Electrical audio signal processing systems and devices – One-way audio signal program distribution – Multiple channel
Patent
1986-06-30
1987-04-14
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Multiple channel
381 92, 381111, 381107, 379206, H04R 300
Patent
active
046584250
ABSTRACT:
A microphone and loudspeaker arrangement for use in a teleconference system, wherein a plurality of microphones are held in a fixed relationship to a loudspeaker. The microphones are independently gated ON in response to (1) speech picked up by the microphone, (2) a loudspeaker signal driving the loudspeaker and (3) an electrical signal related to the microphone signals of the other associated microphones. A noise adapting threshold circuit generates a voltage level representative of background noise which is compared with the microphone signal of a respective microphone for determining whether the microphone is receiving speech. A decisional circuitry monitors the microphone signal of the associated microphone with respect to a MAX bus which carries microphone signals representative of the level of microphone signals at the other microphones. The decisional circuitry generates a signal indicating that the associated microphone is the first loudest microphone signal.
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S. Julstrom and T. Tichy, "Direction-Sensitive Gating . . .", J. Audio Eng. Soc., vol. 32, No. 7/8, Jul. 1984, pp. 490-506.
Rubinson Gene Z.
Schroeder L. C.
Shure Brothers Inc.
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