linuxaudio.org

disclaimer: this user is getting seriously confused.
On 02/28/2010 01:56 PM, fons@kokkinizita.net wrote:
> To reproduce the field of a real source, you need *all*

quoted text
> spatial harmonics, in theory (for a real point source)

> up to infinite order. So An AMB system of order N must

> not just recreate the harmonics up to order N, but *all*

> of them. It will control some of them (but no more than

> the number of speakers), and the rest has to be generated

> by aliasing.

i can see how a soundfield mike would capture (and thus include in the

first-order signal)those aliased components, but then what about a

panner? following your argument, shouldn't we add higher-order aliased

components into a panner matrix?
> A first order horizontal decoder with 4 speakers will

quoted text
> exactly control the levels of the 0, 1st and 2nd order

> components, and the rest is filled in by spatial aliasing.

> The aliased components are not exact of course, and that's

> why localisation will be impaired if you move away from

> the sweet spot.

>

> Now if you use e.g. 8 speakers to reproduce horizontal first

> order the system controls components up to 4th order. If the

> input is just first order, the 2nd and 3rd order components

> will be zero, as will be all those that alias from them (5,6,

> 10,11,13,14, etc.) The result is a field that does not match

> well to that of a real source.

hmm. i still don't see from this explanation why 1st order horizontal

sounds worse over 8 speakers (or 12, for the sake of argument) than over

just six, even if i'm in the sweet spot.
best,
jörn
(who is about to crack open a can of fizzy InstaMath(tm) extra-strong)
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