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Method and apparatus for speech excitation waveform coding using multiple error waveforms

  • US 5,809,459 A
  • Filed: 05/21/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 05/21/1996
  • Status: Expired due to Term
First Claim
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1. A method for encoding speech comprising the steps of:

  • a) generating an excitation waveform by performing a linear prediction coding (LPC) analysis on a number of samples of input speech and inverse filtering the samples of input speech;

    b) selecting a source segment of the excitation waveform;

    c) computing a target segment as a representative portion of the excitation waveform, wherein the target segment represents a fundamental period of the excitation waveform;

    d) computing orthogonal error waveforms by computing at least one model, at least one model reference, and comparing the at least one model reference and the at least one model;

    e) encoding the orthogonal error waveforms and parameters describing the input speech; and

    f) creating a bitstream which includes encoded versions of the orthogonal error waveforms and the parameters.

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