Auditory Recording and Onset timing

[David McFarlane]

Sylvain,

I don't know that anyone has explored sound recording latency before, 
so thanks for doing that and posting your observation.  I wonder if 
this is a limitation of E-Prime in particular, or a limitation of 
computer sound recording in general?  If the latter, it will dash the 
hopes of people who want to measure RT directly by sound recording 
(e.g., https://groups.google.com/d/topic/e-prime/1kiOTrj3huk ).

Please ask PST Web Support about this at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and post back 
here with their response.  And I will bring this up with the PsychoPy 
folks (in fact, I have been asked to explore this very issue with one 
of their top developers this week).

-- David McFarlane


At 3/2/2013 03:54 AM Saturday, Sylvain wrote:
>Hello,
>
>I'm trying to do the same thing with EP2 and a Slide with:
>- a Slidetext sub-object disappearing at the vocal answer of the 
>participant. The microphone for this one is plugged to the SRSBox.
>- a SlideSoundIn sub-object recording 1000 of the answer from the 
>onset of the slide. The microphone for this one is plugged to the computer.
>
>
>I tried that on two different computers: on the first one I had 
>almost the same RT recorded by the SRSBox and after processing of 
>the wav file to check for onset. On the second on the RT recorded by 
>the SRSBox is 50-100 ms too early compared to the signal I know that 
>it's better to check every wav file (that's what I'm going to do), 
>but such a delay make me wonder if  both objects of the slide are 
>starting at the same time on the second computer. Or if there 
>wouldn't be a kind a "wake up" time for the SlideSoundIn?
>
>Sylvain
>
>
>On Thursday, April 30, 2009 11:17:38 PM UTC+2, David McFarlane wrote:
>First, you will need EP2 to record audio at all.  Next, what if you
>used any ordinary stim/response object to wait for and capture the
>onset of vocalization via, e.g., a SRBox, and follow that with a
>SoundIn object that will then record the remainder of the
>response?  You might even split a single microphone between the SRBox
>(for vocalization onset) and the mic input of the computer sound card
>(for recording SoundIn).  I will be interested to learn how this works out.
>
>-- David McFarlane, Professional Faultfinder
>
> >If I want to record the timing of the onset of a vocalization but I
> >also want an auditory recording of the verbal response is there any
> >combination of e-prime software/hardware that can do this? In looking
> >over the response box features, I found that it will time the onset of
> >a vocalization but seems like you need a seperate recording system to
> >capture the actual verbatim response. Can you pair the e-prime
> >software and the response box in anyway to capture both at the same
> >time?
> >
> >I hope this makes sense :)
> >
> >Thanks!

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