對(duì)下列函數(shù)進(jìn)行積分運(yùn)算:,并畫出積分后的波形圖。 (1)f1(t)=u(t-1)-u(t-3) (2)f2(t)=δ(t-1) (3)f3(t)=sinπtu(t)
已知f(t)的波形如圖題所示,求f'(t)和f''(t),并分別畫出和的波形圖。
F'(t)=e-1δ(t)-e-1u(t) =δ(t)-e-1u(t)