Information recording and reproducing method and apparatus

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing

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369 58, 369 48, 369 62, 386 1, G11B 700

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active

056151926

ABSTRACT:
A recording-reproducing apparatus can remarkably relax the reproduction tracking accuracy by use of a head wider than the track width. The carrier signal frequency assigned to a recording track is designated to a synthesized signal generator. In compliance with this designation, the synthesized signal generator generates a signal of the designated frequency. This carrier signal is amplitude-modulated by the baseband signal to be recorded in a mixer. The unrequired frequency components are removed from this modulation signal by a bandpass filter, and the resulting signal is recorded in a recording medium by a head. The recording medium and the head are in relative motion. In read mode, a track is specified by the carrier signal.

REFERENCES:
patent: 5199021 (1993-03-01), Hatanaka et al.
patent: 5317412 (1994-05-01), Morioka
patent: 5375114 (1994-12-01), Hatanaka et al.
patent: 5432771 (1995-07-01), Shido et al.
patent: 5463604 (1995-10-01), Naito
"Phase-Locked Loops", Dr. Roland E. Best, pp. 216-229, 1984.
"Phaselock Techniques", Floyd M. Gardner, Ph.D., 1966.

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