• 2022-06-29
    已知f1(t)和f2(t)波形如下,若f(t)=f1(t)*f2(t),则f(0)=
    A: 1
    B: 2
    C: 3
    D: 4
  • B

    内容

    • 0

      【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)

    • 1

      若f(t)=f1(t)*f2(t),则有f(t)=f1(2t)*f2(2t)。

    • 2

      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)

    • 3

      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)

    • 4

      信号f1(t)和f2(t)如下图所示,f(t)=f1(t)*f2(t),则f(-1)等于[img=647x315]17869c198f03a3c.bmp[/img] A: -1 B: -0.5 C: 1 D: 1.5