| A STUDY OF SPATIAL ACTIVE NOISE ATTENUATIONS |
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| 作者姓名： | 田静 沙家正 |
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| 作者单位： | Institute of Acoustics，Nanjing University，Institute of Acoustics，Nanjing University |
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| 摘 要： | In this paper.the sound radiation characteristics of secondary sources are analyed theoretically and experimentally.Akind of tripole elements of secondary source is realied.A method using acceleration signal as the input to the controlsystem has been introduced.Experiments are conducted both in an anechoic chamber and a reverberation room.The resultsof global attenuations of the-dimensional noise fields in tbe low frequency range are given and discussed.
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