I'd noticed a problem with running the M-Audio Revolution 7.1 sound card
at 192KHz as a source in Gnu Radio -- the spectrum was
all "funny", with the spectrum getting "reflected" about 48KHz,
almost as if the actual sample rate on the card wasn't correct, and
perhaps set to 96KHz instead of the expected 192KHz.
To eliminate Gnu Radio as a cause, I used "arecord" with the correct
parameters to record a 20-second chunk of audio from the card,
then used Gnu Radio to plot the spectrum. Sure enough, the spectrum
is still not correct, so I suspect this is a driver issue.
I *know* that I used to be able to use this card at 192KHz several years
ago, and the card advertises 192KHz sampling as a feature.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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