Auditory Recording and Onset timing

[David McFarlane]

Relevant to this issue:  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 ).
>
>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!
>
>--
>You received this message because you are subscribed to the Google 
>Groups "E-Prime" group.
>To unsubscribe from this group and stop receiving emails from it, 
>send an email to e-prime+unsubscribe at googlegroups.com.
>To post to this group, send email to e-prime at googlegroups.com.
>For more options, visit https://groups.google.com/groups/opt_out.
>

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To unsubscribe from this group and stop receiving emails from it, send an email to e-prime+unsubscribe at googlegroups.com.
To post to this group, send email to e-prime at googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.