> Can you provide a reference or two (on-line preferably) to digital
filtering?

No, but I'm sure you can find one with a little searching.  You'll probably
also get ten references in the next day here.  I learned this stuff from
hard printed material and teachers before there was a web.  Thank you
professors Fredricks and Carlson.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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