3AM调制系统性能 乡AM信号的解调器几乎都采用包络检波器 s (t)=LA+m(t)]cost A≥m maX n(t=n(t)cosa t-n (t)sin a t A2,m2(t) 2 2 N=n (t=nB 1010 3.AM调制系统性能 AM信号的解调器几乎都采用包络检波器 s t A m t t m  c ( ) =[ + ( )]cos max A  m(t) n t n t t n t t i c  c s  c ( ) = ( )cos − ( )sin 2 ( ) 2 2 2 A m t Si = + Ni ni t n0B 2 = ( ) =