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Method and apparatus for compressing a digital signal using vector quantization

  • US 5,592,227 A
  • Filed: 09/15/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 09/15/1994
  • Status: Expired due to Fees
First Claim
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1. A method for compressing a digital signal to produce a compressed signal stream, comprising the steps of:

  • providing a first table of vectors having a first degree of intraframe signal correlation and a second table of vectors having a second degree of intraframe signal correlation, referred to as a class-1 table and a class-2 table respectively;

    dividing said digital signal into a series of segments, each segment comprising a plurality of digital signal values;

    determining a first vector Xbar1 for a selected segment having said first degree of intraframe signal correlation for the signal values in said selected segment;

    determining a second vector Xbar2 for said selected segment having said second degree of intraframe signal correlation for the signal values in said selected segment;

    finding an entry in said class-1 table that is a best match for said vector Xbar1, referred to as a class-1 best match entry;

    finding an entry in said class-2 table that is a best match for said vector Xbar2, referred to as a class-2 best match entry;

    inserting into said compressed signal stream an identifying code, said identifying code representing a selected one of said class-1 best match entry or said class-2 best match entry.

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