Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Patent
1992-04-09
1994-03-01
Isen, Forester W.
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
381119, 381 57, H03G 300
Patent
active
052915581
ABSTRACT:
An ambiance channel produces an ambiance audio signal as a reference threshold such as from a noise microphone located away from the program microphones. Variable gain amplifiers in a plurality of program channels selectively gate open those program channels that have audio present exceeding the ambiance threshold. When the program channels are below the noise threshold and hence inactive, they are gated off and the background noise in the ambiance channel is shunted around the program channel to the output. A control function circuit adjusts the gain of each of the program channels that have been opened as an inverse function of the number of open mics (called NOM). In another disclosed embodiment, a programmed microcomputer receives as inputs the status signals that represent the gated open or gated off conditions of the program channels. These status signals are processed by a software program in the microcomputer that performs both the functions of gating open individual program channels relative to the background noise level, and setting the gain of each of the program channels according to the NOM function.
REFERENCES:
patent: 3160707 (1964-12-01), Meyers
patent: 3296532 (1967-01-01), Robinson
patent: 3629718 (1971-12-01), Klein et al.
patent: 3755625 (1973-08-01), Maston
patent: 3814856 (1974-06-01), Dugan
patent: 3893038 (1975-07-01), Omata et al.
patent: 3992584 (1976-11-01), Dugan
patent: 4864627 (1989-09-01), Dugan
patent: 4885792 (1989-12-01), Christensen et al.
Dugan, Daniel W., Adaptive Threshold Automatic Microphone Mixing System Becomes Public Domain, presented at the 90th Convention of the Audio Engineering Society (New York) Feb. 19-22, 1991 in Paris.
Precision Monolithics, Inc., SSM-2120/SSM-2122, Dyamic Range Processor/Dual VCA, Rev. B, Issued Feb. 1990.
Dugan, Dan, Family Tree of the Automatic Microphone Mixers, Jun. 6, 1988.
Isen Forester W.
Rane Corporation
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