2018年华南理工大学824信号与系统考研真题(A卷).pdf

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824A2018( ) ( )116 LTI nN1 0x n y n nN20 1 h n2 h n 316 ( )x t210001( )2Tkjk tkx t e ( )x t( ) 0, 100H j 5 ( )x t( )x t161( )x t2( )x t1 ( )Od x t2 ( )Od x t1 ( )Od x t2 ( )Od x t1Ev ( )x t2 ( )Ev x t(18 ) ( )x t ( )X s21. ( )X s2. ( )X s3. ( )X s Re 16s4.00,( )8 ,tkkxce k0c t5.18(1.125) 3ex( ) ?x t16 LTI 1hn ?1161,| | 2( )0,| | 2tx tt203,4 4c( )y t( )h t2318 ( )x t ( )X j ( ) 0,| |2X j( ) (3 ) ( ), 1kf t x t t kT T ( )f t1 ( )r t3( ) ( )cos2y t r t t( )Y j 0 ( )Y j3218 f n f n D3sin14 x nn y n316 LTI x n y n1 1 1 2 6 6y n y n y n x n ( )jH e h n1 ( ) 2nx n u n y n

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