Frequency-Selective Filters Ideal bandpass filter(discrete-time system) ww<w H 0. others H -9 Frequency-Selective Filters ◆Ideal bandpass filter(discrete-time system) ( )     = others w w w H e j w c c bp 0, 1, 1 2 0 1 wc 1 − − wc  ( ) jw H e 1 2 wc 2 − wc