www.pudn.com > voiceprocessingtoolbox.rar > fftRepeat01_old.m

% This example demos the effect of FFT approximation 
 
[y, fs]=wavread('welcome.wav'); 
x=y(2047:2126); 
 
runNum=5; 
for i=1:runNum, 
	repeatedX = x*ones(1,i); 
	repeatedX = repeatedX(:); 
	frameSize=length(repeatedX); 
	X = fft(repeatedX)/N; 
	magX = abs(X); 
 
	subplot(runNum,2,2*i-1); 
	plot(repeatedX, '.-'); grid on 
	title('x[n]'); 
	set(gca, 'xlim', [-inf inf]); 
 
	subplot(runNum,2,2*i); 
	freq = (0:frameSize/2)*fs/frameSize; 
	magX = magX(1:length(freq)); 
	plot(freq, magX, '.-'); grid on 
	title('DFS of x[n]') 
	axis tight; 
end