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Method and apparatus for efficient multiband celp wideband speech and music coding and decoding

  • US 5,778,335 A
  • Filed: 02/26/1996
  • Issued: 07/07/1998
  • Est. Priority Date: 02/26/1996
  • Status: Expired due to Term
First Claim
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1. A method for encoding and decoding sound, comprising the steps of:

  • analyzing an input waveform and computing the linear prediction coefficients for a portion of the input waveform;

    classifying the input waveform as one of a group comprising speech and music;

    generating a first plurality of codebooks, each having an output, where each codebook is associated with a frequency band;

    generating at least one first adaptive codebook having an output;

    coupling the output of the first plurality of codebooks and the output of the at least one first adaptive codebook together to create a composite waveform;

    synthesis filtering the composite waveform;

    perceptually weighting the input waveform;

    perceptually weighting the synthesis filtered composite waveform;

    differencing the perceptually weighted synthesis filtered composite waveform from the perceptually weighted input waveform to form an output waveform;

    searching through the first plurality of codebooks and the adaptive codebook to minimize the errors in the output waveform; and

    decoding the output waveform using a second plurality of codebooks and at least one second adaptive codebook.

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