Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1993-12-15
1996-07-09
Hajec, Donald T.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
360 40, G11B 509
Patent
active
055351875
ABSTRACT:
A system for encoding and decoding binary data in a data transmission system, such as a magnetic or optical data storage channel. The encoding process is implemented as a two-step RLL coding procedure wherein the original user bit data are first encoded as an asymmetric RLL code signal at a reduced clock rate and then translated to a second even-spaced RLL code signal suitable for recording to a data storage medium at a full-speed clock rate. The system also provides for recovering suitable even-spaced RLL codes recorded at a full-speed clock rate, translating the recovered even-spaced RLL code signal to an asymmetric RLL code signal at a reduced clock rate, and then decoding the asymmetric RLL code signal to recover the original user bit data. A preferred embodiment uses a rate 2/5 (2, 16, 2) even-spaced RLL code at a full-speed clock rate and a rate 4/5 (0,7; 1,8) asymmetric RLL code at a half-speed clock rate. The rate 4/5 asymmetric RLL code has a high capacity and the rate 2/5 even-spaced RLL code has a wide detection window. The intercode translation procedure requires only simple time-delay circuitry.
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Melas Constantin M.
Rugar Daniel
Sutardja Pantas
Wood Roger W.
Hajec Donald T.
Intenational Business Machines Corporation
Le Thien Minh
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