[Discuss-gnuradio] Freq_xlating filter parameter

[Dan Halperin]

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The comment for the filters gr.freq_xlating_fir_filter_XXX says (about
the parameter "center_freq"):

/*!
 * Construct a FIR filter with the given taps and a composite frequency
 * translation that shifts center_freq down to zero Hz.  The frequency
 * translation logically comes before the filtering operation.
 */

This implies that the frequency shift should be -center_freq, right?

I think I'm observing the opposite; that is, you pass in the desired
shift. All examples I can find that use this block pass in 0 as the
frequency shift; does anyone else have experience with this block that
can confirm or deny this?

Thanks!

Dan
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