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 |
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| 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
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