Apparatus for encoding unconstrained data onto a (1,7) format wi

Details Apparatus for encoding unconstrained data onto a (1,7) format wi Apparatus for encoding unconstrained data onto a (1,7) format wi

1981-12-31

1984-12-11

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

360 40, H03K 1324

Patent

active

044881428

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 maps 2 bits of unconstrained into 3 bits of constrained data. The encoder is a finite state machine whose internal state description requires 3 bits. The encoder requires a lookahead of one future input vector (2 bits) and a look back at the last channel bit generated during the immediately preceding encoding operation. The error propagation due to a random error is, at most, 4 bits in bursts of 5. 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: 4413251 (1983-11-01), Adler

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