Automatic recording bias current setting apparatus

Details Automatic recording bias current setting apparatus Automatic recording bias current setting apparatus

1982-10-13

1985-11-12

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 25, G11B 1502, G11B 547

Patent

active

045531790

ABSTRACT:
An automatic recording bias current setting apparatus comprises a bias current generating circuit for generating a bias current with varied level of the bias current, a testing signal generating circuit for generating two kinds of testing signals having different mid and high frequencies of an audio signal, by independently varying the levels of the testing signals, a recording and reproducing circuit for recording the two kinds of testing signals with the bias current onto a magnetic recording medium and reproducing the same, and a bias current detecting circuit for detecting the level of a bias current. The recording and reproducing circuit repeats an operation in which the two kinds of testing signals are recorded onto the magnetic recording medium and then reproduced with independently varied levels of the two kinds of testing signals under the same bias current obtained from the bias current generating circuit, for each of the different varied bias currents. The bias current detecting circuit detects respective reproduced output levels of the two kinds of testing signals with respect to the different bias currents, to detect a bias current level at a point where a difference between respective maximum reproduced output levels becomes equal to a preset predetermined value.

REFERENCES:
patent: 4253122 (1981-02-01), Tabata
patent: 4279005 (1981-07-01), Kitamura et al.
patent: 4344094 (1982-08-01), Ohtake et al.
patent: 4352130 (1982-09-01), Hasegawa et al.
patent: 4422109 (1983-12-01), Sampei et al.
patent: 4433349 (1984-02-01), Kimura

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