632
Practical MATLAB
® Applications for Engineers
********************************************
*****FILTERS TRANSFER FUNCTIONS **********
********************************************
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
****************************************************
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
0.4
Magnitude
0.2
0
0
1
2
3
4
5
Phase of Cheby. type/1, HPF
600
400
200
0
Angle in degrees
0
5
1 0
W in rad
Ϫ200
Ϫ400
Ϫ10
Ϫ5
Phase of Cheby. type/2, HPF
600
400
200
0
Ϫ200
Ϫ400
Ϫ10
Ϫ5
0
5
1 0
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
CRC_47760_CH006.indd 632
CRC_47760_CH006.indd 632
7/23/2008 2:26:54 PM
7/23/2008 2:26:54 PM