Hi all,
Has anyone tested, or seen a believable spec for a
USB sound card that will sample at 192kHz and will actually pass through data
up to at least 80 kHz ? Many sound cards have a low pass filter at around 20kHz
even though they sample at 192, which is a bit pointless.
If anyone is interested, I’ve been using RME
Fireface 800 and 400 cards a lot recently. These generally a very good frequency
response to at least 90kHz. Unfortunately, my current application really
requires me to use USB not firewire.
People may also be interested to know that the clocks
in the RME cards aren’t great and they seem to sample about 0.5% slower
than you ask them to (either the clocks run slow, or the Firewire interface is
losing samples, I’m not sure). The consequences are that over an hour you
can lose several seconds of recording, which is important if you’re
trying to accurately time events based on a file start time and the number of
samples in a file.
Best,
Douglas.
==========================
Douglas Gillespie
Sea Mammal Research Unit,
Gatty Marine Laboratory,
University of St. Andrews,
Fife, KY16 8LB
Scotland.
The University of St Andrews is a
charity registered in Scotland
: No SC013532