Coded data generation or conversion – Digital code to digital code converters – To or from run length limited codes
Patent
1995-05-12
1998-05-05
Hoff, Marc S.
Coded data generation or conversion
Digital code to digital code converters
To or from run length limited codes
341 56, H03M 700
Patent
active
057481172
ABSTRACT:
A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder encodes the digital input data to produce a plurality of code symbols, where each code symbol is at one of M levels and each pair of non-zero code symbols is separated by at least d but no more than k zeros. A waveform encoder converts the code symbols into waveform signal amplitudes compatible with a multi-level channel. Each waveform signal amplitude is generated by modulo M addition of a current code symbol with a previous waveform signal amplitude. A specific M=8(1,3) code provides high density recording to a multi-level storage medium. The M=8(1,3) encoder is implemented using a two-state encoder and a modulo eight waveform encoder.
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Hoff Marc S.
Optex Corporation
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