[Sursound] Listening to the neural network gradient norms during training

[Gary Gallagher]

http://blog.christianperone.com/2019/08/listening-to-the-neural-network-gradient-norms-during-training/
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Re: [Sursound] The Acoustics of Domes

[David Worrall]

Hi Sean,

My group’s first ambisonic dome was a 7m radius 4v icosa geodesic hemisphere in 
the late 1980s, and others subsequently:

Photos and descriptions etc here:  http://www.avatar.com.au/wpsite/?page_id=41

and an ancient paper on the original project here: 
http://www.avatar.com.au/papers/Multichannel%20Performance.pdf

 

There’s another two on the drawing board as we speak.

We could skype about the technical issues if you’d like.

 

Cheers,

David

 

---

Dr David Worrall

Professor, Audio Arts and Acoustics

Columbia College Chicago

33 E. Ida B. Wells Drive Room 601A

Chicago, ILLINOIS, USA 60605

Wikipedia: David Worrall

Personal research/creative practice website: avatar.com.au

Some music/sonification: on soundcloud  Youtube videos

New Book: Sonification Design: From data to intelligible soundfields (Springer)

 

 

From: Sursound  on behalf of Sean Devonport 

Reply-To: Surround Sound discussion group 
Date: Wednesday, August 7, 2019 at 13:39
To: 
Subject: [Sursound] The Acoustics of Domes

 

Hey there everyone! Hope you're all well.

 

I wanted to ask if anyone on the group has experience setting up a

multichannel rig for a dome setup? Specifically designed to play Ambisonics.

 

I've been working with a team looking to build a VR hemispherical dome that

can display 360 video alongside Ambisonic content. The design for the dome

structure is complete and now we're just figuring out the sound component.

The sound is meant to fit seamlessly, and no obstruction should be on the

floor.

 

The dome is roughly 7m diameter, and built out of a fibre glass type

material. We're planning to have a two layer type sound setup, so with

roughly 14 speakers per layer plus a voice of god and a sub so (14-14-1.1).

I was thinking that it could be an interesting idea to mount the sub in the

ceiling above the VOG position, my reasoning being that the sub should

emanate evenly across the floor of the dome, and it would prevent the need

to have multiple subs outside the dome structure on the floor.

 

I've never setup in a dome before and I can imagine the acoustics must be a

little strange. Upon watching this video (

https://www.youtube.com/watch?v=JpdRYv9xA9w), I seem to get the feeling the

task may get quite interesting. I'm hoping someone may have some experience

with this.

 

Some problems that I think may occur:

1. A boomy bass at floor level.

2. Room resonances and standing waves that don't seem to be very well

studied.

 

I think first port of call for the Ambisonic setup is to ensure that each

speaker is calibrated to be the same loudness and time delay at the

listening position. From there, I've been looking into applying an averaged

DRC filter over the entire listening space to each loudspeaker to try get

the most accurate speaker response for the listening area although I know

this is quite a tricky challenge. I'm hoping that the DRC may help to

mitigate some of the room resonances, however, I'd love to get a second (or

more) opinion on how this would affect the setup.

 

Anyone with any advice or resources on this would be very much appreciated!

 

Thanks in advance.

 

-- 

Sean Devonport

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Re: [Sursound] The Acoustics of Domes

[Augustine Leudar]

Hi Sean
Ive lots of experuence doing 3d sound in domes. Feel free to PM me
Best
Gus

On Wednesday, 7 August 2019, Sean Devonport 
wrote:

> Hey there everyone! Hope you're all well.
>
> I wanted to ask if anyone on the group has experience setting up a
> multichannel rig for a dome setup? Specifically designed to play
> Ambisonics.
>
> I've been working with a team looking to build a VR hemispherical dome that
> can display 360 video alongside Ambisonic content. The design for the dome
> structure is complete and now we're just figuring out the sound component.
> The sound is meant to fit seamlessly, and no obstruction should be on the
> floor.
>
> The dome is roughly 7m diameter, and built out of a fibre glass type
> material. We're planning to have a two layer type sound setup, so with
> roughly 14 speakers per layer plus a voice of god and a sub so (14-14-1.1).
> I was thinking that it could be an interesting idea to mount the sub in the
> ceiling above the VOG position, my reasoning being that the sub should
> emanate evenly across the floor of the dome, and it would prevent the need
> to have multiple subs outside the dome structure on the floor.
>
> I've never setup in a dome before and I can imagine the acoustics must be a
> little strange. Upon watching this video (
> https://www.youtube.com/watch?v=JpdRYv9xA9w), I seem to get the feeling
> the
> task may get quite interesting. I'm hoping someone may have some experience
> with this.
>
> Some problems that I think may occur:
> 1. A boomy bass at floor level.
> 2. Room resonances and standing waves that don't seem to be very well
> studied.
>
> I think first port of call for the Ambisonic setup is to ensure that each
> speaker is calibrated to be the same loudness and time delay at the
> listening position. From there, I've been looking into applying an averaged
> DRC filter over the entire listening space to each loudspeaker to try get
> the most accurate speaker response for the listening area although I know
> this is quite a tricky challenge. I'm hoping that the DRC may help to
> mitigate some of the room resonances, however, I'd love to get a second (or
> more) opinion on how this would affect the setup.
>
> Anyone with any advice or resources on this would be very much appreciated!
>
> Thanks in advance.
>
> --
> Sean Devonport
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>


