Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1981-07-10
1984-02-21
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 31, G11B 547, G11B 2736
Patent
active
044333498
ABSTRACT:
A bias control apparatus for a tape recorder includes a signal source circuit for generating first and second signals, a bias signal generating circuit for providing a composite bias signal containing a frequency component of the second signal, a recording circuit for recording into a recording tape a recording current corresponding to the composite bias signal and the first signal, a playback circuit for taking out a third signal from said recording tape, the third signal containing a signal component corresponding to the first and second signals, a detecting circuit for detecting a fourth signal corresponding to an amplitude component of the second signal from the third signal in synchronism with the second signal, and a control means for changing a magnitude of the composite bias signal on the basis of the fourth signal. The bias signal generating circuit, the recording circuit, the playback circuit, the detecting circuit, and the control circuit cooperatively make up a servo loop for controlling the composite bias signal to have a given magnitude.
REFERENCES:
patent: 4247875 (1981-01-01), Takahashi
patent: 4253122 (1981-02-01), Tabata
patent: 4258397 (1981-03-01), Kitamura et al.
patent: 4279005 (1981-07-01), Kitamura et al.
Canney Vincent P.
Olympus Optical Co,. Ltd.
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