[open] Hardware for timing.
This is related to a previous question regarding temporal accuracy for sound presentation.
Myself and Gary, our excellent technician, have used an oscilloscope to measure the temporal accuracy of sound presentation.
Depending on the computer used we're seeing 30-90 ms out which is to be exected based on a previous discussion here. This is a consistent presentation time on each computer, which allowed us to try something.
We've come up with a technique to use frames that are presented as a buffer for the sound which means we can get it to present in a small sequence with an accuracy of 5ms either side of the intended time. So it ranges from 100% accurate to 5ms below or above.
The thing is when we use this approach in a larger and more complicated sequence (which puts more demand on processing) the visual timings are no longer consistent.
We think this is likely a hardware problem.
I'm planning on requesting new hardware to address these issues. We need visual and audio accuracy and probably a kick-ass processor.
I was wondering if anyone here could give me an idea of what might be a good system to set up to best address these needs.
Tomorrow will be the deadline for departmental requests otherwise I'll be paying for the equipment out of my own pocket, so if anyone can help by then it would be great.
ADDITIONAL QUERY: I think I have my visual stimuli drawn outside the screen size and OpenSesame resizes it on each call. Would this be the main cause of the frames being dropped that are being reported? I plan on changing this anyway.