632 Practical MATLAB® Applications for Engineers
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*****FILTERS TRANSFER FUNCTIONS **********
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Chebyshev type 1
Transfer function:
0.8006 z^3 - 2.402 z^2 + 2.402 z - 0.8006
-----------------------------------------
z^3 - 2.577 z^2 + 2.207 z - 0.6217
Sampling time: 0.3
^^^^^^^^^^^^^^^^^^^
Chebyshev type 2
Transfer function:
0.9564 z^3 - 2.853 z^2 + 2.853 z - 0.9564
-----------------------------------------
z^3 - 2.894 z^2 + 2.81 z - 0.9147
Sampling time: 0.3
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FIGURE 6.59
Magnitude and phase plots of Chebyshev type-1 and -2 digital HPFs of Example 6.9.
1
Mag. of Cheby. type/1, HPF
0.8
0.6
W in rad
Magnitude0.4
0.2
0
012345
Phase of Cheby. type/1, HPF
600
400
200
0
Angle in degrees
0510
W in rad
200
400
10 5
Phase of Cheby. type/2, HPF
600
400
200
0
200
400
10 50510
Angle in degrees
W in rad
Mag. of Cheby. type/2, HPF
1.5
1
0.5
0
0 0.5 1
W in rad
Magnitude