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消息过滤器,模拟人耳的频率响应,是一种常用指定的测试和测量滤波器在美国在欧洲的语音,音频和电子通讯应用,近亲是杂音计噪声加权滤波器。通过级联一个二阶低通部分的三个二阶带通部分,你可以建造两种类型。C信息滤波器。Maxim>AppNotes>FILTERCIRCUITS(ANALOG)TEMPERATURESENSORSandTHERMALMANAGEMENTKeywords:ProgrammableUniversalFilterImplementsC-MessageWeightingFunctionJul09,1998APPLICATIONNOTE11ProgrammableUniversalFilterImplementsC-MessageWeightingFunctionTheC-messagefilter,whichsimulatesthefrequencyresponseofthehumanear,isacommonlyspecifiedtestandmeasurementfilterforvoice,audio,andtelecomunicationapplicationsintheU.S.InEurope,acloserelativeisapsophometricnoise-weightingfilter.Youcanconstructeithertypebycascadingthree2nd-orderbandpasssectionswitha2nd-orderlowpasssection.TheC-messagefilter,forexample,isshowninFigure1Figure1.Cascaded,2nd-orderuniversalfiltersectionsimplemen……