Re: AUDITORY Digest - 28 Aug 2002 to 29 Aug 2002 (#2002-139)

[Susanne Sterbing <sterbing@xxxxxxxxxxxxxxx>]

hamish,

1. There is no such thing like a "typical HRTF".
2. If head-size were the problem we could use Manikin-
HRTFs for virtual auditory environments. But this is not
the case, because the pinna shape is much more important.
3. Especially front localization is critical in a virtual auditory
environment if non-individual HRTFs are used: you
would end up with front/back confusions and an elevated
percept for frontal positions.

My recommendation would be either to use three loudspeakers
(individually equalized)and do the experiment in an anechoic
environment, or use individual HRTFs (it is not time-consuming
to measure three positions).

Dr. S. J. Sterbing
Univ. of Connecticut Health Ctr.
Dept. of Neuroscience
263 Farmington Ave
Farmington CT 06030
Email <sterbing@neuron.uchc.edu>



___________________________________________________________
> I'm a PhD student at the Brain Sciences Institute in Melbourne, about to
> embark on my first experiment looking at cross-modal attention affects on
> event-related brain potentials.  I'm planning on using simulated "spatial"
> stimuli in one of my tasks.  I have some flashing lights located on the
> left, right and center in front of a subject.  There are some beeps that
I'd
> like to play thrpough headphones AS IF they were coming from the location
of
> the flashing lights.
>
> They don't have to be exactly localised at the location of the lights, but
I
> would like them to be vaugely from the same area.  What I'm looking for is
a
> way of "spatialising" my (already made up) sound stimuli.  I'm aware that
> the HRTF for each person is different, but am think that perhaps i could
use
> a small set of typical HRTF's that would cover "large-headed",
> "small-headed" etc people.
>
> What I was wondering was
>
> 1) is this a good idea
> 2) where should i start looking for ways of actually implementing this?
>
> I have a passing familiarity with MatLab etc
>
>
> many thanks for any pointers in the right direction!
>
> -hamish-
>
> ------------------------------
>
> End of AUDITORY Digest - 28 Aug 2002 to 29 Aug 2002 (#2002-139)
> ***************************************************************