www.pudn.com > voiceprocessingtoolbox.rar > fftZeroPadding02.m

% This example demos the effect of zero-padding of DFT 
L=5; 
for i=1:3 
	N=20*i; 
	x=[ones(1,L), zeros(1,N-L)]; 
	subplot(3,3,i*3-2); 
	stem(x); 
	title(sprintf('x[n] with N=%d',N)); 
	set(gca, 'xlim', [-inf inf]); 
 
	[mag, phase, freq]=fftOneSide(x); 
	subplot(3,3,i*3-1); 
	plot(freq, mag, '.-'); 
	title('Magnitude of DFT of x[n]') 
	set(gca, 'xlim', [-inf inf]); 
 
	subplot(3,3,i*3); 
	plot(freq, phase, '.-'); 
	title('Phase of DFT of x[n]') 
	set(gca, 'xlim', [-inf inf]); 
end