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Unformatted text preview: - 88-89-1 : 1388/8/20 : ( M = L ( . -1 . M L L M M L downsample 3 -2 x[n] = [n n0] ( 3n n ( cos 4 4 n n x[n] [sin ] /( ) ( 4 4 n n x[ n] ( 1) n [sin ] /( ) ( 3 3 x[n] cos ( ) . C/D -3 aliasing T T . x[n] sin n xc (t ) sin 9t ( 4 n sin 2 x (t ) sin 9t ( . x[n] c n 9t 2 B xc(t) -4 x2 . 3dB SQNR 10 log 2 e Discrete-Time Signal Processing, 4.8.3 . Oppenheim, 2nd ed. xr[n] xe[n] xd[n] -5 x[n] = xr[n] x[n] 4 xd[n] 4 xe[n] H(ej) 4 4 xr[n] 1 H ( e j ) 0 | | | | n ( 5 n ( x[ n] cos 3 n n x[n] [sin ] /( ) ( 8 8 x[ n] cos...
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