Hi Marcus: Nice insights and plots.
> From: Marcus Müller > Date: Mon, 23 Oct 2017 20:10:23 +0200 [snip] > From the above figure, I'd say: go for 256 taps; 50 dB of anti- > aliasing should probably suffice. > On my machine, the 256 tap FIR filter with decimation=64 ran about > 20% faster than the fractional resampler; comparing what they do to > white noise, I'd say that whilst the spectral shape of the 256 tap > FIR is not perfect, the MMSE is pretty much unusable, I guess: I'd just like to interject here that GNURadio's MMSE filterbank is only MMSE for input spectral components in the range [-sample_rate/4, sample_rate/4]. Also it appears that the mmse/fractional_resampler blocks don't perform any explicit anti-alias filtering. So that's another reason to have a band-limiting filter out in front of it. -Andy _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
