Noise reduction apparatus

Details Noise reduction apparatus Noise reduction apparatus

1995-01-05

1995-10-03

Ramirez, Ellis B.

Boots, shoes, and leggings

364508, 381 71, 381 731, 381 94, H03F 126, H04R 302

Patent

active

054557798

ABSTRACT:
When noise is caused by the mechanical vibration propagated from the engine, the microprocessor calculates from the vibration frequency of the engine the secondary sound signal which is in antiphase with the noise and which is thus able to cancel out the noise, and supplies it to the loudspeaker which then emanates the secondary sound according to this signal. At this time,the divergence detection circuit monitors the incoming secondary sound signal, and when the secondary sound signal is remarkably increased, it decides that the noise is increased, and automatically stops the secondary sound output from the loudspeaker. Therefore, it can be prevented that the noise is reversely increased by the secondary sound.

REFERENCES:
patent: 5010576 (1991-04-01), Hill
patent: 5029218 (1991-07-01), Nagayasu
patent: 5105377 (1992-04-01), Ziegler, Jr.
patent: 5111507 (1992-05-01), Nakaji
patent: 5119902 (1992-06-01), Geddes
patent: 5140640 (1992-08-01), Graupe et al.
McCosh, Dan, "Anti-Noise Noises", Popular Science, V233, p. 17(2), Jul. 1988.
Denenberg, Jeffrey, "Anti-Noise: Quieting the Environment with Active Noise Cancellation Technology", IEEE Potentials, Apr. 1992, vol. 11, No. 2, pp. 36-40.

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