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hann

Hann (Hanning) window

Sintaxis

w = hann(L)

w = hann(L,sflag)

Descripción

w = hann(L) returns an L-point symmetric Hann window.

w = hann(L,sflag) returns a Hann window using the window sampling specified by sflag.

Ejemplos

Hann Window

Create a 64-point Hann window. Display the result using wvtool.

L = 64;
wvtool(hann(L))

Argumentos de entrada

L — Window length

positive integer

Window length, specified as a positive integer.

Tipos de datos: single | double

sflag — Window sampling

'symmetric' (predeterminado) | 'periodic'

Window sampling, specified as one of the following:

• 'symmetric' — Use this option when using windows for filter design.

• 'periodic' — This option is useful for spectral analysis because it enables a windowed signal to have the perfect periodic extension implicit in the discrete Fourier transform. When 'periodic' is specified, hann computes a window of length L + 1 and returns the first L points.

Output Arguments

w — Hann window

column vector

Hann window, returned as a column vector.

Algoritmos

The following equation generates the coefficients of a Hann window:

$$w(n)=\begin{array}{cc}0.5\left(1-\cos \left(2\pi \frac{n}{N}\right)\right),& 0\le n\le N\end{array}.$$

The window length L = N + 1.

Referencias

[1] Oppenheim, Alan V., Ronald W. Schafer, and John R. Buck. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 1999.

Capacidades ampliadas

Generación de código C/C++
Generar código C y C++ utilizando MATLAB® Coder™.

Consulte también

Aplicaciones

• Window Designer

Funciones

• blackman | flattopwin | hamming | window | wvtool

Introducido antes de R2006a