Electrical audio signal processing systems and devices – With mixer
Patent
1996-03-04
1997-09-30
Isen, Forester W.
Electrical audio signal processing systems and devices
With mixer
381 92, 381 94, 381122, 381123, 381110, H04B 100
Patent
active
056733275
ABSTRACT:
An automatic microphone control system particularly suited to controlling a small, predetermined number of microphones. A representation of the level of a microphone signal is compared individually to the level representations of each of the other microphones to determine if the microphone should receive a gating trigger. If the microphone level compares favorably to each of the other microphones, and a noise adaptive threshold comparison criterion is also satisfied, then the microphone receives a gating trigger. This triggers a gate ON action for the microphone, which is held at least 0.4 seconds by a one-shot and also locked ON unless a gate ON action is initiated by any other microphone. The circuitry for a two-microphone system particularly suited to a lectern application is powerable by a conventional phantom-powering balanced microphone preamplifier input.
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patent: 4658425 (1987-04-01), Julstrom
patent: 5259035 (1993-11-01), Peters et al.
patent: 5561737 (1996-10-01), Bowen
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