DAQCard Antialiasing from David Antliff on 2002-09-23 (gmane.linux.comedi)

From: David Antliff <dave.antliff_at_paradise.net.nz>
Date: Mon, 23 Sep 2002 16:53:05 +1200 (NZST)

I am using a National Instruments DAQCard-AI-16XE-50. When using the
comedi drivers to acquire data, for example across 16 channels at a
combined sampling rate of 16kHz (1kHz per channel), does the DAQ card have
a built-in anti-aliasing filter that is applied to each channel with a
(realisable) brick wall characteristic out to 500Hz? And if I increase the
comedi sampling rate to, say, 1200Hz, does the filter adjust (to 600Hz)?

Or does the device have no usable front-end antialiasing (or perhaps just
a fixed antialias filter at something like 20kHz?). I realise it's
important to consider aliasing anyway regardless, but this is something
I've been wondering about for some time.

Thanks,

David Antliff
Design Engineer
Med-Dev Ltd.
Wellington, New Zealand

Received on 2002-09-23Z03:53:05