Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1976-02-13
1977-03-15
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 51, G11B 500
Patent
active
040127850
ABSTRACT:
A playback circuit for use with a magnetic recording transducer, in a magnetic recording apparatus, the transducer developing an alternating current readback signal having alternating positive and negative peaks, the playback circuit comprising a differentiator responsive to the readback signal and operative to produce a differentiated signal having first and second polarities and having zero crossings in time coincidence with the positive and negative peaks, a bidirectional one-shot device responsive to the differentiated signal and operative to produce a first bistate signal having transitions in time coincidence with the zero crossings and to produce a second signal comprising a sequence of pulses having leading edges that correspond in time to the zero crossings and having trailing edges that lag the leading edges by a predetermined time interval, a latch for producing a third signal having transitions that correspond in time to the trailing edges and having a level that corresponds to the level of the first signal at such time, and for producing a fourth signal that is the complement of the third signal, two one-shot devices responsive to the third and fourth signals and operative to produce fifth and sixth signals including pulses corresponding to the positive going transitions of the third and fourth signals, and an OR gate operative to conduct the pulses to an output terminal, the conducted pulses corresponding to the positive and negative peaks of the readback signal.
REFERENCES:
patent: 3404391 (1968-10-01), Chur
patent: 3577192 (1971-05-01), Schlaeper
patent: 3581297 (1971-05-01), Behr et al.
patent: 3623040 (1971-11-01), Erikson
patent: 3699554 (1972-10-01), Jones
patent: 3711843 (1973-01-01), Galvagni et al.
Canney Vincent P.
Shugart Associates, Inc.
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