AFMG Network Forum

Kev Luckhurst · Member

Hello,

I am trying to Auralise and obtain STI predictions for a large venue in AURA. I am doing this to make a comparisson with the actual measured results achieved with EASERA and STIPA tests in the venue.

The Venue has 34 speakers and is very large (1,163,644m3) with 282 faces.

When I try to produce and AURA response at 1 listener seat, i get the following error:

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This calculation required the following free memory:

RAM Size of Response: 422.3 MB
Needed RAM Overall: 1055.7 MB
Hard Disk Space: 1266.8 MB

Please note that the RAM needed for the response calculation exceeds 100 MB.
It is not recommendable to proceed with these settings.
Please reduce the number of loudspeakers, the density factor or the time length.
==================================

But there is no option to proceed with mapping at all, it just gives you an OK button.

My Settings are:

Particles : Low Resolution, Fast 613000
Length (ms) 6120
No Multi Threading
Max Diameter after 1s 2
Density Factor 10

I need to use all of the loudspeakers as that is how my measured results were achieved in the venue.

I also need high density factor, as i need a good freq response and good sounding auralisation.

I need a sufficiently long time length as the RT of the venue is around 5s

Is there a way of removing this 100 MB RAM limit so that I can proceed with this Auralisation ??

100 MB RAM seems extremely low, especially when my PC has 4000 MB RAM to use.

Any help on this is very much appreciated, thanks
Kev

Bruce · Member

Hello Kev,

Unfortunately this limit is caused by the programming environment that is used for EASE 4.x. 100 MB is an empirically found limit that we have when allocating arrays of UDTs in the recombination and in Probe.

The Density Factor is not so important for a good sounding Auralisation. It is more important to have a higher Order which then gives more early cues in the Impulse Response. So I would first reduce this in your case.

Although I have never tried this, I would expect that given the size of the space, well over half, maybe 2/3rds of the loudspeakers are contributing only to the late part of the IR. That would suggest to me that I would try to do the IR in 2 or more passes, then mix them together using the EARS Convolve and Mix tool. I would make sure the close loudspeakers to the Listener Seat are done with a high order and would do the others with a smaller order.

Kev Luckhurst · Member

Thanks for the reply Bruce, i might give that go.

Cheers!
k