Digital data modulation/demodulation system wherein the modulate

Details Digital data modulation/demodulation system wherein the modulate Digital data modulation/demodulation system wherein the modulate

1994-04-01

1996-11-26

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 58, H03M 700

Patent

active

055790038

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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Dialog.RTM. File INSPEC Abstract B91040192; Osawa et al.; Application of new variable-length block code and Viterbi decoding using d-constraint to magneto optical recording: Journal of Institute of Television Engineers of Japan; vol. 44, No. 10, pp. 1369-1375; Oct. 1990.
Sakamoto, et al, "Signal Processing of the Compact-Cassette Digital Recorder", J. Audio Eng. Soc., vol. 32, No. 9, pp. 647-658, Sep. 1984.
Fujiwara et al, "Essentials of Error-Control Coding Techniques", Academic Press, Inc., 1990, pp. 235-237.
Patent Abstracts of Japan, vol. 8, No. 75 (P-266) Apr. 1984 re JP-A-58-220,211.

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