On Apr 6, 2016, at 20:14, Philip Hahn <hah...@gmail.com> wrote: > Related question: I'm having trouble notch negative frequencies. I understand > it needs to be a complex->complex with complex taps but most of the filter > blocks don't seem to support this. In my case a band reject filter is what > I'm looking for to remove spurious noise. I guess the answer is to frequency > xlate, filter and then frequency xlate back?
This is just a limitation in some of the canned blocks, not in GNU Radio itself. Instead of picking a 'band reject filter' block, pick the 'FIR Filter' block (either the decimating or interpolating type, doesn't matter), and in the Taps field insert a call to firdes -- Huh. firdes doesn't have a complex band reject function. Well, you can use gnuradio.filter.firdes.complex_band_pass and apply standard techniques to turn the result into a band-reject filter: see http://www.dspguide.com/ch14/5.htm if you need info. > thank you Kevin, Please make sure to “reply all” (include the mailing list in your replies) so other people can follow the discussion and offer advice. -- Kevin Reid <http://switchb.org/kpreid/> _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
