Ok, so I have an input audio chunk, from DC-48KHz, sampled at 96KHz.

I want to extract 20KHz to 32KHz, and shift this down to DC (DC-12KHz).
I think I need the freq_xlating_fir_filter_ccc() block, but I’ve seen
information about how to use this block.

In GRC, what parameters do I give to this block? The FIR filter is
applied after downconversion,
correct? But that filter “runs” at the input sample rate (prior to
decimation) correct?

If I want to grab 20KHz to 32KHz, do I tell the block that my center
frequency is 26KHz?
(20KHz + output_bandwidth/2)?

Call me confused.

Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium