This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.


Chebyshev Type I filter using specification object


chebOneFilter = design(d,'cheby1','SystemObject',true)
chebOneFilter = design(d,'cheby1',designoption,value,designoption,


chebOneFilter = design(d,'cheby1','SystemObject',true) designs a type I Chebyshev IIR digital filter using the specifications supplied in the object d. Depending on the filter specification object, cheby1 may or may not be a valid design. Use designmethods with the filter specification object to determine if a Chebyshev type I filter design is possible.

chebOneFilter = design(d,'cheby1',designoption,value,designoption,
returns a type I Chebyshev 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.


For complete help about using cheby1, refer to the command line help system. For example, to get specific information about using cheby1 with d, the specification object, enter the following at the MATLAB prompt.



collapse all

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

d = fdesign.lowpass; designopts(d,'cheby1');

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

LowpassCheb1 = design(d,'cheby1','matchexactly','passband',...

Use fvtool to view the resulting filter


Construct a highpass filter specification object and design a Chebyshev Type I filter. Specify the filter order, passband edge frequency, and the passband ripple to get the filter exactly as required.

d = fdesign.highpass('n,fp,ap',7,20,.4,50);
HighpassCheb1 = design(d,'cheby1','SystemObject',true);

Use fvtool to view the resulting filter


By design, cheby1 returns filters that use second-order sections (SOS). For many applications, and for most fixed-point applications, SOS filters are particularly well-suited.

Introduced in R2011a

Was this topic helpful?