Balance control circuit

Details Balance control circuit Balance control circuit

1991-06-26

1992-11-17

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

381109, 333 171, 333 81R, 307264, 307553, 307562, H04S 100, H03G 300

Patent

active

051650991

ABSTRACT:
The balance of the volumes in right and left channels in a stereo play back system is controlled. The amount of attenuation of an attenuator provided in each channel is controlled. When the levels of right and left stereo signals are judged to be approximately the same, an oscillator is permitted to oscillate and the pulses from the oscillator are counted by a counter. In accordance with a voltage signal which corresponds to the level ratio of the right and left stereo signals, whether the counter must count upwards or downwards is determined. The balance is controlled in accordance with the amount of attenuation of each attenuator which is determined in accordance with the decoded count value. The completion of the control is detected when the level ratio of the right and left stereo signals alternately change after they become substantially equal, and the control is automatically finished. When the control is finished, the counter is reset so as to facilitate balance control when the source of the stereo signals is changed.

REFERENCES:
patent: 4123626 (1978-10-01), Munter
patent: 4239937 (1980-12-01), Kampmann
patent: 4503554 (1985-03-01), Davis
patent: 4905291 (1990-02-01), Strickland
patent: 4926485 (1990-05-01), Yamashita
patent: 5046107 (1991-09-01), Iwamatsu

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