Active noise control for semi-closed cavity excited by diffuse acoustic field

Abstract

Application of active noise control (ANC) was discussed as method to prevent the occurrence of an inner acoustic mode inside the semi-closed cover placed in the diffuse acoustic field. The effect was validated by the experimental measurement using a reverberant room. The results show that the acoustic mode formed by semi-closed cavity has locally-coherency at its occurrence frequency and the inside cover acoustic mode can be controlled by applying ANC. It has been confirmed that noise reduction of ANC for the peak level caused by the acoustic mode is approximately 5dB.