Method and apparatus for generating a noiseless sliding block co

Details Method and apparatus for generating a noiseless sliding block co Method and apparatus for generating a noiseless sliding block co

1981-07-16

1983-11-01

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1300

Patent

active

044132514

ABSTRACT:
An algorithm and the hardware embodiment for producing a run length limited code useful in magnetic recording channels are described. The system described produces sequences which have a minimum of 1 zero and a maximum of 7 zeros between adjacent 1's. The code is generated by a sequential scheme that map 2 bits of unconstrained into 3 bits of constrained data. The encoder is a finite state machine whose internal state description requires 3 bits. It possesses the attractive feature of reset data blocks which reset it to a fixed state. The decoder requires a lookahead of two future channel symbols (6 bits) and its operation is channel state independent. The error propagation due to a random error is 5 bits. The hardware implementation is extremely simple and can operate at very high data speeds.

REFERENCES:
patent: 3689899 (1972-09-01), Franaszek
patent: 3906485 (1975-09-01), Hong
patent: 3995264 (1976-11-01), Ouchi
Adlr "Memoirs of the American Mathematical Society" Jul. 1979 vol. 20 No. 219.

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