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Smooth Part of a Wave

Fri, 08/19/2016 - 07:24 am

I have a 1d wave which gets noisier as the index increases. If I use the same smoothing throughout the wave, there are features at low indices that get washed out. Can I weight the smoothing to only affect the part of the wave with higher index?

ajleenheer

You could use the Interpolate functionality which can incorporate a smoothing factor and a standard deviation wave. You'll need to make a wave with the same number of points that has an increasing "standard deviation" value as the index increases. For example if your source wave is "wave0", then you could create a "wgtWave" using Make/O/N=(numpnts(wave0)) wgtWave=p/100. Under Analysis-Interpolate, choose that wave as your Std Dev. You'll have to come up with reasonable estimates for the standard deviation scaling or play around with the smoothing factor.

August 19, 2016 at 01:10 pm - Permalink