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MathGroup Archive 2007

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Apply filter to measured data

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75323] Apply filter to measured data
  • From: Oliver Friedrich <oliver.friedrich at tzm.de>
  • Date: Wed, 25 Apr 2007 05:35:37 -0400 (EDT)

Hallo,

I have lists of measured data

{{t0,f[t0]},{t1,f[t1]},...,{tn,f[tn]}}

where the samplepoints are not (!) distributed equidistant.

I want to apply an analog lowpass filter (1. order RC lowpass) to this list 
to get a list of the filtered signal. I have the Signals&Systems package, 
but the filters need to be applied to a function. So I turned these lists 
into InterpolationFunction objects, but they don't work together with the 
Signals&Systems toolbox. I tried to convert these InterpolationFunctions 
objects into the PiecewiseContinuousData objects, but this didn't work 
either with the filters.

Is there a way to use the Signals&Systems toolbox on such lists?

Thank you
Oliver Friedrich


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