blackman (Signal Processing Toolbox)

Blackman window.

Syntax

w = blackman(n)
w = blackman(n,sflag)

Description

w = blackman(n)

returns the n-point symmetrically sampled Blackman window in the column vector w. n should be a nonnegative integer. The equation for a Blackman window is

Blackman windows have slightly wider central lobes and less sideband leakage than equivalent length Hamming and Hanning windows.

w = blackman(n,sflag)

returns an n-point Blackman window using the window sampling specified by sflag, which can be either 'periodic' or 'symmetric' (the default). When 'periodic' is specified, blackman computes a length n+1 window and returns the first n points.

Algorithm

w = (0.42 - 0.5*cos(2*pi*(0:N-1)/(N-1)) + ...
0.08*cos(4*pi*(0:N-1)/(N-1)))';

Diagnostics

An error message is displayed when incorrect arguments are used:

Order cannot be less than zero.
Sampling must be either 'symmetric' or 'periodic'.

A warning message is displayed for noninteger n:

Warning: Rounding order to nearest integer.

See Also


`bartlett`	Bartlett window.
`boxcar`	Rectangular window.
`chebwin`	Chebyshev window.
`hamming`	Hamming window.
`hanning`	Hanning window.
`kaiser`	Kaiser window.
`triang`	Triangular window.

References

[1] Oppenheim, A.V., and R.W. Schafer. Discrete-Time Signal Processing. Englewood Cliffs, NJ: Prentice-Hall, 1989.

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