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?

yfft=fft(y); % fft of original signal

f=-length(y)/2:length(y)/2-1;

k=20*log10(abs(yfft));

plot(f,k);

Answer 1

[Honglei Chen]

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.