hello, I have a plot of values from my fft function for a sinewave audio signal. I am now trying to analyze each peak in the plot to give me the sum of the peak and two other lower points on both sides of the peak. can anyone please help?
MATLAB: Find peaks.
fftplots
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Please change the 'amplitude peaks' section of your code to the following:
% amplitude peaks
[pks,locs] = findpeaks(mx(1:nfft/2),'SortStr','descend');n = min(n,length(pks));subplot(2,1,2);plot(f_fft,mx)hold onplot(f_fft(locs(1:n)),pks(1:n),'rv','MarkerFaceColor','r')xlabel('Frequency ')ylabel(' Amplitutde')
As far as I can tell, you're just doing this:
fm1 = ifft(fft(fx)/norm(fx).*y); figure(1) plot(abs(fm1)) fm2 = ifft(fft(fm1)/norm(fm1).*y);several times. So, just replacing that latter section of your code with a loop should work:
fm = ifft(fft(fx)/norm(fx).*y); figure(1) plot(abs(fm)) for i = 2:6 fm = ifft(fft(fm)/norm(fm).*y); figure(i) plot(abs(fm)) end
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