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Data compression method, data retrieval method, data retrieval apparatus, recording medium, and data packet signal

  • US 20010022792A1
  • Filed: 01/22/2001
  • Published: 09/20/2001
  • Est. Priority Date: 01/25/2000
  • Status: Abandoned Application
First Claim
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1. A data compression method for efficiently retrieving key data for retrieving main data and compressing a data amount of said key data to be recorded on a recording medium, comprising the steps of:

  • comparing first key data composed of a first number of characters with second key data composed of a second number of characters which is greater than said first number of characters of said first key data;

    on the basis of a result of the comparison between said first key data and said second key data, detecting the number of matching characters between said first key data and said second key data, deleting a character matching said first key data from said second key data, and generating a data packet having said number of matching characters and a mismatching character obtained by deleting said character matching said first key data from said second key data; and

    recording said data packet to said recording medium.

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