-- 
Dr. Augustine Leudar
Artistic Director Magik Door LTD
Company Number : NI635217
Registered 63 Ballycoan rd,
Belfast BT88LL
www.magikdoor.net
+44(0)7555784775
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Re: [Sursound] The Acoustics of Domes

[Ralph Glasgal]

It is now relatively easy to get a full circle of direct sound in the
horizontal plane for about four listeners with just four speakers.  An
Ambiodipole in front and one in the rear reproducing a 4.0 dual pair from an
Ambisonics source or any 3D recording.  For height if you need more than
hall ambience you can add height speakers to taste and feed them them Z
signals.  It is like being in a concert hall with a full orchestra spread
out in front and one in the rear behind you.  If you rotate your head it is
like rotating your head in a hall.  If you stand up and face sideways, then
you hear an orchestra to your right and one to your left just as in a real
hall.  However, if you are talking about far side objects then if you face
sideways, the object may not seem to be directly in front of you.  But this
technology is a lot easier and cheaper to implement and has a significant
wow factor.  Lots of AES papers, links and demo tracks at
www.ambiophonics.org

Also you may find that your bass problem is a lot easier to fix.

Ralph Glasgal 

-Original Message-
From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Sean
Devonport
Sent: Wednesday, August 07, 2019 2:38 PM
To: sursound@music.vt.edu
Subject: [Sursound] The Acoustics of Domes

Hey there everyone! Hope you're all well.

I wanted to ask if anyone on the group has experience setting up a
multichannel rig for a dome setup? Specifically designed to play Ambisonics.

I've been working with a team looking to build a VR hemispherical dome that
can display 360 video alongside Ambisonic content. The design for the dome
structure is complete and now we're just figuring out the sound component.
The sound is meant to fit seamlessly, and no obstruction should be on the
floor.

The dome is roughly 7m diameter, and built out of a fibre glass type
material. We're planning to have a two layer type sound setup, so with
roughly 14 speakers per layer plus a voice of god and a sub so (14-14-1.1).
I was thinking that it could be an interesting idea to mount the sub in the
ceiling above the VOG position, my reasoning being that the sub should
emanate evenly across the floor of the dome, and it would prevent the need
to have multiple subs outside the dome structure on the floor.

I've never setup in a dome before and I can imagine the acoustics must be a
little strange. Upon watching this video (
https://www.youtube.com/watch?v=JpdRYv9xA9w), I seem to get the feeling the
task may get quite interesting. I'm hoping someone may have some experience
with this.

Some problems that I think may occur:
1. A boomy bass at floor level.
2. Room resonances and standing waves that don't seem to be very well
studied.

I think first port of call for the Ambisonic setup is to ensure that each
speaker is calibrated to be the same loudness and time delay at the
listening position. From there, I've been looking into applying an averaged
DRC filter over the entire listening space to each loudspeaker to try get
the most accurate speaker response for the listening area although I know
this is quite a tricky challenge. I'm hoping that the DRC may help to
mitigate some of the room resonances, however, I'd love to get a second (or
more) opinion on how this would affect the setup.

Anyone with any advice or resources on this would be very much appreciated!

Thanks in advance.

-- 
Sean Devonport
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[Sursound] The Acoustics of Domes

[Sean Devonport]

Hey there everyone! Hope you're all well.

I wanted to ask if anyone on the group has experience setting up a
multichannel rig for a dome setup? Specifically designed to play Ambisonics.

I've been working with a team looking to build a VR hemispherical dome that
can display 360 video alongside Ambisonic content. The design for the dome
structure is complete and now we're just figuring out the sound component.
The sound is meant to fit seamlessly, and no obstruction should be on the
floor.

The dome is roughly 7m diameter, and built out of a fibre glass type
material. We're planning to have a two layer type sound setup, so with
roughly 14 speakers per layer plus a voice of god and a sub so (14-14-1.1).
I was thinking that it could be an interesting idea to mount the sub in the
ceiling above the VOG position, my reasoning being that the sub should
emanate evenly across the floor of the dome, and it would prevent the need
to have multiple subs outside the dome structure on the floor.

I've never setup in a dome before and I can imagine the acoustics must be a
little strange. Upon watching this video (
https://www.youtube.com/watch?v=JpdRYv9xA9w), I seem to get the feeling the
task may get quite interesting. I'm hoping someone may have some experience
with this.

Some problems that I think may occur:
1. A boomy bass at floor level.
2. Room resonances and standing waves that don't seem to be very well
studied.

I think first port of call for the Ambisonic setup is to ensure that each
speaker is calibrated to be the same loudness and time delay at the
listening position. From there, I've been looking into applying an averaged
DRC filter over the entire listening space to each loudspeaker to try get
the most accurate speaker response for the listening area although I know
this is quite a tricky challenge. I'm hoping that the DRC may help to
mitigate some of the room resonances, however, I'd love to get a second (or
more) opinion on how this would affect the setup.

Anyone with any advice or resources on this would be very much appreciated!

Thanks in advance.

-- 
Sean Devonport
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