Silencing apparatus operable to reduce vehicle noise at a teleph

Details Silencing apparatus operable to reduce vehicle noise at a teleph Silencing apparatus operable to reduce vehicle noise at a teleph

1995-07-13

1997-01-14

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 86, A61F 1106

Patent

active

055948030

ABSTRACT:
A silencing apparatus for effectively reducing noises in the three dimension space which detects physical characteristics of the noise source by the laser doppler sensor unit during the noise source comes close to the telephone booth, and collects acoustic characteristics of the noise source by the sensor microphone array. The control portion generates an inverse-phased signal against the noise source so that the noises are decreased at the error sensor, and stores the noise source information ( physical characteristics and the acoustic characteristics) and the generated inverse-phased signal. When the same noise source come closely, the voice is generated from the speaker using the inverse-phased signal stored in the memory. The control portion generates an inverse-phased voice from the speaker when the collected noise by the sensor microphone is actually over a certain threshold level.

REFERENCES:
patent: 4566118 (1986-01-01), Chaplin et al.
patent: 4878188 (1989-10-01), Ziegler, Jr.
patent: 5251262 (1993-10-01), Suzuki et al.

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