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High efficiency encoding method

  • US 5,765,127 A
  • Filed: 12/06/1993
  • Issued: 06/09/1998
  • Est. Priority Date: 03/18/1992
  • Status: Expired due to Term
First Claim
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1. A high efficiency encoding method, comprising the steps of:

  • determining an M-dimensional vector by dividing an input audio signal on a block-by-block basis and performing time domain to frequency domain conversion on at least one block of the signal;

    determining an S-dimensional vector from the M-dimensional vector, where S<

    M, by dividing the components of the M-dimensional vector into plural groups and finding a representative value for each of said groups;

    processing the S-dimensional vector in accordance with a first vector quantization;

    finding a corresponding S-dimensional code vector by inversely quantizing output data of the first vector quantization;

    generating an expanded M-dimensional vector by expanding the S-dimensional code vector;

    determining data expressing a relation between the expanded M-dimensional vector and the original M-dimensional vector, and performing a second vector quantization on said data.

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