Method of and device for automatic bias control

Details Method of and device for automatic bias control Method of and device for automatic bias control

1995-12-06

1998-02-17

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Checking record characteristics or modifying recording...

360 65, 360 66, 360 31, G11B 502, G11B 503, G11B 5035

Patent

active

057197164

ABSTRACT:
A method of controlling a bias current required to record an audio signal on a recording medium includes the steps of: recording a test signal having a frequency component higher than a predetermined frequency on the recording medium and reproducing the recorded test signal from the recording medium; determining a reference amount of the bias current variation on the basis of the level of the reproduced test signal; determining a bias current variation characteristic of the recording medium on the basis of the reference amount; and varying the bias current in accordance with a level change of a high frequency component of the audio signal by referring to the bias current variation characteristic during a recording of the audio signal.

REFERENCES:
patent: 4220979 (1980-09-01), Kitamura et al.
patent: 4279005 (1981-07-01), Kitamura et al.
patent: 4422109 (1983-12-01), Sampei et al.
patent: 4553179 (1985-11-01), Nami et al.

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