hi *!
if i were to use a dual-band (aka shelf-filtered) third-order octagonal decoder with line arrays instead of point sources, are there any optimisations that should be applied to the decoding matrix? i guess there will be some error in the W component, at least in the hi-mid band where the line array emits something close to a cylindrical wave.
my conjecture is that line arrays will let you create larger setups, since they suffer from less level drop across the diameter of the listening area, thus you can get further away from a source before the auditory event collapses into the opposite speaker. as mentioned before, we have run some tests with such a rig last year, the results have been very promising, and i'm currently writing it up. numbers show it shouldn't work, but it does.
can anyone point me to papers that look at phantom imaging in the ambisonic case? the classic two-source experiments dealing with summing localisation and the "law of the first wavefront" seem to suggest that large-scale ambisonics with humongous time errors can't work at all. and the rV/rE metrics seem to focus on the sweet spot, i.e. an area where all speaker signals are coincident. in large-scale systems, this is obviously no longer the case: for an array of 20m diameter, not only are the speaker signals outside the summing localisation window of <1ms, they even begin to move out of the "haas window" of 30ms, where distinct echoes should become audible...
best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
