sigwin.chebwin class - Package: sigwin

Construct Dolph-Chebyshev window object

Description

sigwin.chebwin creates a handle to a Dolph–Chebyshev window object for use in spectral analysis and FIR filtering by the window method. Object methods enable workspace import and ASCII file export of the window values.

The Dolph-Chebyshev window is constructed in the frequency domain by taking samples of the window's Fourier transform:

where

determines the level of the sidelobe attenuation. The level of the sidelobe attenuation is equal to . For example, 100 dB of attenuation results from setting

The discrete-time Dolph-Chebyshev window is obtained by taking the inverse DFT of and scaling the result to have a peak value of 1.

Construction

H = sigwin.chebwin returns a Dolph-Chebyshev window object H of length 64 with relative sidelobe attenuation of 100 dB.

H = sigwin.chebwin(Length) returns a Dolph–Chebyshev window object H of length Length with relative sidelobe attenuation of 100 dB. Length requires a positive integer. Entering a positive noninteger value for Length rounds the length to the nearest integer. A window length of 1 results in a window with a single value equal to 1.

H = sigwin.chebwin(Length,SidelobeAtten) returns a Dolph-Chebyshev window object with relative sidelobe attenuation of atten_param dB.

Properties

Length	Dolph-Chebyshev window length.
SidelobeAtten	The attenuation parameter in dB. The attenuation parameter is a positive real number that determines the relative sidelobe attenuation of the window.

Methods

generate	Generates Dolph-Chebyshev window
info	Display information about Dolph–Chebyshev window object
winwrite	Save Dolph-Chebyshev window object values in ASCII file

Copy Semantics

Handle. To learn how copy semantics affect your use of the class, see Copying Objects in the MATLAB Programming Fundamentals documentation.

Examples

Default length N=64 Dolph–Chebyshev window with 100 dB relative sidelobe attenuation:

H=sigwin.chebwin;
wvtool(H); 

Generate length N=128 Chebyshev window with 120 dB attenuation, return values, and write ASCII file:

H=sigwin.chebwin(128,120);
% Return window with generate
win=generate(H);
% Write ASCII file in current directory
% with window values
winwrite(H,'chebwin_128_100')

References

Harris.F.J. "On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform." Proceedings of the IEEE. Vol. 66, 1978, pp. 51–83.

See Also

sigwin | window | wvtool

Tutorials

• Windows

How To

• Class Attributes
• Property Attributes

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