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Codebook sharing for LSF quantization

  • US 8,635,063 B2
  • Filed: 01/26/2009
  • Issued: 01/21/2014
  • Est. Priority Date: 09/18/1998
  • Status: Expired due to Fees
First Claim
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1. A multi-rate speech coding system capable of operating in one of a first coding rate and a second coding rate, the multi-rate speech coding system comprising:

  • a vector quantizer (VQ) for quantizing line spectral frequencies (LSFs), the VQ including a first VQ stage and a second VQ stage;

    a processing circuitry configured to;

    determine whether the multi-rate speech coding system is configured to operate in the first coding rate or the second coding rate;

    quantize the LSFs using the first VQ stage and not the second VQ stage when the processing circuitry determines that the multi-rate speech coding system is configured to operate in the first coding rate; and

    quantize the LSFs using both the first VQ stage and the second VQ stage when the processing circuity determines that the multi-rate speech coding system is configured to operate in the second coding rate.

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