如果f()1()(t)是左右两个矩形脉冲信号,f()2()(t)是左右两个单位冲激信号,则求f()1()(t)*()f()2()(t)的正确方法有A.()将f()1()(t)左右两个矩形脉冲信号与f()2()(t)左右两个单位冲激信号分别对应卷积后再相加()B.()将f()1()(t)左右两个矩形脉冲信号分别与f()2()(t)卷积后再相加()C.()将f()1()(t)分别与f()2()(t)左右两个单位冲激信号分别对应卷积后再相加()D.()将f()1()(t)左右两个矩形脉冲信号与f()2()(t)右左两个单位冲激信号分别对应卷积后再相加
举一反三
- 如果()f()1()(t)()和()f()2()(t)()均为()周期信号(),()下列()对()信号()f()1()(t)()+()f()2()(t)()说法正确的是()。A.()一定是周期信号()B.()一定是()非()周期信号()C.()f()1()(t)()+()f()2()(t)()是否为周期信号,与()f()1()(t)()及()f()2()(t)()周期无关。()D.()若()f()1()(t)()和()f()2()(t)()周期()均为整数,则一定是()周期信号
- 已知信号h(t)=ε(t一1)一ε(t一2),f(t)=ε(t一2)一ε(t一4),则卷积h(t)*f(t)=_____________。
- f(t)为原始信号,f1(t)为变换信号,则f1(t)的表达式是( )。[img=722x219]17de73b5129ea9f.png[/img] A: f(t/2 + 1) B: f(-t/2 - 1) C: f(-2t+1) D: f(-t/2 + 1)
- f(t)为原始信号,f1(t)为变换信号,则f1(t)的表达式是( )。[img=722x219]1803709447eacc9.png[/img] A: f(t/2 + 1) B: f(-t/2 - 1) C: f(-2t+1) D: f(-t/2 + 1)
- 【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)