摘要
Onenearfieldacousticholography(NAH)techniqueisproposedforanalyzingcyclostationarysoundfield.Thesignalofthiskindofsoundfieldhasveryseriousmodulationphenomenongenerally,inspectrumofwhichobvioussidebandsexist.ItisdifficultforthetraditionalNAHtopossessdemodulationfunction,sovirtualpowerofsidebandsexistsinitshologram.ReplacingtheFourier'stransformwiththesecond-ordercyclicstatistics,theproposedNAHtechniqueusesthecyclicspectrumdensity(CSD)functionasreconstructedphysicalquantity,insteadofthespectrumorpowerspectrumdensityofsoundpressuresignal.TheCSDfunctioncandemodulatecyclostationarysignals,whichmakesnovirtualpowerofsidebandsinitshologram.TheresultsofsimulationandexperimentshowthattheproposedNAHcanextractmoreinformationaboutcyclostationarysoundfieldthantraditionalNAH,bywhichsoundfieldcanbeknownmoreclearly.
出版日期
2005年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
