Active attenuation of noise—The monopole system
- 1 March 1982
- journal article
- research article
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 71 (3) , 608-611
- https://doi.org/10.1121/1.387532
Abstract
Towards solving the noise pollution problem of the human environment, proposals were made to attenuate noise propagating down a duct by adding an antiphase copy of the primary noise. In a number of configurations, 2 or 3 sources were used to produce the secondary noise, but a successful system with 1 source was not realized. The conventional monopole system is analyzed, and the reason why this type of mnonopole secondary source is not a practical solution is investigated. A modified system with a new solution of the problem is developed.Keywords
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