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[Discuss-gnuradio] USRP Custom Filter Taps
From: |
Daniel Garcia |
Subject: |
[Discuss-gnuradio] USRP Custom Filter Taps |
Date: |
Wed, 27 Sep 2006 21:50:26 -0700 (PDT) |
I am working on an NTSC receiver using the USRP/TVRX board. I am tunning the
board to 63.25 MHz with decimation set to 10; this gives me 6.4 MHz of
bandwidth. The NTSC channel is 6 MHz wide so with these settings I get some
interference from the adjacent channels.
Is there a way to set the filter taps used by the USRP so that I could make a
filter to remove the frequency infomation at the extreme right and left of the
sampled data? I can use an FIR filter in the PYTHON runtime but it uses lots of
CPU power.
I read on a previous thread that it is possible to invert the spectrum of the
sampled signal so that the tuned frequency would be the FM carrier. The end
result being a stream from the USRP where 0 Hz is the center frequency of the
audio carrier the the video carrier is at 4.5 MHz. Is this possible? The
advantage here is that the baseband audio does not need to be shifted before fm
demodulation; also the video carrier does not need to be shifted before
demodulation (AM).
Regards,
Daniel
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