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Coding device and a decoding device

  • US 5,107,519 A
  • Filed: 10/30/1989
  • Issued: 04/21/1992
  • Est. Priority Date: 11/17/1988
  • Status: Expired due to Term
First Claim
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1. A predictive coding device comprising:

  • (a) coding means for outputting a differential code of m bits quantizing a differential value between an input sample value of n bits and a predictive value, m and n being integers, and m being smaller than n;

    (b) local decoding means for outputting a local decoded value of n bits for said input sample value, said local decoded value being determined according to said differential code; and

    (c) predictive means for calculating said predictive value by using said local decoded value,wherein characteristics of said coding means and said local decoding means are set so that a width of a range of values which said local decoded value is permitted to have is narrower than a width of a range of values which said input sample value is permitted to have, irrespective of said input sample value.

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