window.m

进行时频变换的工具箱

function h=window(N,name,param,param2);
%WINDOW	Window generation.
%	H=WINDOW(N,NAME,PARAM,PARAM2)
%	yields a window of length N with a given shape.
%
%	N      : length of the window
%	NAME   : name of the window shape (default : Hamming)
%	PARAM  : optional parameter
%	PARAM2 : second optional parameters
%
%	Possible names are :
%	'Hamming', 'Hanning', 'Nuttall',  'Papoulis', 'Harris',
%	'Rect',    'Triang',  'Bartlett', 'BartHann', 'Blackman'
%	'Gauss',   'Parzen',  'Kaiser',   'Dolph',    'Hanna'.
%	'Nutbess', 'spline'
%
%	For the gaussian window, an optionnal parameter K
%	sets the value at both extremities. The default value is 0.005
%
%	For the Kaiser-Bessel window, an optionnal parameter
%	sets the scale. The default value is 3*pi.
%
%	For the Spline windows, h=window(N,'spline',nfreq,p)
%	yields a spline weighting function of order p and frequency
%	bandwidth proportional to nfreq.
%
%	Example : h=window(256,'Gauss',0.005); plot(h);
%
%	See also DWINDOW.

%	F. Auger, June 1994 - November 1995.
%	Copyright (c) 1996 by CNRS (France).
%
%	------------------- CONFIDENTIAL PROGRAM -------------------- 
%	This program can not be used without the authorization of its
%	author(s). For any comment or bug report, please send e-mail to 
%	[e-mail] 
%
%	References : 
%	- F.J. Harris, "On the use of windows for harmonic
%	analysis with the discrete Fourier transform",
%	Proceedings of the IEEE, Vol 66, n