Active noise attenuating device

Details Active noise attenuating device Active noise attenuating device

1993-12-28

1996-07-09

Coles, Sr, Edward L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, G10K 1116

Patent

active

055352839

ABSTRACT:
An active noise attenuating device applied to a draft duct of an air condition system including a microphone disposed in a propagation path of noise for detecting the noise, a loud speaker disposed in the noise propagation path, a control circuit for producing a control signal on the basis of the detection signal from the microphone, the control signal being supplied to the loud speaker so that the speaker produces an interference sound having the same amplitude as of the noise detected by the microphone and a phase opposite to the noise, at a control point in the noise propagation path, and a high pass filter for damping or cutting off a frequency component contained in the control signal and belonging to a low frequency range in which the loud speaker is unable to reproduce the interference sound.

REFERENCES:
patent: 4837834 (1989-06-01), Allie
patent: 5127235 (1992-07-01), Nakanishi et al.
patent: 5251262 (1993-10-01), Suzuki
patent: 5253486 (1993-10-01), Sugahara
patent: 5278780 (1994-01-01), Eguchi
patent: 5337366 (1994-08-01), Eguchi

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