title: Very narrow FFT window functions?
body: <p>What are the flat-top window functions that provide the narrowest lobe width?</p>
  
  <p>I'm doing FFT analysis and I need the resulting main lobe of a sine wave to be as narrow as possible but avoiding scalloping loss. I ask for flat-top functions because these are best for scalloping reduction. I don't mind sidelobes, even the rectangular window is good enough for me if it wasn't for its massive scalloping...</p>
  
  <p>Right now I'm using the SFT3M window from this paper:<br />
  <a href="http://www.rssd.esa.int/SP/LISAPATHFINDER/docs/Data_Analysis/GH_FFT.pdf" rel="nofollow noreferrer">http://www.rssd.esa.int/SP/LISAPATHFINDER/docs/Data_Analysis/GH_FFT.pdf</a></p>
  
  <hr>
  
  <p>PS. I asked this question there too:<br />
  <a href="https://math.stackexchange.com/questions/524617/very-narrow-fft-window-functions">https://math.stackexchange.com/questions/524617/very-narrow-fft-window-functions</a><br />
  I probably made a mistake, I have the feeling that I haven't posted in the correct website.</p>