Simple FIR Digital Filters The 3-dB cutoff frequency @c can be considered as the passband edge frequency As a result, for the filter Ho(z)the passband width is approximately T /2 The stopband is from /2 to T Note:H0(二-) has a zero at z=-10ro=元, 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