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From: dclark@hpscdc.scd.hp.com (David Clark)
Newsgroups: comp.dsp
Subject: Re: resampling problem
Message-ID: <10620001@hpscdc.scd.hp.com>
Date: 19 Feb 91 17:23:55 GMT
References: <1991Feb13.234510.22488@nuchat.sccsi.com>
Organization: Hewlett-Packard, Santa Clara Div.
Lines: 17

I once used the method you suggest for filtering a non-uniformly sampled
signal (compensating the gain by also filtering the sampling function).
It works pretty well, but not perfectly.  If the sample rate changes
instantaneously and dramatically (like 10x), then the distortion is clearly
visible.  However, for "reasonable" non-uniformities the distortion is not
visibly perceptible, and that was good enough for my needs.

You do need to make sure that the filter's impulse response width is at
least several times the the maximum sampling interval.

Unfortunately, I don't have the math expertise to rigorously analyze this
technique -- I got by on intuition and simulation.  If you do find a
thorough analysis, please post it.

- David Clark
  Hewlett-Packard Co.
  Santa Clara, CA