Silencer for attenuating a sound or noise transmitted through an

Details Silencer for attenuating a sound or noise transmitted through an Silencer for attenuating a sound or noise transmitted through an

1997-09-04

2000-06-20

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

381 711, A61F 1106, H03B 2900

Patent

active

06078671&

ABSTRACT:
A silencer is adapted to be mounted on an air duct. The silencer includes a noise detecting microphone for detecting a noise transmitted through the air passage of the duct, a loud speaker for delivering on the basis of the noise detected by the microphone into the air passage a sound which is substantially the same as the noise except that the phase of the sound is the reverse of that of the noise to thereby enable the sound to be superimposed on the noise and attenuate the noise, and vibration shield provided between the microphone and the wall of said duct for shielding any vibrations transmitted through the wall to the microphone. The vibration shield includes a duct element made from a sound absorbing material which element forms a part of the duct and the noise detecting microphone is mounted to the duct element. Alternatively, the vibration shield can include a vibration shield member mounted on the outside of the duct where an opening is provided in the wall of the duct and a noise detecting microphone is provided with a windscreen around a sound collecting portion of the microphone. The windscreen is inserted into a through hole provided in the shield member to fasten the microphone.

REFERENCES:
patent: 4191096 (1980-03-01), Ramsey
patent: 4514598 (1985-04-01), Plice
patent: 4991220 (1991-02-01), Wolf
patent: 5031872 (1991-07-01), Vance
patent: 5606622 (1997-02-01), Christenson

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