The principle of an active scatterer based on the JMC method

Seppo Uosukainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    The principle of formulating the JMC method to produce secondary sources that function as active scatterers on a hypothetical scattering surface is established. The principle can be applied, e.g., in the active control of interior spaces where changeable acoustical properties or adding sound quality and comfort are needed. The examination is based on the modified JMC method, to ensure that the logic does not lead to the need of changing the primary sources. The actively reflecting plane serves as an example of the JMC formulation for the active scatterer. The solution for the actively reflecting plane works on the local control principle: each reflecting subarea needs information of the primary field only at that subarea. The solution can also apply to piecemeal planar surfaces and to smooth convex surfaces, approximately. More versatile active scatterers, the boundary condition elements and the scattering–absorbing elements, do not generally work on the local control principle. With those elements any homogeneous boundary condition can be realized and original boundary conditions can be changed to any desired ones.
    Original languageEnglish
    Title of host publicationInter-Noise and Noise-CON Congress and Conference Proceedings, InterNoise04
    Pages1627-1633
    Publication statusPublished - 2004
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event33rd International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2004 - Prague, Czech Republic
    Duration: 22 Aug 200425 Aug 2004
    Conference number: 33

    Publication series

    SeriesNOISE-CON Proceedings
    Volume2004
    ISSN0736-2935

    Conference

    Conference33rd International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2004
    Abbreviated titleINTER-NOISE
    CountryCzech Republic
    CityPrague
    Period22/08/0425/08/04

    Keywords

    • active sound control
    • JMC method
    • sound scatterer

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