Re: [Sursound] New Ambisonic VST Plugins - follow up Question to Fons

[Bo-Erik Sandholm]

Hi
Am I to understand that everything is OK if I use the third order plugins to 
work on my first order tetramic recording.
And then I can expect everything to be as it should if I decode just the first 
order info via a first order ambdec ?

I do not at this time expect to add any second or third order signals in to my 
projects.

As a follow up question, would it be to my advantage to have the input signals 
"converted" to third order and stay there even for the decoding 
Even if I only have a speaker rig of a circle of six horizontal  and 2 speakers 
on the floor and 2 in the ceiling.

Depending on the answer how about if I reconfigure the playback to a horizontal 
hexagonal ring of 6 and top and bottom rings of 4, the intra speaker distance 
in the 4 rings being the same as the distance between the speakers in the 
hexagon?
Does third order decode add any advantage ?

Best Regards
Bo-Erik Sandholm

-Original Message-
From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Fons 
Adriaensen
Sent: den 22 november 2013 22:20
To: sursound@music.vt.edu
Subject: Re: [Sursound] New Ambisonic VST Plugins

On Fri, Nov 22, 2013 at 11:19:58AM -0800, Aaron Heller wrote:

> I hate to contradict you, but my experience playing my first-order 
> recordings (e.g. Pulcinella, LvB 4th Sym, available on Ambisonia) on 
> the 2nd or 3rd order presets in Ambdec results in decoding errors.  
> The most obvious artifact is that frontal sources sound too close, 
> sometimes right in front of my face.

When using a 3rd order max rE decoder with 1st order input, the gain on the 
first order signals is too high. The error is around 2.3 dB for a 2D decoder, 
and 3.5 dB for 3D. In both cases the resulting decode is closer to systematic 
(rV = 1) than to max rE.

For an in-phase decoder the errors are higher, around 5 dB for 3D.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically 
inflated market opportunities. (Cory Doctorow)

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Re: [Sursound] Hector bird recording - SoundCloud

[dw]

That seems to have fixed it. Nobody expects the strange knob position!
Not as big and wet as John's, but very clean and in front,.. she said.
https://www.dropbox.com/s/iga71wluxfcb4i6/Untitled2.mp3
https://www.dropbox.com/s/4elj3wj9wzd9rr2/Untitled.mp3


On 24/11/2013 00:08, Hector Centeno wrote:

Hello!

Yes, I gave those recordings to Umashankar before I got the microphone
calibrated. I just uploaded a B-format version converted using
Tetraproc and the preset file that Fons made for me after I gave him
my IR measurements. It's not exactly the same fragment but comes from
the same group of recordings. Those birds make indeed very strange
sounds, they are called Urracas in Mexico, were the recording was
done. This is obviously not a pure nature recording since it was done
in the backyard of a house in the city. I placed the mic right under
the tree where the birds were perching.

http://www.hcenteno.net/extras/Urracas_WXYZ.wav.zip

I'll try to get the music recording processed too by tomorrow.

Cheers!

Hector



On Fri, Nov 22, 2013 at 2:41 PM, Eric Benjamin  wrote:

Is the W level correct? I am finding myself turning up my W knob 3-6dB

I'm tempted to agree.  Of course it's difficult to be certain.



  From: dw 
To: sursound@music.vt.edu
Sent: Friday, November 22, 2013 6:21 AM
Subject: Re: [Sursound] Hector bird recording - SoundCloud


On 21/11/2013 19:08, Aaron Heller wrote:

I took the liberty of merging them into 4-channel files and putting them on
my server, which might be easier to access than the skydive (the UI was in
Japanese for me, fortunately I recognized the character for 'down')

http://ambisonics.dreamhosters.com/01-Birds_WXYZ-110425_0119.wav
http://ambisonics.dreamhosters.com/05-Music_WXYZ-110425_0127.wav

They sound quite nice.  In Harpex, you can clearly see the locations of the
singers, percussion, and birds.  Impressive!

Thanks...

Aaron (hel...@ai.sri.com)
Menlo Park, CA  US


Is the W level correct? I am finding myself turning up my W knob 3-6dB
relative to other recordings before it sounds good..
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