On 12/08/2015 09:07 PM, Peter Lennox wrote:
no -percedence effects include a range of phenomena. But precedence
in the median plane isn't quite as effective as in the azimuthal
plane, according to Litovsky, Rakerd, Hartmann et al, but is still
quite effective and so not negligible. So I'd like to understand what
Lee (Huddersfield) was saying, to compare.
i've attached the paper, since it is open access.
i guess i misrepresented it a bit, because i was being sloppy about
distinguishing between precedence effect and summing localisation.
however, wallis and lee conclude:
"Additionally, no evidence could be found to support
the operation of the precedence effect in median plane
stereophony. In the present study the only occasions
whereby stimuli were localized at the position of the ear-
lier emitting loudspeaker were due to the pitch height ef-
fect. There was also no consistent effect of time panning
observed, with localization judgments for the broadband
source becoming more biased towards the upper loud-
speaker as ICTD increased, as opposed to the lower."
[the upper speaker was always lagging behind the lower in this experiment.]
in comparing the results with litovsky et al, it should be pointed out
that while both were conducted under anechoic conditions, the stimuli
used by wallis and lee were long noise snippets with 1s fade-ins and
fade-outs rather than clicks, with no transient information at all
(which seem designed to test the presence of summing localisation), so i
guess they are not in direct contradiction.
it just shows that the musical reality will be somewhere in between...
Certainly, in respect of producing phantom imagery in the vertical,
I've found this to be quite effective (though often slightly more
vague than in horizontal) which would explain why periphonic
ambisonics works at all - and this seems to be a related issue to the
precedence one
i found that vbap/stereophonic vertical localisation is excellent on
speaker positions (because it gets the spectral cues right), and
unusable anywhere else.
3rd-order ambisonic vertical localisation seems uniformly so-so
throughout the elevation range, which to me is preferrable...
--
Jörn Nettingsmeier
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Meister für Veranstaltungstechnik (Bühne/Studio)
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