Ff(小=-2x∑F26(0-n) 2兀 (o)=F7()=0∑6(0-mO) c120 6()的频谱密度函数仍然是冲激序列,强度和间隔都是a1[ ( )] 2 ( ) π F δ ω nω1 FT f t n = ∑ n − ∞ =−∞ ( ) [ ( )] ( ) 1 2 1 1 1 1 1 ∑ ∞ =−∞ = = ∴ = = − n n F FT T t n T T F ω δ ω δ ω ω π Q ω δ T (t)的频谱密度函数仍然是冲激序列，强度和间隔都是ω1