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LSF coefficient vector quantizer for wideband speech coding

  • US 20040176951A1
  • Filed: 12/30/2003
  • Published: 09/09/2004
  • Est. Priority Date: 03/05/2003
  • Status: Abandoned Application
First Claim
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1. A line spectral frequency coefficient vector quantizer comprising:

  • a prediction structure quantizer that comprises a first vector quantizer which non-structurally quantizes a line spectral frequency coefficient vector to calculate a candidate vector to be quantized, a predictor which calculates a predicted line spectral frequency vector of the line spectral frequency coefficient vector, and a first lattice quantizer which lattice-quantizes the candidate vector with reference to the predicted line spectral frequency vector to calculate a final prediction quantization vector of the line spectral frequency coefficient vector;

    a non-prediction structure quantizer that comprises a second vector quantizer which non-structurally quantizes the line spectral frequency coefficient vector to calculate a candidate vector to be quantized and a second lattice quantizer which lattice-quantizes the candidate vector to calculate a final non-prediction quantization vector of the line spectral frequency coefficient vector; and

    a switch that determines one having a small difference from the line spectral frequency coefficient vector, from the final prediction quantization vector and the final non-prediction quantization vector, as a final quantization vector of the line spectral frequency coefficient vector.

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