Time drift between 2 different data streams

[Michiel Spape]

Hi,
This is a weird problem, but I would assume (hope?) that the time you get from the simulator is the problem, not the one from E-Prime. If you think it's e-prime: do you have the latest version of 1 (1.2) or 2? Are you running E-Prime on some kind of laptop or computer with dynamic processor? 
Anyway, this is why, generally, if you use two different data streams, you synchronise more often - try to implement that. Scaling the clock is unlikely to work, since it's very probable that the time drift isn't linear, so if, for instance, the time drift occurred halfway during the experiment, a linear correction would make ALL your data invalid, rather than half of it.
Also, you could try send live pulses from E-Prime to the simulator and just use all the data in there (or vice versa). A bit of work, but it saves despairing afterwards.

Best,
Mich

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of francesco biondi
Sent: 21 March 2011 16:12
To: E-Prime
Subject: Time drift between 2 different data streams

Hello!!
I m using eprime in a experiment where a subject, driving a simulator,
has to use a microphone connected with a SRBox.
After merged the data from the 2 different data streams, i ve noticed
a time drift occurred between the 2 streams : e-prime times -
synchronized with the simulator times during the first part of the exp
- were drifted by the simulator times of 2.5 seconds at the end of the
experiment.
Do you know how i can solve this problem?
rescaling the eprime clock could help me?

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