This second order microphone will not be expensive. It is only eight channels 
rather than nine, but I believe this is an acceptable compromise. I will use 
the Zoom F8 to record. I am visiting Parma because Angelo intends developing a 
calibration system which will output nine channels after processing.

You can imagine a tetrahedron surrounded (on the horizontal plane) by four 
capsules at 0, 90,180 and 270 degrees. That is basically the array design. I 
believe the sphear design is different.

umashankar

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Stefan Schreiber<mailto:st...@mail.telepac.pt>
Sent: Monday, May 8, 2017 7:15 PM
To: Surround Sound discussion group<mailto:sursound@music.vt.edu>
Subject: Re: [Sursound] brahma revived

umashankar manthravadi wrote:

>I forgot to mention I will carry a second order microphone to Parma where I am 
>visiting Angelo Farina and his department from June 19 to 21st.
>
>umashankar
>
>

Very interesting for VR audio capture - but I suppose they/we would need
way more information. (Even some basic info seems to miss.)

There is currently no "native" HOA mike available - with the exception
of the (expensive) eigenmike.


umash
https://ccrma.stanford.edu/~nando/publications/sphear.pdf

Is this related somehow?  (At least in some "same field" sense I guess...)

Best,

Stefan




>Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
>From: umashankar manthravadi<mailto:umasha...@hotmail.com>
>Sent: Monday, May 8, 2017 7:25 AM
>To: sursound@music.vt.edu<mailto:sursound@music.vt.edu>
>Subject: [Sursound] brahma revived
>
>After a six month hiatus, I am restarting the manufacture of Brahma 
>microphones. The first is Brahma-in-zoom. I should have a few ready, but 
>generally I will make on order, Later this year, I will build redesigned 
>standalone Brahma microphones, including second order microphones. I plan to 
>keep things simple; money through bank transfer or paypal, and a web page with 
>photographs and details of the new designs.
>
>umashankar
>
>Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
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