Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1993-10-22
1995-11-21
Hajec, Donald T.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
G11B 5035
Patent
active
054693063
ABSTRACT:
A digital signal reproducing apparatus comprising a magnetic head for reading a video signal from a magnetic tape, a rotary transformer, a reproduction amplifier, a reproduction equalizer, a phase-locked loop, a threshold discriminator, and an amplitude detector. The amplitude detector detects a dropout by threshold-discriminating the nonequalized reproduced signal, and the frequency characteristic of the equalizer is changed in response to detection of any dropout so as to compensate for the dropout. The threshold discriminator detects the reproduced digital signal from the equalized reproduced signal in accordance with a clock signal extracted by the phase-locked loop. The apparatus is capable of reproducing an errorless video signal by compensating for any dropout on the magnetic tape. There is also disclosed a digital signal reproducing method which detects the existence of any dropout when the amplitude of the read signal has become smaller than a predetermined value, and changes the characteristic of the equalizer to compensate for the dropout.
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Frommer William S.
Hajec Donald T.
Le Thien Minh
Sinderbrand Alvin
Sony Corporation
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