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From: | Philip Hahn |
Subject: | Re: [Discuss-gnuradio] time triggered filter |
Date: | Wed, 6 Apr 2016 20:27:24 -0700 |
On Apr 6, 2016, at 20:14, Philip Hahn <address@hidden> 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,
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