Stereo to 4 speakers: You can’t map stereo to positions which are out
of the stereo front.
Octomic to 20 speakers: Should actually (and does) work, via simple panning.
It is important to see that every position is panned to 2 speakers in
2D, and (usually) 3 speakers in 3D.
(If speakers should stay empty I don’t see any problem.)
“one channel over several speakers sounds crap”
We are following normal panning rules, which are proven in millions of
recordings. So I would say your statement is just wrong.
You don’t spread “8 speakers over 20 speakers” in some statistical
ways, if that is what you meant.
So I just have suggested to “try” VBAP, obtaining some very reasonable
(and proven) results.
Object and speaker panning is not very different, by the way.
(You can see the speakers also as objects. )
Best,
Stefan
----- Mensagem de Augustine Leudar <augustineleu...@gmail.com> ---------
Data: Fri, 23 Oct 2020 23:21:50 +0100
De: Augustine Leudar <augustineleu...@gmail.com>
Assunto: Re: [Sursound] Recorder for ORTF-3D OUTDOOR SET
Para: Surround Sound discussion group <sursound@music.vt.edu>
I refer to mapping, for example, a stereo file to 4 speakers, an octophonic
to 20 speakers etc - one channel over several speakers sounds crap - so,
for example, the bird that should be a point source coming out of one
speaker is now coming of three menaing th ebird i s no longer a point
source etc etc - the same goes for panning so yes horribly blurred - Im not
talking about objects
On Fri, 23 Oct 2020 at 13:44, Stefan Schreiber <st...@mail.telepac.pt>
wrote:
You < can > remap stereophonic recordings, via simple panning.
Are audio objects “horribly blurred” if you render them? Don’t think
so... ;-)
Best,
Stefan
----- Mensagem de Augustine Leudar <augustineleu...@gmail.com> ---------
Data: Fri, 23 Oct 2020 12:33:34 +0100
De: Augustine Leudar <augustineleu...@gmail.com>
Assunto: Re: [Sursound] Recorder for ORTF-3D OUTDOOR SET
Para: Surround Sound discussion group <sursound@music.vt.edu>
> you can also get reasonably nice downmixes to quad and stereo by
combining
> channels as well . However, the problem with Scheops type systemsI see is
> upmixing rather than downmixing. YOur basically spreadinge signal over
> several speakers when you do that which blurs localisation horrible- and
> this is where ambisonics should, theoretically, have an advantage.
>
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> On Thu, 22 Oct 2020 at 16:32, Fons Adriaensen <f...@linuxaudio.org>
wrote:
>
>> On Thu, Oct 22, 2020 at 12:36:38PM +0100, jack reynolds wrote:
>>
>> > The only problem with using ambisonics mics is the high frequency
limit
>> > above which they stop working properly. A second order ambi mic
reduces
>> > this problem, but above about 7Khz the not quite coincident capsules
>> > becomes a problem.
>>
>> First order responses from an OctoMic are near perfect up to 11 kHz or
so,
>> and not perfect but still very usable even at 15 kHz. I doubt very much
>> if there is any 'real' cardioid' doing better at that frequency and
above.
>> Certainly not if you take diffraction / reflection from the mic body and
>> clamp into account.
>>
>> Anyway, have you ever considered the sort of frequency and polar
response
>> you get by combining signals from capsules spaced more than 10 cm apart
?
>> You'll find they look quite horrible if you care to compute or measure
>> them.
>>
>> You could of course object that those should never be combined, just
each
>> one sent to its own speaker. But that would mean that such a one to one
>> mapping is the only possible way to use such signals if you want to
>> preserve
>> sound quality. No downmixing or anything similar (e.g. binaural)
allowed.
>>
>> But we all know that this is not true, we all have heard very nice music
>> recordings done with spaced mics. Even those in theory horrible
frequency
>> or polar responses resulting from spaced mics can sound quite well. Wich
>> in turn means that this whole 'imperfect polar responses' debate is
mostly
>> academic if not irrelevant.
>>
>>
>> Ciao,
>>
>> --
>> FA
>>
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>
> --
> Artist website: www.augustineleudar.com
> Business website: www.magikdoor.net
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