112()()()jasakkkX eXjjkXjTTT1()()jdaskXeXjjkTTDT22ssTDTD T 12()akkXjDTDT1()sakXjjkDTD/2s/2sss02 f2202/sff/2sf/2sfsfsf0f0.50.5110/sfff( )()kp nnkD( )( )( )pxnx np n2()01()()()2jjjpXeP eX ed 1()01()sDjkkX eD()()jjDdpXeXe时域序列乘脉冲串I( )pxn( )Ix n( )x n( )h nI( )x n( )IdxnD( )h nI( )Ix n( )x n( )IdxnDsfIsfIf/IdsfIfD( )pxn插值抽取1( )h n2( )h n
