Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1980-10-27
1982-02-23
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 61, G11B 502
Patent
active
043171427
ABSTRACT:
A recorder for the recording and the playback of analog information on a movable magnetic medium, e.g. a magnetic tape, has a limiter for reducing the gain of the record section in response to excessive input amplitudes, has a playback section that cancels noise which the transducer unit picks up, and has a muting circuit that diminishes playback gain during certain operations.
The recorder applies the limiting function to the compressor portion of a dynamic compandor and applies the muting control to the expandor portion of the compandor.
The noise cancellation introduces a relative phase reversal to noise present with different playback signals, and sums selected portions of those signals to cancel the noise.
REFERENCES:
patent: 3832044 (1974-08-01), Deeran
patent: 3843573 (1974-10-01), Kosaka
patent: 3856387 (1974-12-01), Wray et al.
patent: 3937902 (1976-02-01), Dorren
patent: 3959817 (1976-05-01), Honjo et al.
patent: 4004293 (1977-01-01), Osburn
"The Hi-Fi Book" published by Stereo Components Systems Inc.
"Signetics Analog Date Manuel"--Signetics Corp., Sunnyvale, Calif.
Canney Vincent P.
Polaroid Corporation
Roman Edward S.
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