Filter design

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?

Thanks. Best,
Daniele

On 23/07/2014 14:01, Daniele N. wrote:

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

On Wed, Jul 23, 2014 at 8:29 AM, Daniele N. [email protected]
wrote:

Cheers,
Daniele

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

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

Tom