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Method and apparatus for speech compression using multi-mode code excited linear predictive coding

  • US 5,602,961 A
  • Filed: 05/31/1994
  • Issued: 02/11/1997
  • Est. Priority Date: 05/31/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for processing an input signal, said input signal including a frame, said apparatus comprising:

  • a first circuit coupled to receive a first signal, said first signal corresponding to said input signal, said first circuit for generating a first set of parameters corresponding to said frame;

    a second circuit coupled to receive said first signal and said first set of parameters, said second circuit for generating a second signal;

    a pulse train analyzer, coupled to said second circuit, said pulse train analyzer for generating a first match value, a second set of parameters, and a first excitation value;

    a fourth circuit, coupled to said second circuit, said fourth circuit for generating a second match value, a third set of parameters, and a second excitation value, said fourth circuit including an adaptive codebook and an adaptive codebook analyzer, said adaptive codebook being coupled to said adaptive codebook analyzer;

    a fifth circuit, coupled to said pulse train analyzer and said fourth circuit, for determining a set of admissible excitation search modes based upon a prior excitation search mode, and said fifth circuit further for selecting an excitation search mode from said set of admissible excitation search modes;

    a sixth circuit, coupled to said fifth circuit, for selecting a selected set of parameters and a selected excitation corresponding to said excitation search mode, anda seventh circuit, coupled to said first circuit and said sixth circuit, for generating an encoded signal responsive to said selected set of parameters and said excitation search mode.

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