已知f(t)的波形如下图所示,则f(t)的表达式为[img=183x135]17869c17a5df3e3.bmp[/img]
A: f(t)=(t+1)ε(t)-(t+1)ε(t+1)
B: f(t)=tε(t)-(t-1)ε(t-1)
C: f(t)=tε(t)-tε(t-1)
D: f(t)=(1-t)ε(t)-(1-t)ε(t-1)
A: f(t)=(t+1)ε(t)-(t+1)ε(t+1)
B: f(t)=tε(t)-(t-1)ε(t-1)
C: f(t)=tε(t)-tε(t-1)
D: f(t)=(1-t)ε(t)-(1-t)ε(t-1)
举一反三
- 已知f(t)的波形如下图所示,则f(t)的表达式为 A: f(t)=tε(t)-tε(t-1) B: f(t)=tε(t)-(t-1)ε(t-1) C: f(t)=(1-t)ε(t)-(1-t)ε(t-1) D: f(t)=(t+1)ε(t)-(t+1)ε(t+1)
- 已知信号f(t)的波形如图所示,则f(t)的表达式为() A: (t+1)ε(t) B: δ(t-1)+(t-1)ε(t) C: (t-1)ε(t) D: δ(t+1)+(t+1)ε(t)
- 已知信号f(t)的波形如下图所示,则f(t)的表达式为( )[img=337x218]1803c214dd3ccce.png[/img] A: δ(t-1)+(t+1)u(t) B: δ(t+1)+tu(t) C: δ(t+1) +(t-1)u (t) D: δ(t+1)+(t+1)u(t)
- 若f(t)*h(t)=y(t),则f(t-1)*h(t+1)= 。
- 已知信号f(t)的波形如图所示,则f(t)的表达式为() A: tε(t) B: (t-1)ε(t-1) C: tε(t-1) D: 2(t-1)ε(t-1)