Hi Aaron - which is exactly what Ill be doing over the next few weeks ! Ill
be using a program called Holm Impusle - We've already measured the
frequency response of the capsules individually - next we are going to
measure the finished array with the capsules in sitiu. We have filled the
space in between the capsules to try and reduce reonance/reflections. We
may also attempt to callibrate the "timing "of each capsule in the same way
we have with the gain as well as trying to offset the tiny time of arrival
difference caused by the fact we are using two capsules to create a figure
of 8 rather than one ribbon mic -  the initial test show the frequency
response is pretty similar between the capsules though there was a greater
degree of variance with the gains (the gains differences are compensated
for in the software already) , as you say once in the chasis the
reflections and resonance of the casing may change that. Ill post results
when they're done. Initial results with the microphone are pretty good
actually - but theres lots of tweaking to be done....

cheers,
Gus

On 29 May 2012 04:57, Aaron Heller <hel...@ai.sri.com> wrote:

> I've simulated the diffuse field response for the Velan design using
> the A-to-B matrix I gave earlier.  The analysis and graph are at
>
>  http://www.ai.sri.com/ajh/ambisonics/velan_sim_dfr.html
>
> Note that in practice these simulations are only a starting point for
> EQ.  Real capsules deviate significantly from the idealized math
> models used here.  In addition, the capsules shadow each other and the
> space in the middle acts as a resonant cavity.  So you really have to
> measure the finished array and then design the EQ.
>
> --
> Aaron Heller (hel...@ai.sri.com)
> Menlo Park, CA  US
>
>
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