Image Processing Reference
In-Depth Information
The amplitude answer of this filter is calculated as follows:
12cos
cos2
j en
(2
en
2 )
H
()
12cos
cos2
j en
(2
en
2)
2
sen
(3)
cos
1
2
cos
1
2
sen
2
For a sample frequency of 430 Hz, possible α values and associated cut frequency (-3 dB.)
are shown in Table 2. Figures 11, 12, and 13 show associated amplitude response for these
filters.
α Value
Cut Frequency
3
48 Hz
4
35 Hz
12
11.46 Hz
Table 2. Cut Frequencies of Low-Pass Lynn Filter
Fig. 11. Amplitude Response of Low-Pass Lynn's Filter for α=3
Fig. 12. Amplitude Response of Low-Pass Lynn's Filter for α=4
