Re: [Discuss-gnuradio] FIR filter design function

[Matt Ettus]

Dominik Auras wrote:
> Hi!
>
> If I design filters, what gnuradio module do I prefer:
> - optfir
> - gr.firdes
> ?
>
> It seems to me that you use gr.firdes in newer code, but optfir allows
> me to specify more filter parameters.
>   

firdes creates windowed filters, and is always guaranteed to give you a
working filter.  optfir uses the Parks-McClellan algorithm, and can
produce better filters.  However, if you ask too much of it, it will
fail, since the algorithm is not guaranteed to converge.

Matt