Simultaneous enhancement of transmission loss and absorption coefficient using activated cavities

A method of providing noise control comprising:

• receiving a signal from a microphone disposed within a cavity;
• receiving a signal from an accelerometer disposed within said cavity;
• providing a drive signal to an actuator to provide an acoustic output to provide simultaneous insertion loss and absorption which serves to minimize a linear combination of said signal from said microphone and said signal from said accelerometer;
• providing a first shell disposed within said cavity and wherein a first driver is disposed on said first shell;
• providing a second shell abutting said first shell such that said first shell and said second shell enclose a volume of air at a reduced pressure therein;
• and
• wherein said 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 said microphone and the signal from said accelerometer is provided by providing said drive signal to said first driver.