Barring that, or someone from Ircam confirming the implementation, a blinded listening test perhaps. two separate identically configured instances with the same input would need to generate the same output). It could be tested if SPAT passes the null test (i.e. Is SPAT implemented this way, such that the reverb function is distributive? I don't know, but it isn't necessarily the case.
No?Īnd since SPAT is not simply something which you add to a source (like you would a traditional reverb), but actually emulates the phenomenon which occurs when a source generates sounds in a space, I'm inclined to think that there is also going to be a big difference between sending 8 different sources into SPAT all at the same time, on the one hand, or processing them all individually, on the other.I do agree that in the real world separate sound sources would have some interaction and would be more than the sum of their parts. Piet De Ridder wrote: Jason, I would think there'd be a substantial difference between a room responding to 8 different instruments simultaneously, or that same responding to all these instruments separately and then summing the results. It seems like it should be a basic feature of every DAW.
It's unfortunate you would have to go through such rigmarole to send multiple sources to SPAT. I didn't try this with SPAT and my demo has now expired, but if it passes a null test we could learn whether multiple sources do interact within the same instance. I tried to determine this for EAReverb2 but it doesn't pass a null test which would be a prerequisite to do a black box test for this behavior (clearly there is some randomness in the reverb function). And SPAT can do that with up to 8 sources.Are you sure it works this way? Our intuition about the physical world suggests it should be so but there's every possibilty that given the reverb function f, f(a+b) = f(a) + f(b). It'll also respond differently to the combination bass+flute. That's fundamentally different from giving each source its own SPAT treatment.Ī room responds differently to a bass than it does to a flute. But bringing up to eight sources into one single SPAT-space and having these sources, all of them together, influence the room response for the whole group.
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