M=10 (3,6) runlength limited code for multi-level data

Details M=10 (3,6) runlength limited code for multi-level data M=10 (3,6) runlength limited code for multi-level data

1995-05-12

1997-09-02

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

056637225

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=10 (3,6) code provides high density recording to a multi-level storage medium. The M=10 (3,6) encoder is implemented using a fourteen-state encoder and a modulo ten waveform encoder.

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