Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1989-05-18
1992-06-16
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 40, 341 58, G11B 509, H03M 500
Patent
active
051229129
ABSTRACT:
An apparatus for processing an input data signal has a generator providing a plurality of pseudo-random signals each of which scrambles the input data signal for providing a plurality of respective scrambled outputs, a detector by which a DC component, such as, a run-length or a digital sum value, is detected for each of the scrambled outputs, and a selector responsive to the detector for selecting one of the scrambled outputs, for example, having a minimum run-length or a digital sum value closest to zero. An identifying signal identifying the pseudo-random signal used in scrambling the selected scrambled output is then transmitted with the latter, for example, by recording on a magnetic tape. When the transmitted signal is received or reproduced, the identifying signal included with it is detected, and the received signal is descrambled with a pseudo-random signal corresponding to the detected identifying signal.
REFERENCES:
patent: 4301537 (1981-11-01), Roos
Kanota Keiji
Nagai Michio
Frommer William S.
Kim Won Tae C.
Psitos Aristotelis
Sinderbrand Alvin
Sony Corporation
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