On Jun 24, 2011, at 8:22 AM, "Marcus D. Leech" <mle...@ripnet.com> wrote:
> On 06/24/2011 01:14 AM, Colby Boyer wrote: >> >> >> >> Hi Marcus, >> >> Check out a pfb channelizer! >> >> gnuradio-core/src/python/gnuradio/blks2impl/pfb_channelizer.py is a >> nice python wrapper for the class and gr_pfb_channelizer_ccf is the >> C++ name. >> >> Also if you need to carve out a a shifted part of the spectrum, use >> the gr_freq_xlating_fir_filter_*** block. >> >> These are polyphase implementations so they should be computationally >> efficient. Lastly, if you need even more efficiency you can see if >> they are doing the fft implementation of filtering (not sure if they >> are vs standard computation). As you know, there is the difference >> between NlogN and N^2 >> >> --Colby > Right, so how do I set the filter taps for the PFB channelizer? Is it > just a low-pass filter, or something > else? > > > -- > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org It's a low pass filter where the bandwidth is the width (or less) of the channel, W, and the sample rate is that of the input signal, which is WxN for the N channels. By default, the channelized will output channels of bandwidth W at sample rate W. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
