[visionlist] Signal delay in D-Sub, DVI and HDMI

[Bosco Tjan]

HDMI to DVI-D conversion is just a set of wires.  There is no electronics and no perceivable delay as far as the converter is concerned.  A HDMI source is required to recognize a DVI-D device and send out the appropriate signal.

There can be delay between the two video outputs on the graphics card, (but unlikely if you run them in mirror mode and at the same refresh rate. Check with a photodiode and an oscilloscope if you want to be sure, or just put the screens side-by-side, display a flickering stimulus to both, and look.

Regards,
Bosco
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Bosco Tjan, Ph.D.
Associate Professor of Psychology
& Neuroscience Graduate Program
3620 South McClintock, SGM 501
University of Southern California
Los Angeles, CA 90089-1061
Email: btjan at usc.edu
Tel: 213-821-2953/4
Fax: 213-746-9082
Web: http://tlab.usc.edu
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On Jul 12, 2012, at 11:00 AM, Bernhard Fink wrote:

> Why don't you use a splitter for the video signal?
> 
> Dr. Bernhard Fink
> Emmy-Noether-Research Group
> Department of Sociobiology/Anthropology and
> Courant Research Center 'Evolution of Social Behavior'
> University of Göttingen
> Kellnerweg 6
> 37077 Göttingen
> Germany
> Email: bernhard.fink at ieee.org
> web: www.evolutionary-psychology.de 
> 
>> -----Ursprüngliche Nachricht-----
>> Von: visionlist-bounces at visionscience.com [mailto:visionlist-
>> bounces at visionscience.com] Im Auftrag von Pawel Nawrot
>> Gesendet: Donnerstag, 12. Juli 2012 18:59
>> An: visionlist at visionscience.com
>> Betreff: [visionlist] Signal delay in D-Sub, DVI and HDMI
>> 
>> Hi everyone,
>> 
>> I would like to connect 2 LCD computer screens (monitors) to one PC by 2
>> cables each with a length of 5 meters. Most of graphic cards provide one
>> D-Sub, one DVI and one HDMI port. In my experiment I have to present the
>> same stimulus in the same time on each screen. My question is: will there
>> be any time difference in transfering the image by cable connected to D-
>> sub and DVI slot? The first one is analog port and DVI/HDMI are digital.
>> In my view, I should use DVI and HDMI to provide the same latency on each
>> screen (I am not sure that these 2 different ports and cables provides the
>> same transfer speed). The problem is, I do not have monitor with HDMI
>> port. If I use adapter HDMI-->DVI will it not change the time of
>> transfering the data?
>> 
>> Thank you in advance for all replies!
>> 
>> --
>> Paweł Nawrot MSc, PhD Student
>> 
>> pawel.nawrot at amu.edu.pl
>> 
>> Laboratory of Vision Science and Optometry
>> Ul. Umultowska 85
>> 61-614 Poznań, Poland
> 
> 
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