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    时间: 2019-12-25 15:02
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    Foreverytimedomainwaveformthereisacorrespondingfrequencydomainwaveform,andviceversa.Forexample,arectangularpulseinthetimedomaincoincideswithasincfunction[i.e.,sin(x)/x]inthefrequencydomain.Dualityprovidesthatthereverseisalsotrue;arectangularpulseinthefrequencydomainmatchesasincfunctioninthetimedomain.WaveformsthatcorrespondtoeachotherinthismannerarecalledFouriertransformpairs.Severalcommonpairsarepresentedinthischapter.CHAPTERFourierTransformPairs11Foreverytimedomainwaveformthereisacorrespondingfrequencydomainwaveform,andviceversa.Forexample,arectangularpulseinthetimedomaincoincideswithasincfunction[i.e.,sin(x)/x]inthefrequencydomain.Dualityprovidesthatthereverseisalsotrue;arectangularpulseinthefrequencydomainmatchesasincfunctioninthetimedomain.WaveformsthatcorrespondtoeachotherinthismannerarecalledFouriertransformpairs.Severalcommonpairsarepresentedinthischapter.DeltaFunctionPairsFordiscretesignals,thedeltafunctionisasimplewaveform,andhasanequallysimpleFouriertransformpair.Figure11-1ashowsadeltafunctionin……