时域信号分析小结与复习(1) 2000/10/12 基本概念 典型基本信号: f()=A(-∞<t<+∞) ●f(t)=Acos(Ot+q)(-∞<t<∞) f(t=Ae <t< (t>0) f()=(0)=105(a < (t=0) 6(t)dt=1 单位冲激信号的性质: f(t)6(t)=f(o)6(t) 2.f(1)(t-t)=f(t)o(t-t) f(to(dt=f(o) 4.f(0)6(t-10)t=f() 6.d(1) d() d(rdr=u(t) 7.o1(1)=∑6(t-n7)时域信号分析小结与复习（1） 2000/10/12 基本概念 一、典型基本信号： ⚫ f (t) = A (−  t  +) ⚫ f (t) = Acos( t + ) (−  t  ) ⚫ ( ) = (−   ) + f t Ae t jt  ⚫       =  = = 0 ( 0) 0.5 ( 0) 1 ( 0) ( ) ( ) t t t f t u t ⚫      =      = = =   − ( ) 1 0 ( 0) ( 0) ( ) ( ) t dt t t t f t   单位冲激信号的性质： 1. f (t) (t) = f (o) (t) 2. ( ) ( ) ( ) ( ) 0 0 0 f t  t −t = f t  t −t 3.   − f (t) (t)dt = f (0) 4.   − ( ) ( − ) = ( ) 0 0 f t  t t dt f t 5.  (t) =  (−t) 6. dt du t t ( )  ( ) = − = t  ( )d u(t) 7.   =− = − n  T (t)  (t nT)