Raytheon Company

Bbn Technologies Corporation

Istvan L Ver

Paul James Remington

Alan Robert Douglas Curtis

William Bowles Coney

John C Heine

Robert David Preuss

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.

Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities

A system () for reducing non-acoustic noise includes a primary sensor (), at least one secondary sensor (), a filter (), and a summation unit (). The primary sensor () measures pressure and produces a primary pressure signal. The at least one secondary sensor () measures pressure and produce a secondary pressure signal. The filter () processes the secondary pressure signal to produce a filtered pressure signal. The summation unit () subtracts the filtered pressure signal from the primary pressure signal to reduce non-acoustic noise in the primary pressure signal.

Systems and methods for adaptive noise cancellation

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Stow, MA, United States of America

Istvan L Ver