There are 2 messages totalling 558 lines in this issue.
Topics of the day:
1. ICAD2008 / 2nd CALL FOR *DEMOS*
2. HRTF: azimuth to ITD
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Date: Mon, 18 Feb 2008 10:53:04 +0100
Subject: ICAD2008 / 2nd CALL FOR *DEMOS*
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ICAD2008
--------------
2nd CALL FOR DEMOS / June 24-27, 2008
The 14th International Conference on Auditory Display (ICAD)
IRCAM, Paris, France
June 24-27, 2008
IMPORTANT DATES
Demo proposal received by:
10th of March 2008
----------------------------
ICAD DEMOS
ICAD 2008 will take place from the 24th to 27th, between the Agora IRCAM's
festival (June 5-20) and Acoustics 08 (June 29 - July 4)
IRCAM, Institut de Recherche et Coordination Acoustique/Musique, is pleased
to host the 14th annual International Conference on Auditory Display (ICAD).
This conference will address concepts, methods and tools of sound production
involved in the process of "designing sounds" in an interactive context.
Beside topics traditionally addressed by ICAD (auditory warning, 3D audio
display, etc. ) we would like to take the opportunity of ICAD being held at
IRCAM to highlight the relation between research in auditory perception,
computer music and sound design in order to contribute to a global framework
of computer aided sound design.
In the hopes of enhancing the quality and quantity of demonstrations at
ICAD'08, a demo session has been created. Demonstrations can be technical or
artistic in nature. This session will be structured as a short paper
session. Submissions of 1 page shall be made, which present the concept of
the work as well as any technical requirements. For this session, the
conference room will be equipped with an 8 channel RME Firewire audio card
and 8 loudspeakers. Any specific layout or additional material, even if
supplied by the presenter, must be specified at the time of submission in
order to check practical feasibility and compatibility with the room
infrastructure.
Demonstrations will have a 15 minute slot, plus a 5 minute setup time. Time
limits will be strictly adhered to, without exception. Final submitted short
papers should not exceed 2 pages.
**** Please excuse multiple postings ****
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<div class=3DSection1>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'>---------=
-----</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>ICAD2008</=
span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'>---------=
-----</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>2nd
CALL FOR DEMOS / June 24-27, 2008</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>The
14th International Conference on Auditory Display =
(ICAD)</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>IRCAM,
Paris, France</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>June
24-27, 2008</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:#001FE2'><a =
o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>IMPORTANT
DATES</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal>Demo proposal received by:<o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:13.0pt;font-family:"Helvetica","sans-serif";
color:red'>10th of March 2008</span><span =
style=3D'font-size:20.0pt;color:red'><o:p></o:p></span></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3DMsoNormal><span class=3Dapple-style-span><span =
style=3D'font-size:9.0pt;
font-family:"Helvetica","sans-serif"'>----------------------------</span>=
</span><span
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p></o:=
p></span></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>ICAD
DEMOS</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>ICAD
2008 will take place from the 24th to 27th, between the Agora IRCAM's =
festival
(June 5-20) and Acoustics 08 (June 29 – July =
4)</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'>IRCAM, Institut de Recherche et Coordination =
Acoustique/Musique,
is pleased to host the 14th annual International Conference on Auditory =
Display
(ICAD). This conference will address concepts, methods and tools of =
sound
production involved in the process of “designing sounds” in =
an interactive
context. Beside topics traditionally addressed by ICAD (auditory =
warning, 3D
audio display, etc. ) we would like to take the opportunity of ICAD =
being held
at IRCAM to highlight the relation between research in auditory =
perception,
computer music and sound design in order to contribute to a global =
framework of
computer aided sound design.</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=3DMsoNormal><span class=3Dapple-style-span><span =
style=3D'font-size:9.0pt;
font-family:"Helvetica","sans-serif"'>In the hopes of enhancing the =
quality and
quantity of demonstrations at ICAD'08, a demo session has been created.
