On 06/19/2018 10:28 AM, Nives Novković via USRP-users wrote:
Hi everyone,
me again with the questions. :) Next thing I am trying to learn is
RFNoC FIR filter. I see that the only thing I can modify for the
filter is filter taps. Is there any official documentation on those
blocks? I am trying to figure out what values should I enter there if,
i.e. I want to eliminate all the frequencies above 100 kHz. Those are
actually coefficients in the FIR filter equation? Here is my current
flow graph.
fir_filter_flow_grc.png
Kind regards,
Nives
The RFNoC FIR filter takes a list of ints that can be scaled from a
floating-point representation of the filter.
Gnu Radio includes the firdes routines for producing coefficients for
simple low-pass/high-pass/band-pass filters. One you have the results,
you can just use a simple Python expression to scale by 32767.0 and
convert to int. Something like:
[int(i*32767) for i in filter_coeffs]
Keep in mind that the RFNoC FIR filter is, last I checked, limited to 41
filter coefficients
_______________________________________________
USRP-users mailing list
USRP-users@lists.ettus.com
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
