Active noise control

Details Active noise control Active noise control

G - Physics

10

K

179/5

G10K 11/16 (2006.01) A61F 11/14 (2006.01) G10K 11/36 (2006.01) H03B 29/00 (2006.01)

Patent

CA 1298793

-8- ABSTRACT OF THE DISCLOSURE Active Noise control An active noise control system for reducing the amount of noise propagated along a duct comprises a microphone mounted in the wall of the duct for detecting the noise, and an active antiphase noise source, such as a loudspeaker, which is mounted substantially in the centre of the cross-section of the duct. A control circuit coupled between the microphone and the antiphase noise source includes an integrator having a specific transfer function, which improves the loop gain of the microphone/source loop at low frequencies, and secures stability by altering the phase.

566554

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