Bias level setting circuit for tape recorders with staircase hig

Details Bias level setting circuit for tape recorders with staircase hig Bias level setting circuit for tape recorders with staircase hig

1979-03-28

1980-09-02

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 547

Patent

active

042209790

ABSTRACT:
An automatic bias level setting circuit for tape recorders includes a variable loss attenuator for stepwisely increasing the level of a high frequency bias signal which is superposed on a constant amplitude audio test signal. The recorded signal is detected by means of an envelope detector coupled to the playback head and fed into a resettable integrator for integrating the input signal in response to each stepwise variation of the signal to generate a series of sawtooth waves. The output of the integrator is coupled to a maximum peak detector to detect the maximum peak point of the recorded test signal to determine an optimum bias level in relation to the detected peak point.

REFERENCES:
patent: 4011585 (1977-03-01), Sunzga
patent: 4038692 (1977-07-01), Umeda et al.

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