Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1983-05-02
1987-01-06
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 46, G11B 509
Patent
active
046351400
ABSTRACT:
In a digital signal recording and playback system, digital data is provided by the pulse code modulation of an analog signal. The digital data is modulated into a digital signal in such a manner as to have a maximum reversal interval equal to the bit period of the original data and a minimum reversal interval equal to one half the bit period. Such a digital signal is recorded into and reproduced out of a recording medium. During recording, frequencies are selected for a first or high frequency component which repeats at the minimum reversal interval and a second or low frequency component which repeats at the maximum reversal interval, such that the playback level of the first frequency component becomes sufficiently lower than that of the second. During playback, the first frequency component is further attenuated relative to the second or fully removed and the playback level or the slice level is controlled with regard to the second component of the reproduced digital signal.
REFERENCES:
patent: 3597751 (1971-08-01), Heidecker et al.
patent: 3603945 (1971-09-01), Hertrich
patent: 3725646 (1973-04-01), Smead
patent: 3794987 (1974-02-01), Wabearn
patent: 3864735 (1975-02-01), Davis et al.
patent: 4183066 (1980-01-01), Anderson
patent: 4376958 (1983-03-01), Pettigrew
Canney Vincent P.
Victor Company of Japan , Limited
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