Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1995-09-11
1998-03-17
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 93, H04R 2700
Patent
active
057296146
ABSTRACT:
In an apparatus for amplifying a sound while suppressing a howling noise, a microphone collects a sound and converts the collected sound into a corresponding input signal. An amplifier amplifies the input signal to generate the sound through a loudspeaker. A plurality of equalizers are interposed between the microphone and the amplifier, each equalizer having a variable attenuation frequency for attenuatively filtering the input signal around the attenuation frequency. Detection is conducted for detecting a plurality of noise spectrum peaks of the howling noise contained in the collected sound. Then, an adjustment is conducted adjusting respective variable attenuation frequencies of the plurality of the equalizers correspondingly to the plurality of the detected noise spectrum peaks to thereby remove the howling noise from the generated sound.
REFERENCES:
patent: 4064462 (1977-12-01), Goehler et al.
patent: 4088835 (1978-05-01), Thurmond et al.
patent: 4602337 (1986-07-01), Cox
patent: 4845757 (1989-07-01), Wagner
Kimura Shigenobu
Kitano Mikio
Kuroiwa Kiyoto
Nagata Yuichi
Suzuki Satoshi
Isen Forester W.
Yamaha Corporation
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