Circuitry for adjustment of biasing current for recording sound

Details Circuitry for adjustment of biasing current for recording sound Circuitry for adjustment of biasing current for recording sound

1979-04-12

1981-01-27

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 25, G11B 547, G11B 502

Patent

active

042478758

ABSTRACT:
A circuitry has a calibration signal generator, a higher frequency range output level adjusting circuit and a recording bias current adjusting variable resistor. The signal generator continually alternately gives output two kinds of calibration signals of lower and higher frequencies. The higher range adjusting circuit is operatively connected with the variable resistor, and adjusts output sound level, as indicated at an indicator, only of the higher frequency signal of the two calibration signals.

REFERENCES:
patent: 2791640 (1957-05-01), Wolfe
patent: 3564160 (1971-02-01), Temes
patent: 3798673 (1974-03-01), Koinumo
patent: 4011585 (1977-03-01), Sunaga
patent: 4038692 (1977-07-01), Umeda et al.

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