Re: Multichannel Sound

[Peter Lennox <peter@xxxxxxxxxxxxxxxxxxxxxxxx>]

What kind of material? - most multichannel formats will incorporate some
kinds of panning laws (not always specified) to produce phantom imaging. So
they won't have discrete sources in them (any more than stereo does) -
therefore, the space/localisation cues you might be looking for are rather
at the mercy of the technical decisions used to 'spatialise'.
You could ask on the "sursound" list, where there are many researchers
involved in surround-sound, which is the nearest thing anyone has to "3-d
sound".
Possibly some kind of transaural technology (X-talk cancelling) would give
the most precise control over 180-degrees, horizontally (but not
verticallly).
There's only really ambisonics that attempts 360 degrees with vertical
dimensions as well, but in this case you also need the speaker-array decode
technology as well. I'd recommend 2nd order in this case.
In any event, no technologies have precise control over 'distance' cues, not
surprisingly, so you can only really extract direction/localisation cues.
Hope this helps
regards
ppl
----- Original Message -----
From: "D. Sen" <dsen@IEEE.ORG>
To: <AUDITORY@LISTS.MCGILL.CA>
Sent: 03 June 2003 21:38
Subject: Re: Multichannel Sound


> While we are on the topic of sound files... Can anyone suggest where I
> can find multi-channel sound files ("multi" being greater than two
> (stereo))? I would like to use them to extract space/localisation cues.
>
> Thanks,
> DS
>
> Brian Gygi wrote:
> > At 08:32 AM 6/3/2003 +0200, Ladislava Janku wrote:
> >
> >> Dear all,
> >>
> >> I am interested in auditory scene analysis and I am looking for some
> >> free accessible databases of environmental sounds (wind, ocean, birds,
> >> traffic, cars, trains, airplanes, applaus, etc.) . Does anobody know
> >> where is poossible to obtain such data?
> >>
> >> Tnaks for your advice.
> >>
> >>
> >> Ladislava Janku
> >>
> >> ----------------------------------------------------------
> >> Research Scientist
> >> Czech Technical University in Prague
> >> Faculty of Electrical Engineering
> >> The Dept. of Cybernetics
> >> Centre of Excellence MIRACLE
> >> Technicka 2
> >> 16627
> >
> >
> > If you do a google search on 'free sounds effects' you will find a lot
> > links.  A lot of companies that sell sound effects CDs offer free ones
> > on the Net.  The quality is variable, but there are some ones that are
> > usable for research.  One good site is
> > http://www.a1freesoundeffects.com/
> >
> > A page with a lot of links to free sound effects libraries is http
> > <http://www.stonewashed.net/sfx.html>://www.stonewashed.net/sfx.html
> > <http://www.stonewashed.net/sfx.html>
> >
> > http://www.findsounds.com/ will let you search for a particular sound,
> > specifying sampling rate and file type
> >
> > Cornell University has a library of natural sounds,
> > http://www.birds.cornell.edu/lns/
> >
> > I hope these help
>
> --
> D. Sen,
> http://www.auditorymodels.org/~dsen
>
>