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How I can smooth my fourier amplitude spectra

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Khalid Mahmood
Khalid Mahmood 2013-12-30
评论： Khalid Mahmood 2014-1-3
How to smooth an earthquake fourier amplitude spectra for better interpretation.

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回答（1 个）

Wayne King
Wayne King 2013-12-30
You can use pwelch() or pmtm() to obtain a smoothed nonparametric estimate. This is recommended, alternatively you can use a parametric method to get a really smooth spectrum, but very sensitive to model misspecification.
Please attach data and the sampling rate and I can show you how to use pwelch() and pmtm().
Both require the Signal Processing Toolbox.
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Wayne King
Wayne King 2013-12-30
Is this the time data or the Fourier amplitude spectrum? It looks like it is the Fourier magnitudes in which case that is very smooth already.
Khalid Mahmood
Khalid Mahmood 2014-1-3
Dear King this is fourier amplitude spectrum. I am interested to get a smooth line on this for better interpretation. Thanks\

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