Auditory Recording and Onset timing

Thu Sep 4 20:02:43 UTC 2014

Stuart,

First, to update this thread a little, various sites (including PST) 
have tried to split one microphone for use for both RT and recording, 
and have not gotten this to work adequately.  So as you have done, it 
is still best to use two separate microphones, one for RT voice key, 
and another for voice recording.

Now, just a couple of thoughts offhand, I have not tested this (I 
will leave that to you :) ) ...

First, are you sure that ending the trial after the vocal trigger 
also stops the sound recording?  Back when I tested sound recording 
(using EP2.0.8.90), I found that sound recordings always went on for 
the full duration of Buffer Size, regardless of anything else that 
happened.  Did I miss something?  If you find different behavior, 
perhaps you could make a minimal example program and send that to me 
(off the list).

Even so, I imagine that you still want E-Prime to hold up for a set 
time after each vocal RT and then move on.  In that case, and 
assuming that recording does continue after termination of the Slide 
or SoundIn object, what about just using a Wait object after your 
stimulus object.  E.g.,

     - TrialProc
         - FixText
         - StimSlide  ' includes SlideSoundIn for recording, and terminates
                      ' upon vocal RT
         - RecordingWait  ' extra time to wait after StimSlide terminates
         - TrialEndText

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

/----
Stock reminder:  1) I do not work for PST.  2) You may reach PST's 
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\----

At 9/4/2014 10:31 AM Thursday, Stuart Quirk wrote:
>Thanks David for the many helpful posts I have read from you and 
>others on this group. Very kind of you and others to lend your expertise!
>
>I have a question related to this topic--
>I have separate mics for SRBOX (for RT data collection) and for line 
>in recording of actual answers (for offline accuracy coding).
>
>My question is: Is there a way to set up my trials so that the RT 
>trigger ends the trial *after* a delay (long enough to capture the 
>vocal answers)?
>That is, ending the trial after the vocal trigger would obviously 
>stop the inline recording as well.
>I have currently fixed the duration of each trial and simply log the RT.
>This works fine but if I could link trial length to RT (plus 300msec 
>or so) I could shave a lot of time off my overall study.
>
>thanks!
>Stuart Quirk
>
>On Monday, March 4, 2013 4:32:04 PM UTC-5, McFarlane, David wrote:
>Relevant to this 
>issue: 
><http://docs.psychtoolbox.org/InitializePsychSound>http://docs.psychtoolbox.org/InitializePsychSound 
>.
>
>-- David McFarlane
>
>
>At 3/4/2013 02:31 PM Monday, David McFarlane wrote:
> >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>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>http://suppo 
> rt.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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