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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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