Hi list,

lately, I've been experimenting a lot with hrtfmove(2), which I believe is
one of the most exciting new opcodes. It works fantastically, with one exception:
I can't  position a sound source in front of the listener (i.e. from 270-90
degrees). No matter what I do, I (as well as others)I always perceive it
as coming from behind me. I tried it with various sound sources, but that
does not seem to make a difference. Has anybody else experienced that?

Alex

Sunrise ADSL mit automatischer Installation - die einfachste Art, ins schnelle
Internet einzusteigen. Ab CHF 9.90 pro Monat. http://www.sunrise.ch/adsl

Hi Alex
We expect to actually see a source that is spatialised in front of us, so
often have difficulty when an auditory cue exists without a visual one.
As Victor mentioned, the dataset is not individualised to your ears, which
can also cause problems. As the various folds of the pinnae are important
for front/back localisation, listening through generalised ears can cause
difficulties!
Some suggestions...
Try a noise burst spatialised statically at 0 degree elevation, and changing
from 0, 30, 60 , 90 azimuth etc around the full circle and note the spectral
changes from front to back.
Try a longer, frequency rich source spinning around the listener and again
note the changes.
I find that a simple 0-90 degree azimuth movement works well as an example
with short musical sources.
I can send you some examples if you like.
Brian
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I have noticed the same thing with binaural recordings, recorded with 
mics in my ears. The front sound sometimes sounds like it's coming 
from the back. Since you (Alex) are experiencing the same thing with 
hrtfmove2 this has made me wonder if it's something in the playback 
method rather than the sound file(??). I have not tried any csound 
hrtf opcodes, just noting the similar problem.

--David

At 04:15 AM 5/19/2008, you wrote:

>Hi Alex
>We expect to actually see a source that is spatialised in front of us, so
>often have difficulty when an auditory cue exists without a visual one.
>As Victor mentioned, the dataset is not individualised to your ears, which
>can also cause problems. As the various folds of the pinnae are important
>for front/back localisation, listening through generalised ears can cause
>difficulties!
>Some suggestions...
>Try a noise burst spatialised statically at 0 degree elevation, and changing
>from 0, 30, 60 , 90 azimuth etc around the full circle and note the spectral
>changes from front to back.
>Try a longer, frequency rich source spinning around the listener and again
>note the changes.
>I find that a simple 0-90 degree azimuth movement works well as an example
>with short musical sources.
>I can send you some examples if you like.
>Brian
>--
>View this message in context: 
>http://www.nabble.com/hrtfmove2-tp17307780p17313275.html
>Sent from the Csound - General mailing list archive at Nabble.com.
>
>
>
>Send bugs reports to this list.
>To unsubscribe, send email sympa@lists.bath.ac.uk with body 
>"unsubscribe csound"

David Mooney:  dmooney@city-net.com
Maxine Heller:  mheller@city-net.com
Opaque Melodies:  www.city-net.com/~moko/

These front back confusions are quite common, and are referred to as
'reversals' in the literature.
There are several issues to consider, mainly the non individualised dataset,
but also the lack of a visual cue, the 'cone of confusion', and the lack of
head tracking in headphone playback...
Brian



David Mooney/Maxine Heller wrote:
> 
> I have noticed the same thing with binaural recordings, recorded with 
> mics in my ears. The front sound sometimes sounds like it's coming 
> from the back. Since you (Alex) are experiencing the same thing with 
> hrtfmove2 this has made me wonder if it's something in the playback 
> method rather than the sound file(??). I have not tried any csound 
> hrtf opcodes, just noting the similar problem.
> 
> --David
> 
> 

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