This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/osmocom-sdr@lists.osmocom.org/.
Francesco Gugliuzza f.gugliuzza at hacklabproject.org2012/7/15 Michael Karcher <osmosdr at mkarcher.dialup.fu-berlin.de>: > Good point, but actually, I am sure it is not an effect of the tuner > output filter. My USB stick contains a fc0012 tuner, which is always set > to 6MHz bandwidth. The bandwidth of the suspected anti-alias filter > changes clearly when I change the sample rate, though, on the other > hand, if I manipulate the FIR coefficients to contain sharp dips in the > range of hundred kHz, the dip position does not change when I change the > sample rate. This makes me cofident that the suspected anti-alias filter > has to be located in or after the resampling unit. The only thing I can think of now is the raised cosine filter used in digital modulation receivers, but IMHO that should be implemented in the FIR filter. -- Francesco Gugliuzza HackLabProject.org Administrator Linux user #374630 Tel (VoIP geographic number): +39 0921440446 Tel (Libera il VoIP number): 5125320 E-mail: f.gugliuzza at hacklabproject.org