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Method, apparatus and character set for encoding and decoding data characters in data carriers, such as RFID tags

  • US 6,422,476 B1
  • Filed: 08/17/1999
  • Issued: 07/23/2002
  • Est. Priority Date: 11/05/1993
  • Status: Expired due to Fees
First Claim
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1. A method of encoding a string of data characters into a wireless, programmable RFID tag, comprising:

  • determining a number of n-bit character codes corresponding to the data characters in the string, the character codes selected from an n-bit set character set that maps a plurality of human readable data characters to respective n-bit character codes, where a subset of the human readable data characters form an m-bit character set that maps the human readable data characters in the subset to respective m-bit character codes, where m is less than n;

    parsing the number of n-bit character codes to separate the n-bit character codes corresponding to the data characters in the subset from the n-bit character codes corresponding to the data characters not in the subset;

    converting the parsed n-bit character codes corresponding to the data characters in the subset into corresponding m-bit character codes, and outputting an output string of the m-bit character codes corresponding to data characters in the subset and the n-bit character codes corresponding to data characters not in the subset to program the RFID tag.

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