Hi all!
Let me first say an impressed "WOW!"
I learned so much reading all these emails and discovered new universes.
- WOW!
As I said, I am not an Ambisonic Pro. I am an enthusiast to the best
meaning of the word. So I did the best proposal I knew and started this
discussion.
I enjoy it and the many great proposals and ideas coming in. Now I have
plenty to read and I'll try my very best to catch up with you guys.
Nevertheless, as there is no "official" standard yet, we could at least
thrive to provide our feedback and "pull-requests" to existing projects.
And there is nothing to be sorry about saying my first try was not good
enough. I expected that! Now we have a place to start from and make it
better with any itteration.
I would like to keep this disussion going. In a sense of meritocracy,
not of flame-wars or putting someone down. Every idea may push us ahead,
so every idea is good and worthy. And if it is "only" useful for
verifying that we considered all ideas, choose the best ones and didn't
overlook something, that might become important once. (or not ;-) )
So, keep coming! PLEASE ask questions, propose any ideas and provide
feedback.
Thanks for your participation so far.
Take care and stay healthy
Cheers
Thorsten
Am 02.05.2023 um 19:49 schrieb Stefan Schreiber:
“Your proposed mapping could be considered a subset of
https://www.itu.int/rec/R-REC-BS.2051-3-202205-I/“
Sorry to say: Definitively not so!
A multichannel ordering L C R Ls does not correspond to recent
official channel ordering.
Normally you do L R C Lfe etc. This is what you have in the venerable
Wave format, ITU BS. 775, EBU standards, Mpeg/TV/3GPP standards, on
optical discs, Webaudio output ordering and nearly everywhere.
I would recommend not to make up some “programmer standards” without
studying what is already standardized anyway.
Best,
Stefan
P.S.: The proposed order would be “old Dolby cinema order”, extended
in some pretty arbitrary way.
----- Mensagem de Marc Lavallée <m...@hacklava.net> ---------
Data: Mon, 1 May 2023 14:27:39 -0400
De: Marc Lavallée <m...@hacklava.net>
Assunto: Re: [Sursound] [Proposal] for HOA web-streaming-format
Para: Thorsten Michels <t.mich...@posteo.de>
Cc: Surround Sound discussion group <sursound@music.vt.edu>
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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