Demonstrations can be technical or artistic in nature. This session will =
be
structured as a short paper session. Submissions of 1 page shall be =
made, which
present the concept of the work as well as any technical requirements. =
For this
session, the conference room will be equipped with an 8 channel RME =
Firewire
audio card and 8 loudspeakers. Any specific layout or additional =
material, even
if supplied by the presenter, must be specified at the time of =
submission in
order to check practical feasibility and compatibility with the room
infrastructure.</span></span><span =
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p></o:=
p></span></p>
</div>
<div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:black'>Demonstrations will have a 15 minute slot, plus a 5 minute =
setup
time. Time limits will be strictly adhered to, without exception. Final
submitted short papers should not exceed 2 pages.</span><span =
style=3D'font-size:
18.0pt;font-family:"Helvetica","sans-serif"'><o:p></o:p></span></p>
</div>
</div>
<div>
<p class=3DMsoNormal><span class=3Dapple-style-span><b><span =
style=3D'font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:black'>for further =
informations see
: <a =
href="" href="http://icad08.ircam.fr/site/?q=3Dnode/20">http://icad08.ircam.fr/site/?q=3Dnode/20">
http://icad08.ircam.fr/=site/?q=3Dnode/20</a></span></b></span><span
style=3D'font-size:18.0pt;font-family:"Helvetica","sans-serif"'><o:p></o:=
p></span></p>
</div>
<div>
<p class=3DMsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=3DMsoNormal><span =
style=3D'font-size:9.0pt;font-family:"Helvetica","sans-serif"'>****
Please excuse multiple postings ****</span><o:p></o:p></p>
</div>
<div>
<p class=3DMsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=3DMsoNormal><o:p> </o:p></p>
</div>
</div>
</body>
</html>
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------------------------------
Date: Mon, 18 Feb 2008 21:13:34 +0100
Subject: Re: HRTF: azimuth to ITD
Dear John,
This is a very important question, and lead to a very fundamental =
question:
what is the ITD? There are a variety of opinions on the matter going =
around,
concerning difference in time of arrival or time delay for the most
coherence between left/right signals. The addition of frequency =
variations
is also an important questions.=20
Can you actually say there is sense in a measure ITD between 2 ears at =
80
Hz? The wavelength a this frequency is enormous, human localization =
ability
being negligible, and finally the majority of HRTF measurement systems =
don't
have decent response at these low frequencies (as well as the rooms
response), so many (like CIPIC) simulate the results.=20
At higher frequencies, the measured ITD values, and contour pattern =
(spatial
function one could say) vary greatly depending on the method used to
calculated the ITD. For example, with the max(ITD) azimuth varying from =
60=B0
on front to 120=B0 to the rear.=20
The problem, as such, is both a signal processing and psycho-acoustic. =
While
many mathematical methods can be derived to calculate a time-difference,
there are in fact very few studies on the correlation between perceived =
ITD
and measured ITD. The few that have been done have focused on the =
frontal
plane, where there are less differences between methods.=20
While I realize that this response doesn't really answer your question, =
I
think it is important to highlight that in fact here is not a real =
consensus
on the issue, even though many take the idea of ITD as a given and =
simple
process.=20
We are currently working on a publication for which much more =
information
will be available shortly. Regrettably, I can not diffuse the results =
before
publication.
Cordially,
-Brian FG Katz=20
---
Brian FG Katz, Ph.D
Perception Situ=E9e
LIMSI-CNRS
BP 133
F91403 Orsay
France
tel. (+33) 01.69.85.81.23
fax. (+33) 01.69.85.80.88
direct.(+33) 06.27.30.67.60
-----------------------------
Date: Thu, 7 Feb 2008 13:24:12 -0500
Subject: HRTF: azimuth to ITD
i am doing some work that involves head-related transfer functions. i =
have
been using the MIT and CIPIC databases and have noticed some unexpected
results regarding interaural time delay. for example, in the case of =
the
MIT database (full,L) at 0 degrees elevation, the time delay associated =
with
the HRTF of 70 degrees azimuth is smaller than that of 65 degrees =
azimuth
for 80-150 Hz. similarly, for 6.5-8 kHz, the time delay for 70 degrees
azimuth is larger than that of 75 degrees azimuth. =20
i have noticed similar trends in the compact MIT database and in the =
CIPIC
database. i can imagine that HRTF measurements taken from humans may =
have
slight discrepancies due to subtle head movements by the subject, but =
can
anyone explain why measurements using KEMAR would have non-monotonic
functions relating azimuth and ITD? does what i'm seeing reflect =
physical
time delay or is it possibly an artifact from the measurement process or
signal processing involved? =20
thanks very much, john
********************************
John Woodruff
Perception and Neurodynamics Lab
Ohio State University
www.cse.ohio-state.edu/~woodrufj
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End of AUDITORY Digest - 16 Feb 2008 to 18 Feb 2008 (#2008-37)
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