I think COMPASS should upsample from 2nd order to 3rd order (and higher).
However, the Octomic is not giving full 2nd order. (2h1v)
You still could set the missing element (FuMa R element, ACN 8) to 0
and do this.
Has anybody tried this?
Best,
Stefan
----- Mensagem de Steven Boardman <boardroomout...@gmail.com> ---------
Data: Fri, 23 Oct 2020 14:04:21 +0100
De: Steven Boardman <boardroomout...@gmail.com>
Assunto: Re: [Sursound] ORTF-3D With Higher-order Ambisonics
Para: Surround Sound discussion group <sursound@music.vt.edu>
Hi Len
I know Harpex is only first order, and a calibrated 2nd order mic
will produce better first order patterns. I was referring to just
Tetramic when I mentioned 1st order...
My point about Harpex was; you tried to do ORTF with only one
Octomic, and it wasn’t good.
Did you try to do 3D ORTF with 2 Octomic, experimenting with
positions, and which position each Harpexed Octomic synthesises?
Maybe Octomics on an opposing corner with Harpex from each decoding
alternately into the other corners?
The two Octomics could each have the 2 straightforward decodes (to
obtain 4 vertexes). But each of the other corners have 1 spaced
decode from each Octomic.
So the other vertexes are more deco-related from using alternate
Octomic spaced Harpex decodes.
Hope that makes sense, or shoot me down with bag of crap…:)
PS don’t suppose you have a super-cardioid response of the Octamic?
The CCM41 capsules used in the 3D ORTF are excellent, with pretty
dam good polar response upto 16k. (Obviously they wouldn’t be anyway
near the same in an array being so close to each other:)
https://schoeps.de/en/products/ccm/ccm-microphones/supercardioids/ccm-41.html
On 23 Oct 2020, at 03:16, moskowitz <lenmoskow...@optonline.net> wrote:
Steven Boardman wrote:
Have you tried it with first order?
I would of thought using one Harpexed octomic to synthesise all the spaced
mics, would be a bit blurry, did you try with two?
Harpex only operates at first-order.
We used OctoMic's first-order B-format as input to Harpex.
We've used two OctoMics for ORTF. Since OctoMic's cardioid patterns
are so stable and consistent, and because pointing angles can be
fine-tuned in post, two OctoMics make probably the world's finest
ORTF array.
Len Moskowitz (mosko...@panix.com)
Core Sound LLC
www.core-sound.com
Home of OctoMic and TetraMic
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