Biomedical Engineering Reference
In-Depth Information
1.2
2000
1
1500
0.8
1000
0.6
500
0.4
0
0.2
−
500
0
−
0.01
−
0.005
0
0.005
0.01
0
500
1000
1500
2000
Frequency (Hz)
(a)
Delay (msec)
(b)
1.2
2000
1
1500
0.8
1000
0.6
500
0.4
0
0.2
−
500
0
−
0.005
0.01
0.005
0
Delay (msec)
−
0.01
0
Delay (msec)
0.005
−
0.01
−
0.005
0.01
(d)
(c)
1
0.8
0.6
0.4
0.2
0
0
1500
2000
500
1000
Frequency (Hz)
(e)
FIGURE 11.21
Filter design by windowing. (a) Truncated ideal low-pass filter impulse response. (b) Magni-
tude response for the ideal truncated filter. Note the errors in the passband and stopband regions. (c) Window
function. (d) Windowed impulse response. (e) Magnitude response of the windowed filter exhibits substantially
smaller passband and stopband errors.
