Re: Finding Asymptotes from a set of data

From: john <john@xxxxxxxxxxxx>
Date: Fri, 06 Jan 2006 23:51:41 +0000

WAYNEL wrote:

Hi

Can anyone help me find asymptote from a set of data in two column x
and y that show the frequency responce of a say a RC network (e.g. bode
plot)?
Finding it from a function seem relatively easy but without a model for
the data is there a method of finding two lines that meet to produce
the turning point?


Cheers


WayneL

If it can't be done with a ruler and pencil on a graph, one procedure is to model it as an all-pole filter, H(s) = 1/(Polynomial in s), then vary the pole location(s) in the s-plane to get a best fit to the sampled FR. Finding the best number of poles could be problematic

john
.

References:
- Finding Asymptotes from a set of data
  - From: WAYNEL

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