On Tue, Feb 17, 2015 at 7:22 AM, sreeraj r <rsree...@gmail.com> wrote:
> Hi, > > You can also look into Tom's blog on channelizers [1]. Some of the grc > files in the blog might not work out of the box (especially those ones with > QT-GUI frequency sink + bus ports). You can simply toggle the busports > and connect it properly and make it work. > > [1] http://www.trondeau.com/examples/2014/1/23/pfb-channelizers > -and-synthesizers.html > > Regards > Sreeraj Rajendran > > > On Mon, Feb 16, 2015 at 11:02 PM, Marcus D. Leech <mle...@ripnet.com> > wrote: > >> On 02/16/2015 04:54 PM, Ali Riaz wrote: >> >>> Hi Marcus, >>> >>> I was the one who posted a question on the usrp-mailing list regarding >>> the gnuradio companion channelizer a couple of days back, and was wondering >>> if you could help me on something. I tried using the filter as you >>> suggested, but I get a very strange result. I tried to get two partitioned >>> channels, but they're being partitioned in a very strange manner. I've >>> attached a photo for a visual for what I'm getting as a result. Any idea >>> why that's happening? >>> >>> P.S My apologies, I know you pointed me to the GNUradio discussion >>> mailing list, but it's been a while, and nobody has responded yet, and so >>> far all I have is your clue to go on. >>> >>> Thank you so much for all your help, really appreciate it. >>> >>> Best, >>> Ali >>> >>> This is very squarely in the domain of the discuss-gnuradio mailing >> list. >> >> My understanding is that the polyphase channelizer behaves that way for >> even-numbers of channels. Tom Rondeau on the discuss-gnuradio mailing list >> is the best person, probably, to explain this. I've copied that list. >> > Also, look at the documentation for the block: http://gnuradio.org/doc/doxygen/classgr_1_1filter_1_1pfb__channelizer__ccf.html Specifically, the set_channel_map function. It shows the mapping of the channels. With an even number of channels, the N/2 channel wraps around fs/2 and -fs/2 while channel 0 spans 0 Hz. You just have to set up your input bandwidth, sample rate, and tuning to account for this. Tom
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