Priority mixer control

Details Priority mixer control Priority mixer control

1978-05-04

1979-04-10

Cooper, William C.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330124R, 330295, 179 1AT, H04M 356

Patent

active

041490320

ABSTRACT:
A priority mixer control for a multi-microphone audio system comprises a threshold signal generator that develops a scanning D.C. threshold signal starting at a maximum level for a time T1 and then decreasing in amplitude as a function of time. Each microphone channel is provided with a control channel including a comparator that compares the microphone signal, as an A.C. signal, with the threshold signal, and that switches the microphone channel to "on" condition when the microphone signal exceeds the threshold; all of the control channels are coupled to a threshold signal restoration means that drives the threshold signal back to its maximum level each time an audio channel is switched "on". An audio channel that has been switched "on" remains "on" for a time T2 substantially longer than the time T1. The number of channels currently in "on" condition is continuously monitored and the output gain is reduced whenever two or more channels are in "on" condition.

REFERENCES:
patent: 3439121 (1969-04-01), Mitchell
patent: 4090032 (1978-05-01), Schrader

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