1aq() 解调器输出的有用信号m2()=2 t p(t)=k,l m(tdr].. m(t)=m(t) k S。=m(t) m2() 4丌 2()= 2aA.{()sin[(t)-o() 1 dn(t) 2A dt 7(t) 2m427 解调器输出的有用信号 dt d t m t ( ) 2 1 ( ) 0 = ( ) = ( ) ] − t f t k m d ( ) 2 ( ) 0 m t k m t f = ( ) 4 ( ) 2 2 2 2 0 0 m t k S m t f = = (1) { ( )sin[ ( ) ( )] 2 1 ( ) 0 V t t t dt d A n t = − dt dn t A s ( ) 2 1 = ( ) 2 1 n t A s = (2)