Hi Thorsten,
Your proposed mapping could be considered a subset of
https://www.itu.int/rec/R-REC-BS.2051-3-202205-I/
Favored loudspeaker layouts for Ambisonics reproduction use the same
angular increment (in each horizontal ring), but it's also possible to
decode to all loudspeakers of an irregular array (for example as defined
in the ITU standard), and it could be better to not use all available
loudspeakers.
Marc
Le 2023-05-01 à 14 h 03, Thorsten Michels a écrit :
Hi all!
I was wondering too, how to stream a HOA audio stream over the web A
N D make it easily consumable.
This sounds like a need for a new "standard" to me.
If it's not there yet, we have to define and build it. Like the nice
people did when they defined AmbiX.
I am not a coder, but I think it could be done if someone writes a
plug-in for a webbrowser ??????
So, if the "specification" is there and agreed, this could be proposed
to the AES and it can be discussed by a world-wide forum of audio
engineers and experts.
Well, then let's start the discussion.
1. Requirements
The standard for streaming HOA must be upward and downward compatible.
So it must not make any difference, if a FOA or 3OA stream is transfered.
If a lower order is streamed, the other channels will be left empty,
with digital "0", meaning absolutely NO signal. So the decoders can
recognize it and provide the correct decoding.
2. Channels and their discription
The order of the channels will be as follows:
*Channel**
* *Description**
*
1
Channel 1 - "Front Left"
2
Channel 2 - "Front Center"
3
Channel 3 - "Front Right"
4
Channel 4 - "Left Surround"
5
Channel 5 - "Right Surround"
6
Channel 6 - "Surround Mid Left"
7
Channel7 - "Surround Mid Right"
8
Channel 8 - "High Front Left"
9
Channel 9 - "High Front Center"
10
Channel 10 - "High Front Right"
11
Channel 11 - "High Surround Left "
12
Channel 12 -" High Surround Center"
13
Channel 13 - "High Surround Right"
14
Channel 14 - "High Surround Mid Left"
15
Channel 15 - "High Surround Mid Right"
16
Channel 16 - "Voice of up above"
17
LFE
18
Optional Channel 1 (Low Level - Left ?)
19
Optional Channel 2 (Low Level - Center?)
20
Optional Channel 3 (Low Level - Right?)
21
Optional Channel 4 (Low Level - Surround Left?)
22
Optional Channel 5 (Low Level - Surround Right?)
23
Optional Channel 6 ("Voice from below"?)
24
SMPTE TimeCode
This is my very first suggestion. The names are just names, to give
some guidance and can be changed if required.
There is no "prior art" to my knowledge. If there is, I would be more
than happy to learn about it.
Let's start the discussion, if this makes sense for this forum.
Once we found a "final" solution, we propose it to the AES forum and
see what feedback we'll get.
Cheers
Thorsten
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