An active vibration control system is considered for the reduction of sound transmission through a square plate acted on by a reverberant field. The study includes the prediction of the resonant frequencies of the plate involved, the derivations of both the feedback adaptive control algorithm and the volume velocity cancellation technique adopted, and the experiment for active vibration control on the sound transmission through a plate. It is demonstrated that an improvement of the order of 6 decibels at 132 Hz is obtained. Also, increased transmission loss at lower resonant frequencies is possible.
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