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From: rmd@gca-prism.com (Robert Dyas)
Newsgroups: comp.dsp
Subject: Time Varying Filters
Message-ID: <1991Jun14.221353.21886@gca-prism.com>
Date: 14 Jun 91 22:13:53 GMT
Organization: GC America / Prism Interactive Products
Lines: 15


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I'm working on a project which requires the use of time varying filters (ie. a filter
whose coefficients vary with time).  I'm aware of the potential problems but I need 
more information on the subject.  In particular I've found occasions when a change of
filter coefficients causes a DC bump in the output.  I was aware that this might
happen, but I would like to know the details of why this happens.  All the DSP
texts I have deal only with time invariant filters and shed no light on this topic.
Any help or pointers to articles and/or texts would be greatly appreciated.


Thanks -
Bob Dyas
PRISM Interactive Products