Digitally controlled automatic bias circuit for magnetic recordi

Details Digitally controlled automatic bias circuit for magnetic recordi Digitally controlled automatic bias circuit for magnetic recordi

1979-11-01

1981-07-21

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 547

Patent

active

042801532

ABSTRACT:
A digital circuit for generating a linearly increasing signal is provided for controlling the level of a recording A. C. bias signal. The digitally controlled bias signal is mixed with an analog signal of a known frequency and constant level and recorded. The circuit detects and stores a recording bias level corresponding to a reproduce signal envelope level, equal to an obtained peak level adjusted with respect to a known overbias level. The circuit compensates the detected recording bias level with respect to distance between the recording and reproducing heads to obtain an optimum recording bias level. The detected bias level remains stored and unchanged during power supply interruption.

REFERENCES:
patent: 4011585 (1977-03-01), Sunaga
patent: 4038692 (1977-07-01), Umeda et al.
patent: 4092678 (1978-05-01), Nishikawa

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