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US5834647A Active device for attenuating the sound intensity 失效
用于衰减声音强度的有源设备

Active device for attenuating the sound intensity
摘要:
A device for attenuating noises generated by moving sources includes a set of arranged electroacoustic sources which emit an opposite antinoise wave in response to an incident wave as sensed and processed. The electroacoustic sources are arranged to preferably emit a synchronous antinoise wave having a radius of curvature approximating that of the incident wave.
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