On Thu, May 28, 2009 at 2:44 PM, Dave Tweed wrote: > > In a way, it's the discrete-time version of what a superheterodyne > receiver does in continuous time. > > -- Dave Tweed > D'oh I knew this in RF terms. I had never thought it worked like that in the Z domain. I learn something new every day. - Martin -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist