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Speech coding system and method including spectral quantizer

  • US 6,094,629 A
  • Filed: 07/13/1998
  • Issued: 07/25/2000
  • Est. Priority Date: 07/13/1998
  • Status: Expired due to Term
First Claim
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1. A method for quantizing line spectral frequencies representing the spectral envelope of frames of a speech signal, said method comprising the steps of:

  • vector quantizing the LSFs for even numbered frames using a particular number of those bits which are available for LSF quantization;

    quantizing the LSFs for odd numbered frames by interpolation, said interpolation comprising the steps of(a) determining the spectral sensitivity for each LSF in said odd numbered frame;

    (b) allocating, among the LSFs in said odd numbered frames, the remainder of said number of bits available, said allocation being such as to provide more bits to those of said LSFs in said odd numbered frames which have a large amount of spectral sensitivity than are provided to those LSFs having a lesser amount of spectral sensitivity; and

    (c) quantizing said LSFs in said odd numbered frames using the allocated number of bits.

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