04413251 is referenced by 74 patents and cites 3 patents.

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.

Title
Method and apparatus for generating a noiseless sliding block code for a (1,7) channel with rate 2/3
Application Number
6/283758
Publication Number
4413251
Application Date
July 16, 1981
Publication Date
November 1, 1983
Inventor
John P Moussouris
Ossining
NY, US
Martin Hassner
Ossining
NY, US
Roy L Adler
Ossining
NY, US
Agent
Roy R Schlemmer
Assignee
International Business Machines Corporation
NY, US
IPC
H03K 13/00
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