7-模拟信号与模拟系统(10)

电工

度频幅和谱相位谱都频连是

续形式2 对 矩称脉冲信号形 E (ft ) = 0 ≤ tt> (tf )

τ τ1 22F (jω) = ∫ f t )(e ∞+∞

jωt

dt

∫=2τ Ee jω dt t τ2

τ E e ωtj 2= j ω τ 0 τ /22=

2

E is ωn 2τ =E τ ωτ 2

ωsinωτ2

τ/2 t|F(j ω|)(

Ετ幅频谱度

4π

τ

π20τ

π24π ω

τ

τ