Hi,
the E-MU Tracker Pre is a USB powered audio interface with 192kHz
sampling. The frequency range is flat up to 90 kHz and the
anti-aliasing filtering is pretty good. With high level signals
exceeding 96 kHz (in the range 96 to 105 kHz) you can get aliased
components in the range 96 to 87 kHz. Graphs will be shown soon on our website.
This interface has only analog I/O. At max gain the mic inputs accept
levels up to 18mVpp (measured between pins 2 and 3 of the XLR input).
Gianni Pavan
At 10.32 29/11/2008, you wrote:
Hi,
I have successfully tested the E-MU 0404 USB 2.0 Audio/MIDI Interface:
http://www.emu.com/products/product.asp?category=610&subcategory=611&product=15185&nav=features
It's frequency response is flat up to 90 kHz. Unfortunately, it is
not BUS-powered, which means that it requires an external power adapter.
The frequency response and anti-aliasing characteristics of such
audio interfaces are primarily determined by the A/D converter chips
in them. The above unit employs the AK5385A chip, whose pass-band
filter characteristics (at fs=192 kHz) can be found at page 10 of
the data sheet: http://pdfdata.datasheetsite.com/pdf1/AKM/AK5385A.pdf.
Regards,
Raimund
------------------------------------------
Raimund Specht
Avisoft Bioacoustics
Kirchstr. 11
13158 Berlin
Germany
tel +49 30 48476986
fax +49 30 48476987
<mailto:raimund.spe...@avisoft.com>raimund.spe...@avisoft.com
www.avisoft.com
------------------------------------------
----- Original Message -----
From: <mailto:d...@st-andrews.ac.uk>Douglas Gillespie
To: <mailto:Bioacoustics-L@cornell.edu>Bioacoustics-L@cornell.edu
Sent: Thursday, November 27, 2008 11:41 AM
Subject: 192 kHz USB sound cards
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
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Gianni Pavan
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA
Phone +39-0382-987874 Fax +39-02-700-32921
Email gpa...@cibra.unipv.it, gianni.pa...@unipv.it
Web http://www.unipv.it/cibra
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