[microsound] video and surround

[Davide Oliveri]

Thank you Trond !
Your informations and opinions are helpful me to write about this subject.
I didn't know about Natasha Barret, she seems to work very hard with
spatialization.

I like the idea of layering loudspeakers to treat the sound like an image,
in the Elektropoesia  but i preferred Staged Bodies.
You said you used Max, may I know if it's with Ambiencode/decode that you
generated sound ?


Davide Oliveri


2010/12/7 Trond Lossius <trond.lossius at bek.no>

> Hi,
>
> Bruce Wiggins did a PhD some years ago working on a method to find optimal
> decoding coefficients for each of the speakers to use when decoding 2nd
> order ambisonics for ITU 5.1. The thesis is available for download, and
> should be easy to google for.
>
> The SoundField SPS200 microphone is doing ambisonics recordings, and the
> accompanying VST and AU plugins are able to decode for a number of formats,
> including 5.1. I've tested it a bit at the studio at BEK, and it works, but
> my initial impression is that the sound image is fairly unstable once you
> move outside of the sweet spot. If you were to use video with ambisonics
> decoded for 5.1 in e.g. a video screening program, I would test this
> thoroughly in order to have a better idea of how/to what degree it's
> working. One option might be to use this to create a surrounding backdrop,
> and then position additional sources using standard DAW surround panning
> techniques on top of it for more exact locations.
>
> I have listend to some of the 6 channel sounds that comes with
> Logic/SoundTrack/FinalCut that can be used as ambiences in sound design, and
> it strikes me that they are pulling lots of tricks to make it sound the
> best. E.g. there is one or more sound recordings "at the bay", with the
> sound of waves breaking as they hit the quay. This sound actually seems to
> be made up from 5 totally independent mono channel signals. The result is
> that water seems to be splashing at all sides, but if you listen more
> carefully it is actually only splashing at the locations of the speakers.
>
> I have used ambisonics in combination with video and other media in several
> of my installations, e.g. Stages Bodies:
>
> http://trondlossius.no/works/29-staged-bodies-2005-06-
>
> Here video was rendered in real time using max/Jitter/OpenGL using two
> projectors. Likewise sound was generated in realtime using Max, and played
> back using 9 loudspeakers in a kind of horse show formation.
>
> Another example is Elektropoesia from 2004 in collaboration with Kurt
> Ralske. Again a wide panoramic video image, and this time 16 loudspeakers on
> a line just below the video:
>
> http://trondlossius.no/works/17-elektropoesia-2004
>
> One of the limitations (for me) of ambisonics in installations is that it
> is pretty strict about loudspeaker positioning if it is to work optimal.
> That might not always be straight forward to combine with how I want or am
> able to position the speakers in an installation context. So, often I
> instead end up breaking the rules, but still getting some interesting
> spatial results. On the other hand Natasha Barrett has found ways of using
> ambisonics in installations that has used it very efficient.
>
> Cheers,
> Trond
>
>
> On Dec 7, 2010, at 10:46 AM, Davide Oliveri wrote:
>
> > Hello and many thanks for sharing and speaking about your opinion.
> >
> > Did you record ambisonic sound or it's a matter of editing ? And what did
> you use to edit ?
> >
> > I tried to do something in UHJ about one year ago and I used Max/Msp
> externals Ambiencode/Ambidecode,
> > but I didn't like the result because I wanted to achieve the effect of
> "flying" sound over the head
> > and I guess it's not so easy to do with just two channels...
> >
> > You can listen an excerpt of the result here.
> >
> > So one can use ambisonic in surround system and get a better surround
> effect, it sounds interesting.
> > I wonder if ambisonc is actually used in newest sourround productions.
> >
> > Don't you think that surround could be an "invasion" of the space of the
> (film/video) audience ?
> > I mean, we see something "over there" but we hear something "here".
> >
> > However i didn't find the sound of "the adder's bite" so present to be
> considered "here" and i think it's a good thing.
> > By the way, what is the best configuration for the speakers to liste the
> UHJ format, in front or at side ?
> >
> >
> > Davide Oliveri
> >
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