15 Dec
2015
15 Dec
'15
8:23 p.m.
Fons Adriaensen <fons(a)linuxaudio.org> writes:
Just like DA converters can be upsampling, an AD
converter could
actually sample at a much higher rate than the nominal one and then
downsample digitally - for the same reason as the DA: it allows to use
a simpler analog antialising filter.
... and the popular card for SDR use was the Delta 44, which does
exactly that. In 96 kHz mode it really does have 96 kHz input
bandwidth:
http://www.nitehawk.com/sm5bsz/linuxdsp/hware/delta44.htm
In addition, having 4 inputs and 4 outputs means you can connect your
microphone and headphones at the same time -- which is obviously useful
for radio purposes!
Cheers,
--
Adam Sampson <ats(a)offog.org> <http://offog.org/>