Trigger Timing in Audio Loop

paranoia23

hi folks

i did a loop with a audio ping and recognized that the timing between the loops is varying a little .. its audible and the trigger inputs also slow a minimal shuffle while i didnt activated the shuffle feature ... any ideas?

paranoia23

should be show not slow -_-

paranoia23

is it just me with this "problem" ?!

eduard

Hi Paranoia,

Did you use the Opensesame loop and sequence items to make your loop? If so, there will be a jitter due to the prepare-run-strategy that Opensesame uses (see here) If you have everything in only one phase, this jitter is quite a bit reduced.

Btw. how big is this jitter? and why exactly is it a problem for you?

Thanks,

Eduard

paranoia23

hi eduard

i use the sequence item because i also need a trigger signal for every audio signal.

the jitter is audible and it is not a problem per se ... but i was just curious how precise the timing of the trigger signal is.. because my research is quite time critical

thanks for your reply !

hike

Auditory timing is a problem on opensesame. Look here for some explanation --> http://forum.cogsci.nl/index.php?p=/discussion/2007/auditory-timing-accuracy-on-mac
You might want to play around with PyAudio or Pyo