[Sursound] Funded PhD Opportunity in Spherical Microphone Array Development

[Bruce Wiggins]

Derby has a number of funded PhD opportunities, one of which  is in
spherical microphone array development.  Details can be found at:

http://jobs.theengineer.co.uk/employer/106091/university-of-derby/

The deadline is 30th June for anyone who's interested ;-)

Many thanks

Bruce Wiggins
University of Derby
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Re: [Sursound] [allowed] Re: Directional confusion between different B-format players

[Gerard Lardner]

Thanks, everybody, for the suggestions. I will follow up on them over 
the next few days. I have downloaded the "Eight positions" off Ambisonia 
and an equivalent file from VVAudio. It may take me until next week to 
find time to check them out as we are rehearsing almost every evening 
this week for another concert at the weekend.


Gerard Lardner


On 14/06/2015 16:04, Michael Chapman wrote:

I have a problem of directional confusion that depends on which B-format
player is used.

Well it could be something subtle ... then again it could be one of those
classic coding errors ... ;-)

Get Aaron Heller's "Eight Positions" off Ambisonia and massage that
through your two bits of software  ?

If you can't get it, I have my own 26-positions (but you shouldn't need
that for a L-<->-R swap problem ... though it will work just as well). I
can send a copy.

If you can eliminate a coding error ... then it gets interesting ...

Michael





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Re: [Sursound] [allowed] Re: Directional confusion between different B-format players

[Gerard Lardner]

That occurred to me too. The Oktava array is really huge (mine is an old 
one; the newer ones may be smaller); it places the capsules on a sphere 
of radius 48 mm - nearly 4" diameter! But the problem, the swapping of 
left and right in the front soundstage, exists only for one decoder (of 
those that I have tried) and only for one virtual mic pattern - VVmic 
decoding B-format to Blumlein stereo pair; it doesn't occur if I use 
Harpex B Player to decode the B-format to the same Blumlein stereo pair. 
That's what is puzzling. If they were swapped in more cases I could 
perhaps understand it better. I was wondering if VVMic and Harpex treat 
the 'back' lobes of the crossed figure-8s differently.


When I have some more time, I will try to record something using both 
the Oktava array and a Brahma Ambisonic mic and to see if there is the 
same difference. The Brahma array is much smaller than the Oktava array.


Gerard Lardner


On 14/06/2015 17:34, Paul Hodges wrote:

--On 13 June 2015 20:15 +0100 Gerard Lardner  wrote:


I recorded a concert using my Oktava MK-012 4D ambisonic microphone
and encoded it to B-format using Brahmavolver. Yesterday, while
playing back the recording with the conductor we noticed that under
certain circumstances left and right appeared to be swapped.

My first thought is that the microphone used has its capsules more
widely spaced than other tetrahedral mics, which could be leading to
some directivity confusion at lower frequencies than usual, which in
turn this material might be sensitive to.  Certainly I've never noticed
such an effect with VVmic, whether using a TetraMic or my previous
native B-format arrangement.

Paul



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