简介：Inthispaper,theenergyformulasofActiveSoundAbsorption(ASA)inspacesoundfieldhavebeenderivedfromthebasicsoundwaveequation,andASAincludingtherelevantconditionsofmultipolesecon-dary-source,suchasmonopole,dipoleandtripole,etc.,hasbeendis-cussed.Onthebasisofthediscussion,ithaspointedoutthatdipolesec-ondary-configuration(DAA)isthesimplestattenuator.TheresultsoftheexperimentsdoneinanechoicchamberhaveshownthatDAAhaseffectiveperformanceswhichjustprovidethefundationandfeasibilityofpracticaluse.
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