Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1997-06-04
2000-08-22
Chang, Vivian
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 93, 381 77, H04R 2700
Patent
active
061084271
ABSTRACT:
The present invention is embodied in a method and apparatus for eliminating audio feedback which includes an active microphone coupled to an amplifier which transmits signals received at the active microphone to a parametric speaker for broadcasting. The apparatus comprises at least one transducer for detecting at least one sonic frequency and generating an electrical signal representative of the at least one sonic frequency, a processor for receiving the electrical signal and generating a first ultrasonic frequency which has modulated thereon the at least one sonic frequency, a parametric demodulator for recovering the at least one sonic frequency from the first ultrasonic frequency, and a speaker for directly emitting the at least one sonic frequency.
REFERENCES:
patent: 1616639 (1927-02-01), Sprague
patent: 1951669 (1934-03-01), Ramsey
Bank Jeevan
Norris Elwood G.
American Technology Corporation
Chang Vivian
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