05/27/2003
  • Published: 01/22/2004
  • Est. Priority Date: 11/30/2000
  • Status: Active Grant
First Claim
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1. An LPC parameter vector quantization apparatus comprising:

  • a first calculation section that calculates distortion between a plurality of codevectors read successively from a codebook storing many codevectors and a quantization target using a first distortion evaluation measure;

    a pre-selection section that preliminarily selects codevectors that reduce the amount of distortion according to said first distortion evaluation measure from said many codevectors;

    a second calculation section that calculates distortion between the preliminarily selected codevectors and said quantization target using a second distortion evaluation measure which is different from said first distortion evaluation measure; and

    a final search section that specifies a codevector that minimizes the amount of distortion according to said second distortion evaluation measure from the preliminarily selected codevectors and outputs index information of the specified codevector.

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