i want frequency domain spectrum of an audio file but i am not getting right frequency range. it is showing freq. range upto 100 kHz but i want to get it upto 10 kHz. what is the problem in frequency range?

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anjali parashar
anjali parashar 2013-4-25
yfft=fft(y); % fft of original signal
f=-length(y)/2:length(y)/2-1;
k=20*log10(abs(yfft));
plot(f,k);

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Honglei Chen
Honglei Chen 2013-4-25
Your f is incorrect, assuming the number of elements in y is even, it should be
N = length(y);
f = (-1/2:1/N:1/2-1/N)*fs;
where fs is the sample rate. Whether it maps to 10 kHz or not depends on your sample rate.

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