Digital data modulation/demodulation system wherein the modulated data satisfies a minimum run number of zeros
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United States of America Patent
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Nov 26, 1996
Grant Date -
N/A
app pub date -
Apr 1, 1994
filing date -
Apr 2, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital data modulation system having, a separator for separating a consecutive binary data sequence to four-bit code-words, a four-to-nine ([4,9]) converter for converting the four-bit code-words into nine-bit modulated code-words and a code selector for selecting a code among nine-bit code-words containing minimum three bits of '0' between a preceeding bit of '1' and its following bit of '1' so that there should not be less than two consecutive bits of '0' between a selecting code and a modulated code-word which is to be converted later by the [4,9] converter.
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