how to measure the sound latency?

[David McFarlane]

HanGue,

Get an oscilloscope, a sound file with a sharp attack, and an E-Prime 
computer with a simple digital output (e.g., a legacy parallel 
port).  Use the E-Prime Onset/OffsetSignal facility to output a 
signal to the digital I/O port at the onset of your SoundOut object 
(see, e.g., Slide.OnsetSignalEnabled in the E-Basic Help facility).

Hook up your oscilloscope input to the audio output of the EP 
computer, and the oscilloscope trigger to the digital I/O port.  Now 
run your program to see the latency between object onset and sound onset.

As I understand it, this is pretty much what PST did, except they 
used the Black Box Tool Kit which allowed them to automate this test 
and rapidly collect repeated samples.  Perhaps you could contact PST 
for details.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (twitter.com/EPrimeMaster)


At 5/7/2012 09:33 AM Monday, you wrote:
>Hallo,
>
>Is there a way to measure the sound latency?
>between the time when the E-Prime calls a sound to play and the time 
>when the sound actually emits from the soundcard or speaker.
>
>I want to give a sound feedback in a precise time after a button press event.
>So, we used 'SoundBuffer Object' and played in InLine object.
>
>Just what I know is that i read from this site 
>(http://www.pstnet.com/eprimestartup.cfm).
>and download the soundtest file 
>(http://www.pstnet.com/support/kb.asp?TopicID=4348).
>there was no issue with this test
>
>Best,
>HanGue.

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