Biased pulsed recording systems and methods

Details Biased pulsed recording systems and methods Biased pulsed recording systems and methods

1979-12-07

1982-02-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 46, 360 65, 360 68, G11B 2110, G11B 509

Patent

active

043142893

ABSTRACT:
A short duration pulse is recorded for each transition of a data bit stream. Such short duration pulses are AC bias recorded for enhancing recorder operations. The recording is preferably used with a buried control signal; the system enables simultaneous recording of data with reading or sensing the control signals. Specific equalization and detection techniques are disclosed. A DC restoring detector, operating synchronously to a detected bit stream, continually adapts its operation to readback signal amplitude variations. Because of high frequency aspects, the circuit elements can be mounted immediately adjacent a transducer or as close thereto as possible.

REFERENCES:
patent: 3032612 (1962-05-01), Goldmark
patent: 3070670 (1962-12-01), Eldridge et al.
patent: 3228016 (1966-01-01), Hopner
patent: 3404392 (1968-10-01), Sordello
patent: 3438018 (1969-04-01), Braun
patent: 3641524 (1972-02-01), Norris
patent: 3952329 (1976-04-01), Dent et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4202017 (1980-05-01), Gefton et al.

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