1 1 2 2 1 2 Solution x n x n x n x n x n x n y n x n x n y n Let To show time

1 1 2 2 1 2 solution x n x n x n x n x n x n y n x n

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: ( ) ( ) ( ) ( 1) ( ) ( 1) ( ) 2 2 ( ) ( 1) ( ) 2 Solution x n x n x n x n x n x n y n x n x n y n Let
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To show time Invariance, let 0 0 0 0 0 0 ( ) ( 1) ( ) ( ) ( ) 2 ( ) ( 1 ) 2 ( ) ( 1 ) ( ) 2 Compared with x n x n x n x n n y n x n n x n n x n n x n n y n n     The system is TI Example: ( ) cos( ), y n n Is the system TI?
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