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cheby2

Chebyshev Type II filter using specification object

Syntax

chebTwoFilter= design(d,'cheby2','SystemObject',true)
chebTwoFilter = design(d,'cheby2',designoption,value,designoption,
value,'SystemObject',true)

Description

chebTwoFilter= design(d,'cheby2','SystemObject',true) designs a Chebyshev II IIR digital filter using the specifications supplied in the object d.

chebTwoFilter = design(d,'cheby2',designoption,value,designoption,
value,'SystemObject',true)
returns a Chebyshev II IIR filter where you specify design options as input arguments.

To determine the available design options, use designopts with the specification object and the design method as input arguments as shown.

designopts(d,'method')

For complete help about using cheby2, refer to the command line help system. For example, to get specific information about using cheby2 with d, the specification object, enter the following at the MATLAB prompt.

help(d,'cheby2')

Examples

collapse all

Construct a default lowpass filter specification object and design a Chebyshev Type II filter.

d = fdesign.lowpass;

Use matchexactly option to ensure the performance of the filter in the passband.

LowpassCheb2 = design(d,'cheby2','matchexactly','passband',...
    'SystemObject',true);

Use fvtool to view the resulting filter

fvtool(LowpassCheb2)

Construct a highpass filter specification object and design a Chebyshev Type II filter. Specify the filter order, stopband edge frequency, and the stopband attenuation to get the filter exactly as required.

d = fdesign.highpass('n,fst,ast',5,20,55,50);
HighpassCheb2 = design(d,'cheby2','SystemObject',true);

Use fvtool to view the resulting filter

fvtool(HighpassCheb2)

By design, cheby2 returns filters that use second-order sections (SOS). For many applications, and for most fixed-point applications, SOS filters are particularly well-suited.

See Also

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Introduced in R2011a

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