Re: [Sursound] Virtual Microphone Processors for HOA?

[Politis Archontis]

Hi Stefan,

On 12 Oct 2017, at 02:50, Stefan Schreiber 
> wrote:

Omnitone offers ambisonic decoding and binaural rendering of:

   * First-order-ambisonic stream
   * High-order-ambisonic stream: 2nd and 3rd order.

The input audio stream can be either an HTMLMediaElement ( or  
tag) or a multichannel AudioBufferSourceNode.

I may be wrong, these things change quite quickly, but the HTMLMediaElement, 
which could be used for live streaming does not support more than 8ch at the 
moment, hence it would work with FOA only, while the AudioBufferSourceNode can 
handle up to 32 (hence 4th-order) but works only with loading audiofiles.

BR,
Archontis Politis





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Re: [Sursound] Virtual Microphone Processors for HOA?

[Stefan Schreiber]

Politis Archontis wrote:


Hi Len,

you can find a higher-order virtual microphone implementation in our web-audio 
ambisonics library, implementing higher-order cardioids, supercardioids, and 
hypercardioid patterns. The library is open-source and generates the patterns 
for any order, even though Web Audio supports up to 4th-order signals (without 
tricks) at that point. You can find a real-time 3rd-order demo here:

https://cdn.rawgit.com/polarch/JSAmbisonics/e28e15b384f2442a66fadc0035439c64ed65fa4d/examples/hoa-virtual-mic.html

If you manage to stream your 9 second-order signals somehow in the browser, 
then you can process them live there, but unfortunately I think HTML5 supports 
up to 8 channels for streaming audio, so at the moment HOA material works only 
with wav/ogg files.
 



I don't believe this is (still?) true:

https://github.com/GoogleChrome/omnitone


Omnitone offers ambisonic decoding and binaural rendering of:

* First-order-ambisonic stream
* High-order-ambisonic stream: 2nd and 3rd order.

The input audio stream can be either an HTMLMediaElement ( or 
 tag) or a multichannel AudioBufferSourceNode.



BR

Stefan


Regards,
Archontis Politis
Post-doctoral Researcher
Department of Signal Processing and Acoustics
Aalto University
Finland


On 11 Oct 2017, at 19:43, len moskowitz 
> wrote:

We're introducing OctoMic next week at AES (booth 315). It's a 2nd-order 
ambisonic microphone.

Does anyone else have a virtual microphone processor for 2nd-order (or higher) 
B-format?



Len Moskowitz (mosko...@core-sound.com)
Core Sound LLC
www.core-sound.com
Home of TetraMic
 



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Re: [Sursound] Virtual Microphone Processors for HOA?

[stmar]

Citando Sven König :


On 11.10.2017 18:43, len moskowitz wrote:
We're introducing OctoMic next week at AES (booth 315). It's a  
2nd-order ambisonic microphone.

wow that's sounds interesting!
could something like the harpex method theoretically be used to  
upmix 2nd-order to 3rd-order yielding better results than upmixing  
b-format?


sven.



Harpex works only at 1st order. It is not likely that the Harpex  
method can be extended to >= 2nd order, for mathematical reasons.


Best,

Stefan


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Re: [Sursound] Virtual Microphone Processors for HOA?

[Sven König]

On 11.10.2017 18:43, len moskowitz wrote:
We're introducing OctoMic next week at AES (booth 315). It's a 
2nd-order ambisonic microphone. 

wow that's sounds interesting!
could something like the harpex method theoretically be used to upmix 
2nd-order to 3rd-order yielding better results than upmixing b-format?


sven.

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Re: [Sursound] Virtual Microphone Processors for HOA?

[Politis Archontis]

Hi Len,

you can find a higher-order virtual microphone implementation in our web-audio 
ambisonics library, implementing higher-order cardioids, supercardioids, and 
hypercardioid patterns. The library is open-source and generates the patterns 
for any order, even though Web Audio supports up to 4th-order signals (without 
tricks) at that point. You can find a real-time 3rd-order demo here:

https://cdn.rawgit.com/polarch/JSAmbisonics/e28e15b384f2442a66fadc0035439c64ed65fa4d/examples/hoa-virtual-mic.html

If you manage to stream your 9 second-order signals somehow in the browser, 
then you can process them live there, but unfortunately I think HTML5 supports 
up to 8 channels for streaming audio, so at the moment HOA material works only 
with wav/ogg files.

