Re: [Discuss-gnuradio] Filter design

On Wed, Jul 23, 2014 at 8:29 AM, Daniele Nicolodi <daniele@grinta.net> wrote:

On 23/07/2014 14:01, Daniele Nicolodi wrote:
> Hello,
>
> GNURadio offers three different interfaces to design filters from Python
> code: gnuradio.filter.firdes.xxx, gnuradio.filter.firdes.xxx_2, and
> gnuradio.filter.optfir.xxx.
>
> The three interfaces use different parameters to specify the filter
> properties, but the only obvious difference is that the optfir is coded
> in python and thus not available to be used elsewhere.
>
> Which one is recommended to use? Can anyone suggest a reference that
> explains how the filter taps are computed?
>
> In my data analysis code I usually use Butterworth filters. If there is
> any analogy, how do those map to the filters designed with the above tools?

Partially answering my own questions:

http://gnuradio.squarespace.com/examples/2010/9/12/basic-filtering.html

Cheers,

Daniele

There's also the manual page on filtering in GR:

http://gnuradio.org/doc/doxygen/page_filter.html

Tom