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[Discuss-gnuradio] freq_xlating_fir_filter_ccc


From: Marcus D. Leech
Subject: [Discuss-gnuradio] freq_xlating_fir_filter_ccc
Date: Wed, 21 Apr 2010 20:32:15 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

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
conflicting
  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 Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org






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