How do you determine the size of taps? How much of a difference does setting the transition width from 1MHz to 10MHz make?
On Tue, Nov 19, 2013 at 6:40 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > I really appreciate the detailed explanation. I tried running >> gr_filter_design last night and it asked me to install SciPy, which I did >> not feel like doing at that time. I will try using 1MHz for my band, which >> may help get rid of the real-time running issue. >> >> Again, I appreciate your help with this matter. >> > Let's say you get a filter that's, oh, I dunno, 100 taps long. That > filter has to process every sample, so, that's 5e7 X 100 taps, or > roughly 5e9 FLOP/second. Just for that one filter. And your flow-graph > is likely doing other things *and* it's having to get samples > all the way through your network or USB stacks into the application > layer as well, call that 100 instructions/sample. So, that's > 5e7 x 100 = 5e9 OPS/second just to get your samples into the > application. You're going to burn-up the cycles on your CPU pretty > quickly at 50Msps, even for doing "trivial" things. > > > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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