Abstract
An active acoustic attenuation system and method which operates in a waveguide (i.e. duct or beam) to attenuate acoustic waves having energy in the plane wave node and in higher order nodes. The invention does this by sensing the acoustic wave at linearly independent locations across a waveguide, decoupling the signals to generate an independent signal for each node being attenuated, processing the signal for each node independently of one another, and combining the processed signals for each node to drive a set of actuators at linearly independent locations across a waveguide. The invention is useful for both sound control and vibration control.
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