Electrical audio signal processing systems and devices – Dereverberators
Patent
1992-04-10
1994-03-22
Ng, Jin F.
Electrical audio signal processing systems and devices
Dereverberators
381 92, 381 81, 379206, H04B 320, H04B 300, H04R 300, H04M 342
Patent
active
052972100
ABSTRACT:
An improved automatic microphone actuation control system. The system exhibits a high degree of resistance to inappropriate secondary microphone actuation by reverberant sound, even when two or more microphones in a system are operated at significantly different electroacoustic gains. The system further exhibits improved actuation sensitivity to local conference room speech occurring simultaneously with teleconference loudspeaker sound which is strongly coupled acoustically to the microphones. A Reverb Inhibit Bus, which is the maximum of a reduced level speaker inhibit signal and substantially attenuated versions of the DC microphone signal level representations, drives the microphone channels' noise adapting threshold circuitry. Such circuitry is driven in a manner to inhibit microphone actuation for teleconference loudspeaker sound reverberation and reverberation of local conference room speech which has already actuated a microphone. Further, a stronger level speaker inhibit signal is applied to each microphone channel through a direct inhibit bus. This inhibits microphone actuation by directly coupled loudspeaker sound, while not modifying the noise adapting threshold.
REFERENCES:
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4600815 (1986-07-01), Horna
patent: 4658425 (1987-04-01), Julstrom
patent: 4991166 (1991-02-01), Julstrom
Lee P. W.
Ng Jin F.
Shure Brothers Incorporated
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