PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

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