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Digital data compression method and means

  • US 4,706,264 A
  • Filed: 06/22/1983
  • Issued: 11/10/1987
  • Est. Priority Date: 06/22/1983
  • Status: Expired due to Fees
First Claim
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1. The method of compressing a digital data stream composed of plaintext symbols comprising the steps ofA. maintaining a code table of plaintext symbols at a transmitting location;

  • B. encoding blocks of plaintext symbols in the stream using said code table to produce codes for said blocks;

    C. updating said code table according to an update algorithm;

    D. transmitting the codes for said blocks plus only plaintext symbols in blocks not previously encoded to a receiving location;

    E. maintaining a code table at the receiving location;

    F. decoding the transmitted codes for said blocks using the code table at the receiving location to recover plaintext symbols in the data stream; and

    G. updating the receiving location code table by applying to the plaintext symbols received from the transmitting location the same update algorithm used at the transmitting location so that the two code tables remain identical whereby the coded symbol blocks in the transmission can be decoded continuously at the receiving location without requiring the separate transmission of codes for said not previously encoded blocks to update the receiving location code table.

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