?? coarsemeyerwindow.m
字號:
function [index, window] = CoarseMeyerWindow(L,deg);
% CoarseMeyerWindow: Evaluates a lowpass Meyer window
% Usage:
% [index, window] = CoarseMeyerWindow(L,deg);
% Inputs:
% L Scale (integer)
% deg Degree of the polynomial
% Outputs:
% index Location of the window on the time axis
% window Low-frequency Meyer window
pio2 = pi/2;
dyadic_points = [1 2^L];
eps = floor(dyadic_points(1)/3);
epsp = floor(dyadic_points(2)/3);
lmidind = [ dyadic_points(1) : dyadic_points(2)-epsp ];
rmidind = [ dyadic_points(2)-epsp+1 : dyadic_points(2) ];
rghtind = [ dyadic_points(2)+1 : dyadic_points(2)+epsp+1 ];
farrghtind= [ dyadic_points(2)+epsp+2 : 2*dyadic_points(2)];
lmid = ones(1,length(lmidind));
rmid = cos(pio2*WindowMeyer((3/2)*((rmidind-1)/dyadic_points(2))-1,deg));
rght = cos(pio2*WindowMeyer((3/2)*((rghtind-1)/dyadic_points(2))-1,deg));
farrght = zeros(1,length(farrghtind));
index = [lmidind rmidind rghtind farrghtind] -1;
window = [lmid rmid rght farrght];
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