Losing sound during paradigm

[David Hairston]

FYI folks, just for the record, this was a hardware-related sound card
issue.  Apparently, for playing very fast, very short sound clips, many
cards will either give an artifact or clip the sound - doing some
research, found that many functionally have a 8-10 ms minimum.
We ended up using a new Sound Blaster Audigy 2 card, it works flawlessly
w/ great re-production and virtually zero delay.

W. David Hairston
Neurobiology and Anatomy
 
Wake Forest University School of Medicine
Winston-Salem, NC 27157
(336) 716-4481 (lab)

-----Original Message-----
From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On
Behalf Of David Hairston
Sent: Tuesday, April 20, 2004 10:54 AM
To: eprime at mail.talkbank.org
Subject: Losing sound during paradigm

I am having an issue with "losing" my sound after ~25 trials in my
paradigm, no clue why.  I am presenting very short (AKA 10 ms) sound
clips 2 times w/ only ~33-66 ms between (2 screen refreshes...).
Anyhow, this problem dosn't occur on all machines (thus far, ONLY on the
experimental PC, Ugh!), and, as mentioned, it will run the first several
trials fine, then the sound just stops, no complaints... when it
finishes running, I have sound in Windows (XP) as usual.
I am thinking it must be overfilling some buffer, but have no idea how
to check/remedy this situation? Oh, and all the sounds are pre-relesead
by 100 ms, and are only 8.bits per sample @22kHz, single channel.  Any
suggestions as to what is going on?