RLL encoder and decoder with pipelined plural byte processing

Details RLL encoder and decoder with pipelined plural byte processing RLL encoder and decoder with pipelined plural byte processing

1991-07-12

1993-01-05

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

360 40, H03M 700

Patent

active

051774828

ABSTRACT:
For encoding a stream of k-bit data bytes into a stream of m-bit code bytes satisfying given constraints, a coding principle and coder apparatus are disclosed which allow pipelined and parallel handling of the byte stream. Each data byte DB and an associated coder state indicator S are together converted into a code byte CB. The coder state indicator S(i) to be associated with a data byte DB(i) is obtained by logically combining the coder state indicator S(i-1) of the preceding data byte DB(i-1) and a state transition indicator T(i-1) derived from the latter. This allows the simultaneous generation of all coder state indicators S for a whole group (a word) of data bytes, thereby enabling the parallel and pipelined operation of the coder.

REFERENCES:
patent: 3995264 (1976-11-01), Ouchi
patent: 4486739 (1984-12-01), Franaszek et al.
patent: 4551773 (1985-11-01), Cohn et al.
patent: 4617552 (1986-10-01), Kojima et al.
patent: 4684921 (1987-08-01), Fok et al.
patent: 4688016 (1987-08-01), Fok
patent: 4864303 (1989-09-01), Ofek

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