Method and apparatus for processing digital signals prior to recording
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
May 12, 1986
filing date -
Sep 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of processing digital information prior to recording comprises converting input digital words into code words, each of the same period as the input digital word but containing a greater number of time slots than the number of bit locations in the digital word, providing a plurality of groups of code words and selecting the group from which a code word will be taken in any instance on the basis of the immediately preceding code word. The code words are defined such that there is a minimum spacing of three time slots between transitions and no transition is permitted in the last time slot. Two main groups of code words are provided which each have a transformed version. Apparatus for carrying out the method as described as is apparatus for decoding the encode words in replay.
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