[PD] 6 speakers in a circle, ambi? vbap?

[Nicholas Mariette]

don't know if the zip file got through or not.
Here are text versions.
hopefully they come through ok.
nick


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On Oct 6, 2008, at 12:18 PM, Nicholas Mariette wrote:

> hi Hans,
>
> VBAP is probably better if you expect people to move around in the  
> installation space and you wish to pan individual sounds in  
> different directions.
> First order ambisonics works fine on 6 speakers, but it would be  
> more suited to immersive, enveloping ambient sounds, or a more  
> constrained audience.
>
> Horizontal VBAP will use only the nearest 2 speakers to simulate a  
> sound in one direction, while ambisonics decoding will generally use  
> all speakers for the same simulated sound source.  Thus VBAP sounds  
> will often seem to "snap to speaker positions" when panning around  
> the circle, whereas ambisonic panned sounds will not reveal the  
> individual speakers as much, but the illusion will not work as well  
> away from the centre of the room.
>
> I like the description I heard recently from Bruce Wiggins on the  
> difference between VBAP and ambisonics - that VBAP is exactly  
> correct for panning a sound when it's in the direction of a speaker,  
> but quite wrong when panning exactly in-between two speakers.   
> Ambisonics on the other hand is "equally wrong" (to a lesser degree  
> than VBAP between speakers) for a sound in any direction.
>
> In many cases, the best spatialisation solution could be a mixture  
> of both VBAP (for directional sounds) and ambisonic (for spatial  
> ambience) - unless the audience isn't able to get too close to the  
> speakers, or you use higher order ambisonics.
>
> The IEM ambi stuff is all in Pd extended browser... I guess you've  
> seen that.
> I've attached some patches that I have for encoding to quad.
>
> Only problem is the latest 2 releases of Pd extended seem to have  
> problems loading mtx_*~ object.
> I got it working with Pd extended 0.39.3
>
> Output is for 4 speakers, but it's easy enough to change the speaker  
> specifications in the nmg_bf2quad~  abstraction - go into the pd  
> calc-matrix subpatch, make up a new speaker spec, print the decode  
> matrix and copy that back into the patch.
>
> Hope this helps.
>
> Nick Mariette
> http://soundsorange.net
>
>
> <test_ambi.zip>
>
>
>
>
>
>
>
>
> On Oct 6, 2008, at 6:39 AM, Hans-Christoph Steiner wrote:
>
>>
>> So I am working on sound for a permanent installation involving 6
>> speakers in a large circular room.  Are 6 speakers enough to do
>> anything useful using ambisonics?  Or am I better off using the
>> simpler vbap?
>>
>> I am just starting to understand the basics of ambisonics, thanks to
>> Florian's intro.  I will be programmatically controlling the position
>> of the samples, since it will be synced up with a video.  So I don't
>> think I really need the GUIs like cubemixer.
>>
>> Are there any simple, working demos of the IEM ambi stuff?
>>
>> .hc
>>
>>
>> ------------------------------------------------------------------------
>> ----
>>
>> I have the audacity to believe that peoples everywhere can have three
>> meals a day for their bodies, education and culture for their minds,
>> and dignity, equality and freedom for their spirits.      - Martin
>> Luther King, Jr.
>>
>>
>>
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