4.18 求下列信号的傅里叶变换。-|||-(1) (t)=(e)^-tg(t-2)-|||-(2) (t)=(e)^-3(t-1)g'(t-1)-|||-(3) (t)=gsin ((t)^2-9)-|||-(4) (t)=(e)^-2tg(t+1)-|||-(5) (t)=g(dfrac (1)(2)t-1)

2.17 求下列函数的卷积积分 _(1)(t)*(f)_(2)(t)-|||-(1) _(1)(t)=tg(t) _(2)(t)=g(t)-|||-(2) _(

2.17 求 下列函数的卷积积分 _(1)(t)*(f)_(2)(t) o-|||-(1) _(1)(t)=tg(t) _(2)(t)=g(t)-|||-(2)

2.17 求下列函数的卷积积分 _(1)(t)*(f)_(2)(t) o-|||-(1) _(1)(t)=tg(t) ,_(2)(t)=e(t)-|||-(2)

1-12 绘出下列各时间函数的波形图,注意它们的区别。-|||-(1) [ u(t)-u(t-1)] -|||-(2) cdot u(t-1)-|||-(3)

1-12 绘出下列各时间函数的波形图,注意它们的区别。-|||-(1) [ u(t)-u(t-1)] -|||-(2) cdot u(t-1)-|||-(3)

计算(t)=3+2(e)^-it的傅里叶变换( )(t)=3+2(e)^-it(t)=3+2(e)^-it(t)=3+2(e)^-it计算的傅里叶变换()

[判断题]式子f(t)*δ(t-1)=f(1)δ(t-1)是正确的。( )A.对B.错

[判断题]式子f(t)*δ(t-1)=f(1)δ(t-1)是正确的。( )A.对B.错

[判断题]式子f(t)*δ(t-1)=f(1)δ(t-1)是正确的。( )A.对B.错

[判断题]式子f(t)*δ(t-1)=f(1)δ(t-1)是正确的。( )A.对B.错