matlab写的数字信号处理源代码,里面包括最基本的fft计算

				% Chapter 05: Example-5.18: Overlap and save
%
n = 0:9;
x = n+1; Lenx = length(x);
h = [1,0,-1]; M = 3; M1 = M-1; L = N-M1;
N = 6; h = [h zeros(1,N-M)];
%
x = [zeros(1,M1), x, zeros(1,N-1)];
K = floor((Lenx+M1-1)/(L));
Y = zeros(K+1,N);
for k=0:K
	xk = x(k*L+1:k*L+N);
	Y(k+1,:) = circonvt(xk,h,N);
end
Y = Y(:,M:N)';
y = (Y(:))';