On Apr 3, 2010, at 11:56 PM, "Marcus D. Leech" <mle...@ripnet.com>
wrote:
Does firdes.band_pass *always* produce a working filter?
Yes, as long as the parameters are in order. If the filter is too
long, you might have a problem, but this is just a guess to cover my
blatant "yes." By too long, I mean huge and nothing I've run into.
I assume that it uses the Remez exchange algorithm to do its work.
What
happens if you ask for
for a filter that can't be realized?
Gr.firdes uses the windowed filter approach. You use blks2.optfir for
the Remez-based equiripple filters. Then, you'll be subjected to all
of those restrictions, but it should throw an exception if the Remez
can't converge.
Tom
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