Dave Hunt:
THe Harman mems microphones presumably depend on their size, and
shape, to make them directional. They are not "two omnis and some
DSP" but "utilize an acoustical design to achieve directionality".
4mm wide is not too large, 22mm a bit more problematic. There seem to
be some other components on what is presumably a PCB.
This makes it difficult to mount several in an array. Two, back to
back, might make some sort of figure-8 and a first order ambisonic
mic may be feasible, but beyond that ??
But not a very small 1st order mic inside some phone, apparently.
Interesting:
http://embedded.harman.com/directional-mems-microphones.html
But those cardoid mems are not small...
As also Marc saw but not me...
Well, it looks like Arkamys just tries to implement some "function" ("VR
audio mic inside some smartphone"), in maybe the only possible way.
Anybody who believes that this is a .... (whatever) solution can try to
improve on this later. O:-)
Best,
Stefan
P.S.: Couldn't we have some better (1st order) results just using < more
> small omni capsules? (mounted on some small sphere)
If this doesn't fit into some phone, it will certainly into some VR camera.
And you also could start thinking about HOA capture. Just for CE and
"YouTube 360º" applications, of course...
Sebastià V. Amengual wrote:
I could be wrong, but as I understand, as far as the distance between
the microphones is much smaller than
the wavelength, it is possible to obtain first-order microphones with
any kind of directional pattern. Thus,
at least for a limited frequency range they could create the four
cardioid signals or directly the B format
signals, just using linear combinations of the signals (delay and
sum). Again, for a limited frequency range...
Yes, but "how limited"?
Because Ambisonics works best at low frequencies and this mike best at
high frequency range (?), your hint matters - but there seems to be
still some real problem here.
I believe you could build such a miniaturized SF mike easily with
cardioid-response MEMS capsules - if really available!
Could be a fun project... "Everybody knows" that a SF mike is a good
and flexible stereo mike as well. (Virtual microphones.)
Means all you could record stereo or B format ("360º-720º YT audio"
:-P ) w/ your smartphone.
Best,
Stefan
P.S.: As said before this would be a CE microphone just being "good
enough" - not an attempt to design a cheap professional mike.
I am not sure how they would manage to get an acceptable directivity
at all frequencies...
I worked on comparing different methods in my master thesis analyzing
the performance using different spacing
between microphones, just in case anyone is interested on this
http://www.diva-portal.org/smash/get/diva2:752195/FULLTEXT01.pdf
Thanks!
Best,
Sebastià
A 30.10.2016 14:41, Jörn Nettingsmeier escrigué:
On 10/28/2016 08:22 PM, Marc Lavallée wrote:
Here’s the link to the first “article":
https://www.arkamys.com/ambisonic-microphone-ep01/
<https://www.arkamys.com/ambisonic-microphone-ep01/>
What a load of bollocks. Four omni capsules spaced closely together
will give you... [drum roll]... an omni microphone. So yeah, we've got
W, so we're ambisonic :)
They probably got inspired by the other loads of bollocks that get
attached to VR camera rigs to enable them to be marketed as A/V
solutions. Nokia and others do it, so it must work, right?
It's nice if video and recorded ambient sound are recorded from the
same perspective?
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