任蕾
摘要:卷積是信號與系統(tǒng)課程中的一個重要知識點,是溝通系統(tǒng)時域分析與變換域分析方法的橋梁。直流信號作為一類特殊信號,與能量信號進(jìn)行卷積運算時,一般可結(jié)合卷積定義或卷積的各類性質(zhì)實現(xiàn)。這一類卷積計算的本質(zhì)可理解為直流激勵通過線性時不變系統(tǒng),或者信號通過全積分系統(tǒng),其卷積結(jié)果為系統(tǒng)的零狀態(tài)響應(yīng)。通過幾個例子介紹了該類卷積計算的本質(zhì)和計算過程中需注意的問題。
關(guān)鍵詞:卷積;信號與系統(tǒng);直流激勵;能量信號
中圖分類號:TN911 文獻(xiàn)標(biāo)識碼:A 文章編號:1009-3044(2015)33-0152-02
The Nature of Convolution Between Direct Current Signal and Energy Signals
REN Lei
(College of Information Engineering, Shanghai Maritime University, Shanghai 201306, China)
Abstract: Convolution is one important knowledge point of signal and system, which is the bridge between time-domain analysis method and transform-domain analysis method for system. Generally, convolution of direct current signal and other signals can be conducted using the definition and properties of convolution. The nature of such convolution is considered as the process that direct current signal as excitation signal through a linear time-invariant system or through all integration system. The result of convolution is the zero-state response of system. Several examples are provided to show the nature of convolution and the notes about it are also pointed out.
Key words: convolution; signal and system; direct current excitation of system; energy signal
3 結(jié)束語
卷積不僅是一種積分運算,在線性時不變系統(tǒng)分析中,卷積運算有重要作用。系統(tǒng)的零狀態(tài)響應(yīng)可由激勵信號與系統(tǒng)沖激響應(yīng)卷積求得,因此,深刻理解其含義和本質(zhì)有助于本知識點的學(xué)習(xí)。本文著重討論了直流信號與能量信號卷積的本質(zhì)和計算,通過例題說明了其卷積計算的過程和本質(zhì)。
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