Apparatus for correcting a pick-up signal of a digital magnetic

Details Apparatus for correcting a pick-up signal of a digital magnetic Apparatus for correcting a pick-up signal of a digital magnetic

1992-11-06

1995-07-25

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 46, G11B 5035, G11B 509

Patent

active

054367719

ABSTRACT:
A playback equalizing circuit of a digital magnetic recording and reproducing apparatus including a signal processing unit for equalizing, delaying and waveform-shaping a signal picked-up from a magnetic tape via a playback head, a signal outputting unit for comparing a signal processed in the signal processing unit and a predetermined reference signal and outputting the comparison, and a reference signal controlling unit for responding to the level of the picked-up signal and controlling the reference signal in a variable-speed playback mode. The circuit responds to the level variation of a playback signal and controls a reference voltage to improve playback characteristics during such variable-speed reproducing as a high-speed search. In another embodiment, the playback equalizing circuit includes an envelope detecting circuit for detecting the envelope level of a picked-up signal, and an AGC unit for controlling the gain of the envelope level detected from the envelope detecting circuit.

REFERENCES:
patent: 4774601 (1988-09-01), Ouchi et al.
patent: 4809090 (1989-02-01), Suzuki
patent: 5050002 (1991-09-01), Suzuki et al.
patent: 5134528 (1992-07-01), Sato

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