Regards,
Archontis Politis
Post-doctoral Researcher
Department of Signal Processing and Acoustics
Aalto University
Finland


On 11 Oct 2017, at 19:43, len moskowitz 
<lenmoskow...@optonline.net<mailto:lenmoskow...@optonline.net>> wrote:

We're introducing OctoMic next week at AES (booth 315). It's a 2nd-order 
ambisonic microphone.

Does anyone else have a virtual microphone processor for 2nd-order (or higher) 
B-format?



Len Moskowitz (mosko...@core-sound.com<mailto:mosko...@core-sound.com>)
Core Sound LLC
www.core-sound.com<http://www.core-sound.com>
Home of TetraMic
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[Sursound] Virtual Microphone Processors for HOA?

[len moskowitz]

We're introducing OctoMic next week at AES (booth 315). It's a 2nd-order 
ambisonic microphone.


Does anyone else have a virtual microphone processor for 2nd-order (or 
higher) B-format?




Len Moskowitz (mosko...@core-sound.com)
Core Sound LLC
www.core-sound.com
Home of TetraMic
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[Sursound] AES Technical Tour TT06

[Ralph Glasgal]

It has been while since I have been able to follow this list or contribute
to it and I am sorry about that.  But the Ambio team has not been idle in
the interim.

We would like to invite those coming to the NYC AES convention to sign up
for the technical tour leaving Saturday morning Oct. 21st at 9:00 AM to New
Jersey to hear the latest Ambiophonic surround apps, components, recordings
etc.  It is interesting that two of the six tours this year are devoted to
loudspeaker binaural/surround technologies and it is also the topic of the
Keynote address.  Indeed, Ambiophonics and similar technologies are now
superior alternatives to 2.0 stereo and 5.1 surround in most traditional
home applications and the already available apps do the same for
tablet/laptop/smart phone/etc. listening. 

The Ambiophonics team will be hosting demonstrations on three floors as
described below, there will indeed be a free lunch, and if you wish, you may
stay later than the official tour length.  Recording engineers may want to
see the Panambiophone surround mic array and hear some surround recordings
made with it.  It produces a full circle of direct sound in the horizontal
plane, via standard 4.0 media (DTS 5.1) when played back over just four
speakers for a group of listeners.  You may want to read some of the
tutorials or papers at  www.ambiophonics.org before you come.  Ralph Glasgal


 AES Technical Tour Destination, TT06  The Ambiophonics Institute
 
Come to learn and experience 2D, 3D, and VR sound the latest Ambiophonic
ways.  (Ambiophonics, the public domain successor to stereophonics, 5.1,
7.1, 10.2 Dolby Atmos, Auro 3d, etc.)  180° frontal and full 360° sound
stages will be auditioned using tracks from standard 2.0, 5.1 discs or
on-line media.

Note that the Ambio like stereo or binaural is a fundamental psychoacoustic
concept and so all the software/component systems here are not proprietary
and can be easily duplicated or used at relatively low cost by any AES
member.
Some 8 systems ranging from a tiny sound bar, to a tablet, to a laptop, to a
conventional two speaker system, to a 4K 3D picture and sound home theater,
to The Domestic Concert Hall (which duplicates the Sydney Opera House via 28
electrostatic and 2 CBT panels, curtesy of Angelo Farina) will showcase a
variety of exceptional but still standard media recordings, that have
largely hidden 3D characteristics when reproduced the old way.

We will be demonstrating Envelophonics which produces a sense of envelopment
for home systems just as in concert halls.  You will also be able to hear
what stereo source position distortion and inherent combing frequency
response sounds like and learn how to eliminate it.  The PanAmbiophone, will
be here for you to see how to make one for yourself.  Many free books and
technical papers available.

Five 78RPM acoustic Victrolas plus a selection of audio antiques will be on
display curtesy of the Audio History Library.   After the official tour has
ended those who wish to remain for further listening or discussion are
welcome to do so.  Free transportation back to the GWB A train subway
station will be available.
 




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