and to add to this, I can say that Jorn's examples in the SPIRAL were the first one to really convince me of the value of ambisonics... I always had bad decoders and/or low order experiences, and there was some clever filter design in a 3rd order setting... fantastic! p
Le 2011-03-24 à 18:40, Jörn Nettingsmeier a écrit : > On 03/24/2011 04:15 PM, david monacchi wrote: >> Dear all, >> >> we're planning to build in Pesaro-Italy a small ambisonic studio with >> 13 loudspeakers (full 3D - 4@-45°, 4@0°, 4@+45°, 1@90°).. > > knowing your field-recording work, i can see how you'd focus on first order, > but i can't help noticing how 12 speakers would make a lovely second-order > dodecahedron (with a bit of wasted floor space, obviously), which would also > be nice for plain old first order. and it could be simplified to "triangle, > hexagon, triangle", which would also be a far superiour horizontal-only setup > for first order than your square. > > > We're now >> in the process of moving walls, treating acoustically the room, etc.. >> The room will be 5.00 x 4.60 x 3.20h and we are planning to treat it >> to be as more 'dead' as possible.. > > i've had the pleasure to work in two rather dead ambisonic studios, one was > the IEM cube in graz, and the other the SPIRAL at the university of > huddersfield. > dead acoustics are great in that you can get very convincing renderings of > semi-anechoic or free-field conditions. but it can be a bit tricky to keep > phasing artefacts under control, because there are no early reflections to > mask and average them out. > the cube is particularly fussy in this respect (which is probably why the > graz folks report a strong preference for non-delay-compensated decoders in > some of their listening tests). the spiral was totally unproblematic for some > reason: it's three stacked octagons plus zenith (i used a 3h2v decoder > designed by fons), and there was no phasing whatsoever, even though the room > has an rt60 of 0.3s and is so quiet that you begin to notice the hiss of the > genelec 8240s (which are pretty quiet to begin with). > > but phasing can usually be fixed by hand-tuning the delays a bit. > >> In order to have a 'pleasant' space, we're thinking to put a wodden >> floor which, to a certain degree, will also help absorbing some low >> frequencies.. >> >> My question is: considering that the room will be semi-anechoic, is >> the reflection from the wodden floor really compromizing for the >> correct soundfied reconstruction? Are there studies that you know >> with experimental data, or simply your direct experience on this? > > it will have some impact on the rendering, but i doubt it will be > distracting, unless you wanted to specifically reproduce vertigo-inducing > audio scenes with no floor, like dangling off a crane or something. > i'd say as long as your recording has floor reflections, the added ones won't > hurt. > > > 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 _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
