On 10/16/2012 12:31 AM, Fons Adriaensen wrote:
On Mon, Oct 15, 2012 at 10:33:09PM +0200, Jörn Nettingsmeier wrote:
regardless of whether you consider a two-source phantom spectrum
good or bad, i guess we can agree a three-source one is waaaay
worse?
No. Why should that be ?
Theile always repeats that we can handle two correlated sources
but not more. But I've never seen any convincing argument for
that. And when I asked him he evaded to discuss the matter.
well, for me, a two-source frontal phantom image is _almost_ free of
coloration, even when i move, at least to the point where i'd say it
doesn't bother me at all.
when i obstruct one ear (or, to some lesser degree), if i turn sideways
so that the stereo speakers are lateral, any little motion will result
in drastic changes of tone color.
this is the problem with ambisonic systems which have too many
speakers for their own good - more speakers makes for more
crosstalk.
There are other reasons for that. They could be expressed in
terms of interference patterns if you really want, but that
would be sort of missing the point, like trying to understand
the beauty of a piece of music by looking at the waveform.
why? i'm pretty sure it is precisely this regular and sharply defined
interference pattern. the problem is less apparent in spaces with strong
early reflections.
i'm not really thinking about localisation and rE here, just about tone
color (and the phasey feeling you get when you move through a
reconstructed sound field with a tight HF interference pattern).
it would be very interesting to simulate and measure those interference
patterns and their impact on listeners, over ten octaves! usually, what
we get to see are plots at a single frequency (the irregularities
outside the strict sweet spot are obviously quite drastic). the question
is what the brain can do with a sound field where each frequency band is
highly irregular across the listening area, but all bands are wrong in
different ways. once we have a working hypothesis, i wouldn't be
surprised if particular interference patterns are demonstrably better
than others, even for different individuals. there is a lot of ambisonic
lore about favourite configurations, but afaik it hasn't been dealt with
in any systematic way.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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