[Discuss-gnuradio] Efficient notch filters

[Marcus Leech]

Is there a way to produce an efficient notch filter with the bandpass
filter designer in Gnu Radio?

I'm seeing narrowband interfering signals that are in-band (with respect
to the bulk filtering in front
  of the receiver), and I want to notch one or more of them into
oblivion.  I'd previously used an
  FFT filter, and set zeros in the bins where I wanted notches, but it
wasn't very efficient.

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