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difx:difx-sfxc_comparison

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difx:difx-sfxc_comparison [2015/11/19 14:35]
adamdeller
difx:difx-sfxc_comparison [2015/11/20 15:44] (current)
adamdeller
Line 36: Line 36:
 This shows the result of a zero-padded FFT, no windowing.  The peak is the same height, but the noise is marginally reduced. This shows the result of a zero-padded FFT, no windowing.  The peak is the same height, but the noise is marginally reduced.
  
-{{:difx:verification:zeropadded.png?500|}}+{{:difx:verification:windowed.png?500|}}
  
 This shows the result of windowed-overlapped FFT (Hamming window), no zero padding.  The peak goes up but it is sitting on a plateau of higher noise.  If you just estimate the noise globally, then the S/N seems higher, but if you use an estimate of the local noise in the vicinity of the peak, the S/N is the same. This shows the result of windowed-overlapped FFT (Hamming window), no zero padding.  The peak goes up but it is sitting on a plateau of higher noise.  If you just estimate the noise globally, then the S/N seems higher, but if you use an estimate of the local noise in the vicinity of the peak, the S/N is the same.
difx/difx-sfxc_comparison.txt · Last modified: 2015/11/20 15:44 by adamdeller