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blackmanharris

Minimum 4-term Blackman-Harris window

Sintaxis

w = blackmanharris(N)
w = blackmanharris(N,SFLAG)


Description

w = blackmanharris(N) returns an N-point symmetric 4-term Blackman-Harris window in the column vector w. The window is minimum in the sense that its maximum sidelobes are minimized.

w = blackmanharris(N,SFLAG) uses SFLAG window sampling. SFLAG can be 'symmetric' or 'periodic'. The default is 'symmetric'. You can find the equations defining the symmetric and periodic windows in Algorithms.

Ejemplos

Blackman-Harris Window

Create a 32-point symmetric Blackman-Harris window. Display the result using wvtool.

N = 32;
wvtool(blackmanharris(N))

Algoritmos

The equation for the symmetric 4-term Blackman-Harris window of length N is

$$w(n)=a_0-a_1\cos \left(\frac{2\pi n}{N-1}\right)+a_2\cos \left(\frac{4\pi n}{N-1}\right)-a_3\cos \left(\frac{6\pi n}{N-1}\right),0\le n\le N-1$$

The equation for the periodic 4-term Blackman-Harris window of length N is

$$w(n)=a_0-a_1\cos \frac{2\pi n}{N}+a_2\cos \frac{4\pi n}{N}-a_3\cos \frac{6\pi n}{N},0\le n\le N-1$$

The periodic window is N-periodic.

The following table lists the coefficients:

Coefficient	Value
a0	0.35875
a1	0.48829
a2	0.14128
a3	0.01168

References

[1] harris, fredric j. “On the Use of Windows for Harmonic Analysis with the Discrete Fourier Transform.” Proceedings of the IEEE^® . Vol. 66, January 1978, pp. 51–83.

Capacidades ampliadas

Generación de código C/C++

Generar código C y C++ utilizando MATLAB® Coder™.

Usage notes and limitations:

Window length must be a constant. Expressions or variables are allowed if their values do not change.

Consulte también

Aplicaciones

• Window Designer

Funciones

• barthannwin | bartlett | bohmanwin | nuttallwin | parzenwin | rectwin | triang | window | wvtool

Introducido antes de R2006a