Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1988-12-09
1991-02-05
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 32, G11B 502, G11B 500, G11B 509
Patent
active
049910345
ABSTRACT:
A direct current restoration circuit in a digital VTR restores a low frequency component as a cut off in an input digital signal. The direct current restoration circuit has a feedback loop having variable gain. This gain is controlled according to a level of the signal obtained by adding an input signal and a signal as feed back. Therefore, the gain of the feedback loop can be precisely controlled irrespectively of wandering of the base line of the input signal. In addition, the feedback loop is cut off over a predetermined period including the time of switching of a magnetic head, so that waveform distortion at the time of switching can be prevented from being enlarged by the direct current restoration circuit. Additionally, the gain of the feedback loop is changed according to switching of the magnetic head, so that the low frequency component can be suitably compensated for each respective reproducing channel.
REFERENCES:
patent: 3264569 (1966-04-01), Lefferts
patent: 4692914 (1987-09-01), Yasumura et al.
Psitos Aristotelis M.
Sanyo Electric Co,. Ltd.
Sheladia Varsha V.
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