Samples per second

[David McFarlane]

Michiel, Doug,

Hmm, my advice has always gone in the other 
direction, never use any more resources than you 
really have reason to use.  E.g., if the 
experiment only uses a monophonic 1 kHz tone, 
then why sample at 44.1 kHZ stereo when 11 kHz 
mono will work just as well (and probably at 8 
bit resolution to boot).  I would be interested in others' comments.

But on to Doug's question.  First, as Michiel 
says, you cannot change audio parameters within 
an experiment, so all your sound files must use 
the same parameters.  Next, you must set the 
properties of the Sound Device object to match 
the properties of your sound files (Edit > 
Experiment > Sound).  You will see entries for 
Channel, Samples, and Bits Per Sample.  The 
default (at least for my EP 1.2.1.841) is 2 
Channels (i.e., stereo), 22050 Samples (per 
second), 16 Bits Per Sample, so if you just make 
your files to those parameters then you don't 
have to make any changes in your E-Prime 
experiment, otherwise adjust E-Prime here to match your sound files.

---
David McFarlane, Systems Designer
Dept. Psychology, Michigan State University
mcfarla9 at msu.edu    www.msu.edu/~mcfarla9
Voice: (517) 353-0799    Fax: (517) 353-1652


At 1/29/2008 04:02 AM Tuesday, Michiel M. Spapé wrote:
>Hello Doug,
>
>The sample-rate can be compared to the 
>resolution of image files (but temporally, so 
>not quite the same thing). If you want to be on 
>the safe side, use the highest resolution 
>available, 44.1 khz, which is the same as cd 
>audio quality. I'd recommend never using 
>anything lower than that, and preferably not 
>upsampling to this samplerate but instead just 
>recording at this, or higher, rate. E-Prime can 
>only go to 44.1 khz, stereo files, set in the 
>properties of the audio device (edit > 
>experiment), and to my knowledge not 'switch' 
>between samplerates (not that it is part of your 
>question, but should you be wondering about it).
>
>Cheers,
>
>Michiel M. Spapé
>Leiden Institute for Brain and Cognition and 
>Leiden Institute for Psychological Research
>
>________________________________
>
>Van: e-prime at googlegroups.com namens DG
>Verzonden: di 29-1-2008 4:45
>Aan: E-Prime
>Onderwerp: Samples per second
>
>
>Hi,
>
>We're trying to play a sound file as auditory stimulus, but are
>getting an error at runtime which indicates that we're using an
>incorrect sampling rate for the WAV file.  How many samples per second
>should we be using for E-Prime version 1.2.1.844?  I can just resample
>the file accordingly.
>
>Thanks,
>Doug


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