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Vector quantizing apparatus

  • US 5,677,986 A
  • Filed: 05/26/1995
  • Issued: 10/14/1997
  • Est. Priority Date: 05/27/1994
  • Status: Expired due to Term
First Claim
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1. A vector quantizing apparatus comprising:

  • means for receiving a set of first basis vectors corresponding to a pre-stage output;

    means for receiving a target vector;

    means for calculating an approximate vector approximate to a target on the basis of the set of first basis vectors and the target, and calculating a residual vector corresponding to a difference between the target vector and the approximate vector;

    code vector means for outputting a set of code vectors;

    selecting means for selecting at least one code vector from the set of code vectors;

    means for producing a set of second basis vectors on the basis of the code vector selected by said selecting means and the set of first basis vectors;

    searching means for searching, from the set of code vectors, for the code vectors which allow to increase a magnitude of a projection vector obtained by projecting the residual vector in a vector space formed by the set of second basis vectors; and

    means for outputting information specifying the code vectors searched by said searching means.

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