Re: [Sursound] Integrating binaural recordings into ambisonics

[Politis Archontis]

Hi Jamie,

I’m not sure the transaural to B-format approach would work as, if I understand 
correctly, the cross-talk cancelation filters equalize the direct paths and 
minimize the cross-talk paths
at two control points that are spaced apart (the ears). I’m not sure how you 
would capture that information with coincident recording?

One approach that could work is a parametric approach DirAC-like, but that 
would require quite some work. For that you need an estimate of diffuseness 
(based on the interaural coherence) and an estimate of the direciton of arrival 
(based on estimated interaural time and level differences). Then you could 
re-encode you binaural signals to B-format based on these parameters.

There are quite a few details missing from the above description but I think 
it’s possible, even though it needs a careful implementation and some 
experimentation.
You can also check some quite ahead of its time work from Julia Jakka in her 
master’s thesis here in Aalto university:

http://lib.tkk.fi/Dipl/2005/urn007903.pdf

Best regards,
Archontis


On 11 May 2016, at 21:10, Jamie Smith 
<jamie.sm...@uhi.ac.uk<mailto:jamie.sm...@uhi.ac.uk>> wrote:

Hello all,
new subscriber here, so apologies if this topic has already been discussed.

Can anyone offer a way of successfully integrating a recording that
has been made binauraly into an ambisonic project?  The end product
would be delivered on headphones but, critically, must allow for head
tracking.  Clearly the two methods have compatibility issues.

As a work-around I have considered this:
binaural recording - pass through transaural processor (or similar) -
send to 2 virtual speakers - encode into b-format - listen on
headphones via ambi explorer or some VR player.

It seems convoluted and likely to degrade the spatial and spectral information.

Any thoughts?


Jamie Smith
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Re: [Sursound] Multi-channel Audio Interfaces For Ambisonics Playback?

[len moskowitz]

Thanks, Michael. I'm trying to move away from Firewire, as that seems to 
have died as a computer interface, so the MOTU Traveler is out of 
consideration.



I see that the MOTU 16A has 16 analog outputs, with Thunderbolt and USB2 
interfaces:



http://motu.com/products/avb/16a




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


-


On Wed, May 11, 2016 at 10:24 AM, Michael Chapman wrote:


MOTU Traveller (because I had one (got it for recording))
feeding a
Behringer 8-ch DtoA (because it was cheap)

Gives 18 channels,

(The MOTU gives 10 analogue, so you could get 12 by adding
-S/PDIF to A converter
or
-AES/EBU to A converter.)

Not a planned system,  just what was about ... but it works fo me.

Regards,

Michael


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Re: [Sursound] Multi-channel Audio Interfaces For Ambisonics Playback?

[Augustine Leudar]

I use a Motu 24 ao . I also have an RME raydat with several Behringer
ada8200 as backup. Nearly all DA converters have noise below audible levels
these days - even laptops. I also have a motu ultralite mk3 - which can do
12 outputs if you use the stereo headphone jack.

On 11 May 2016 at 13:54, len moskowitz <lenmoskow...@optonline.net> wrote:

> What are you using as the audio interface for a playback system having up
> to 12 speakers?
>
>
> I see that Tascam has their US-20x20. What else is out there that has low
> noise?
>
>
>
> Len Moskowitz (mosko...@core-sound.com)
> Core Sound LLC
> www.core-sound.com
> Home of TetraMic
> ___
> Sursound mailing list
> Sursound@music.vt.edu
> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here,
> edit account or options, view archives and so on.
>



-- 
Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
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[Sursound] Multi-channel Audio Interfaces For Ambisonics Playback?

[len moskowitz]

What are you using as the audio interface for a playback system having 
up to 12 speakers? 



I see that Tascam has their US-20x20. What else is out there that has 
low noise?




Len Moskowitz (mosko...@core-sound.com)
Core Sound LLC
www.core-sound.com
Home of TetraMic
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[Sursound] Integrating binaural recordings into ambisonics

[Jamie Smith]

Hello all,
new subscriber here, so apologies if this topic has already been discussed.

Can anyone offer a way of successfully integrating a recording that
has been made binauraly into an ambisonic project?  The end product
would be delivered on headphones but, critically, must allow for head
tracking.  Clearly the two methods have compatibility issues.

As a work-around I have considered this:
binaural recording - pass through transaural processor (or similar) -
send to 2 virtual speakers - encode into b-format - listen on
headphones via ambi explorer or some VR player.

It seems convoluted and likely to degrade the spatial and spectral information.

Any thoughts?


Jamie Smith
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Re: [Sursound] YouTube now supports Ambisonics (warning....part advertisement..)

[Michael Chapman]

>

Thanks to Albert I found:


"A Perl script that that 'corrects' the headers on Wave Format Extensible
files."

It won't solve Aaron's problem, but could be modified.

Michael


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