How to find the start and end coordinates of main-lobe of rectangular window spectrum.
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The rectangular window spectrum is found like
M=66;
r=rectwin(M);
n=512;
r_fft=fft(r,n);
r_fft2=fftshift(r_fft);
r_fftdB=20*log10(abs(r_fft2));
figure
plot(1:n,r_fftdB)
title(M)
The plotted spectrum is
The spectrum is symmetrical about the peak of main-lobe. The starting of main-lobe is at coordinate 249. The ending of the main-lobe is at 265, The peak of main-lobe is at 257.
How to find the values of staring and ending coordinates of main-lobe (249,265 respectively)?
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