Automatic microphone mixer

Details Automatic microphone mixer Automatic microphone mixer

1975-05-09

1976-11-16

Claffy, Kathleen H.

325404, 179 1VL, H04M 160

Patent

active

039925846

ABSTRACT:
In a sound reinforcement system having a plurality of input channels and input signal sources and at least one output channel, a gain control apparatus is provided for controlling the gain applied to the signals in each channel whereby the total gain of the system remains constant. Gain changes in each channel are proportional to signal ratios such that the automatic gain variations in all channels are always complementary. In a preferred embodiment, the control apparatus comprises means for providing a reference signal having a magnitude proportional to the sum of the amplitudes of the signals in the channels and a plurality of control signals each of which has a magnitude proportional to the amplitude of the signal in a respective one of said channels, and a plurality of attenuating means, each of which is responsive to the ratio of the corresponding one of said control signals to the reference signal.

REFERENCES:
patent: 3160707 (1964-12-01), Meyers
patent: 3296532 (1967-01-01), Robinson
patent: 3629718 (1971-12-01), Klein
patent: 3755625 (1973-08-01), Maston
patent: 3814856 (1974-06-01), Dugan
patent: 3893038 (1975-07-01), Omata

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