Simultaneous enhancement of transmission loss and absorption...

Details Simultaneous enhancement of transmission loss and absorption... Simultaneous enhancement of transmission loss and absorption...

2011-06-28

2011-06-28

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Particular transducer or enclosure structure

C381S191000, C181S206000

Reexamination Certificate

active

07970148

ABSTRACT:
A method and apparatus for providing simultaneous enhancement of transmission loss and absorption coefficient using activated cavities is presented. A layer of material is provided, and a backing plate having a plurality of cavities on the top surface of said backing plate, is disposed adjacent a top surface of said layer of material. A screen is disposed along the top surface of said cavities on said backing plate and at least one cavity includes an actuator disposed within the cavity and a control system receiving a signal from the microphone and receiving a signal from the accelerometer and providing a drive signal to the actuator to provide an acoustic output to provide simultaneous insertion loss and absorption which serves to minimize a linear combination of the signal from the microphone and the signal from the accelerometer.

REFERENCES:
patent: 5170433 (1992-12-01), Elliott et al.
patent: 5979593 (1999-11-01), Rice et al.
patent: 6829131 (2004-12-01), Loeb et al.
patent: 2002/0122561 (2002-09-01), Pelrine et al.
patent: 2002/0126852 (2002-09-01), Kashani
patent: 2003/0048911 (2003-03-01), Furst et al.

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