Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-03-14
1990-03-27
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 46, G10L 506
Patent
active
049127675
ABSTRACT:
A method and system for cancelling noise from sources that are distributed over a region, whereby two sensors are located so that a first sensor will detect both voice signals and noise signals, and a second sensor will detect only the noise signals. The voice signals picked up at the second sensor are negligible, and the noise signals picked up at both sensors are correlated. The signals output from each sensor are connected to a predetermined number of narrowband filters in order to divide each respective signal into a predetermined number of frequencies, such as 15 for example. Thereafter, both signals are combined to cancel effectively the noise component from the signal output having both voice and noise to leave a voice signal that is substantially noise free.
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Parsons, "Voice and Speech Processing", McGraw-Hill, 1976, pp. 345-369.
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Harrison, "Adaptive Noise Cancellation in a Fighter Cockpit Environment", IEEE, 1984, pp. 18A.4.1-18A.4.4.
Clarkson Douglas M.
Harkcom Gary V.
International Business Machines - Corporation
Merecki John A.
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