Re: [Discuss-gnuradio] gr.firdes.band_pass

[Tom Rondeau]

On Apr 3, 2010, at 11:56 PM, "Marcus D. Leech" <address@hidden>  
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