Active sound attenuation device to be arranged inside a...

Details Active sound attenuation device to be arranged inside a... Active sound attenuation device to be arranged inside a...

2007-07-24

2007-07-24

Lee, Ping (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

C381S071700

Reexamination Certificate

active

10286901

ABSTRACT:
The device for the active sound attenuation of a sound signal propagated in a duct comprises: at least first sensor means for a first sound signal, attenuation actuating means supplying an active sound attenuation signal in response to a selected control signal, an electronic control means generating the active sound attenuation signal for the actuating means. The first sensor means and the actuating means are arranged completely inside the duct opposite one another and at a selected distance from the casing of the duct, the axis of symmetry of the radiation of the actuating means and the axis of symmetry of the first sensor means are substantially parallel to the direction of propagation of the sound signal in the duct, and the actuating means are arranged upstream of the first sensor means in the direction of propagation of the sound signal in the duct.

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