hann

Hann (Hanning) window

所有的页面崩溃

Syntax

w = hann(L)

w = hann(L,sflag)

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

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

Open Live Script

Create a 64-point Hann window. Display the result usingwvtool.

L = 64; wvtool(hann(L))

Window length, specified as a positive integer.

Data Types:single|double

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,hanncomputes a window of lengthL+ 1 and returns the firstLpoints.

Hann window, returned as a column vector.

The following equation generates the coefficients of a Hann window:

$w (n) = \begin{matrix} 0.5 (1 - \cos (2 π \frac{n}{N})), & 0 \leq n \leq N \end{matrix} .$

The window lengthL=N+ 1.

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