Simple FIR Digital Filters The 3-dB cutoff frequency @c can be considered as the passband edge trequency As a result, for the filter Ho(z) the passband width ly兀/2 Is approximately The stopband is from T /2 to T Note Ho(z) has a zero at z=-I oro=T which is in the stopband of the filter Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 9 Simple FIR Digital Filters • The 3-dB cutoff frequency can be considered as the passband edge frequency • As a result, for the filter the passband width is approximately p/2 • The stopband is from p/2 to p • Note: has a zero at or w = p, which is in the stopband of the filter wc H (z) 0 H (z) 0 z = −1