idfs.m

数字信号处理的比较全面的程序代码

function [xn]=idfs(Xk,N)
% calculate the idfs of Xk
%[xn]=idfs(Xk,N)
%------------------------
%
n=[0:1:N-1];
k=[0:1:N-1];
WN=exp(-j*2*pi/N);
nk=n'*k;
WNnk=WN.^(-nk);
xn=(Xk*WNnk)/N;