You are here : matlabSignal Processinghann

hann() - Signal Processing

w = hann(L) returns an L-point symmetric Hann window in the column vector w. L must be a positive integer.

The window length is L=N+1.

w = hann(L,'sflag') returns an L-point Hann window using the window sampling specified by 'sflag', which can be either 'periodic' or 'symmetric' (the default).

The 'periodic' flag is useful for DFT/FFT purposes, such as in spectral analysis.

The DFT/FFT contains an implicit periodic extension and the periodic flag enables a signal windowed with a periodic window to have perfect periodic extension.

When 'periodic' is specified, hann computes a length L+1 window and returns the first L points.

When using windows for filter design, the 'symmetric' flag should be used.

Note : If you specify a one-point window (L=1), the value 1 is returned.


Syntax

w = hann(L)
w = hann(L,'sflag')


Example

%Hann Window Create a 64-point Hann window. Display the result using wvtool.
L = 64;
wvtool(hann(L))


Output / Return Value


Limitations


Alternatives / See Also


Reference