Basic Research on Active Acoustic Shielding

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Active Acoustic Shielding (AAS) is a system that can attenuate the sound passing through an open window. The AAS system is constructed from many AAS cells set in an array each with an approximately collocated microphone and speaker. In this research, the feasibility of the basic concept of AAS was proved by some simple simulations and experiments. A small open window with four AAS cells was fabricated and its noise reducing performance was demonstrated for not only a normal incident noise source but an oblique incident source, multiple sources and moving sources.