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Coding apparatus having adaptive coding at different bit rates and pitch emphasis

  • US 5,878,387 A
  • Filed: 09/29/1995
  • Issued: 03/02/1999
  • Est. Priority Date: 03/23/1995
  • Status: Expired due to Term
First Claim
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1. A coding apparatus comprising:

  • an input terminal to which an input signal is supplied;

    an adaptive codebook for storing excitation signals as vectors;

    a synthesis filter for forming a synthesis signal from the vectors stored in the adaptive codebook;

    similarity calculation means for calculating a similarity between the synthesis signal obtained by the synthesis filter and an input signal;

    coding scheme determining means for determined one coding scheme from a plurality of coding schemes respectively having coding bit rates different from each other, on the basis of the similarity obtained by the similarity calculation means; and

    coding means for coding the input signal in accordance with the coding scheme determined.

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