[visionegg] Re: Hardware for Vision Egg
- From: Christophe Pallier <pallier@xxxxxxxxxxxxx>
- To: visionegg@xxxxxxxxxxxxx
- Date: Wed, 05 Nov 2003 13:02:56 +0100
Also, I did some preliminary tests with portaudio (a cross-platform
realtime sound API) as a trigger output, and it had 20-100 msec
latency on Windows XP with motherboard audio. This is worse than
parallel port performance, so I gave up. However, there is low-latency
audio hardware available (e.g. using ASIO drivers by Steinberg) which
might make a huge difference. Also, it is possible that Mac OS X
systems would have better latency through the audio path.
Maybe it not reasonable to expect too much from motherboard audio, I do
not know...
Anyway, I fear that one will always have to test and calibrate the
timing for each audioboard (and driver).
For linux and MacOS X, Jackit may be an interesting project to try and
get low latency audio (as ASIO under Windows)
See http://jackit.sourceforge.net/docs/faq.php
But it is not compatible with Windows...
As an aside, it is somewhat worrying that parallel ports will no
longer be around at some point in the future.
Quite worrying indeed.
Yet, I found a company that sells USB response boxes (cf.
http://192.131.102.99/rurb/tech.html) and, if I understood correctly an
email they sent me, there would be a systematic (i.e. constant)
20millisecond delay between the key press and the registration by the
USB system. If true, this would be not too bad for many situations, even
if there are cases where this may not be sufficient.
Christophe Pallier
www.pallier.org
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