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[Csnd] Re: [OT] A sound cube?

Date2010-10-10 20:54
FromMartin Leese
Subject[Csnd] Re: [OT] A sound cube?
apalomba wrote:
>> I am very interested in this as well. I would like to have a simple 8.1 channel
>> cube that would be easy to transport and setup at gigs.
>>
>> The simplest setup I can imagine is an audio interface with 8 channel output.
>> The mixing is done on the computer and then sent to the right channel.
>>
>> Ideally it would be nice to have the speakers be wireless, so some
>> kind of receiver may need to be part of the chain.
>>
>> So the question is why do you need such a complicated setup?
>> Does Ambisonics allow you to do something that the above
>> setup does not?

apalomba wrote:
>> Can someone please answer my question...
>>
>> Why do you need such a complicated setup?
>> Does Ambisonics allow you to do something that
>> a multi channel audio interface does not?

It all depends what you wish to do.  If all you
want is to place sounds in any one of your
eight speakers then you are onto a winner.
However, if you want to place sounds between
the speakers -- if you wish to create phantom
images -- then you must use a mixing style.

There are a number of different mixing styles
you could use in 3-D.  One is Ambisonics.
In general, this uses all the speakers to
localise a sound.  While the speakers on the
left push, those on the right pull.

An alternative is VBAP (Vector Based
Amplitude Panning).  This uses, at most, the
nearest three speakers.  It is the 3-D
equivalent of pair-wise mixing used for
panning in stereo.  Almost all stereo CDs use
pair-wise mixing.  The problem with using it for
surround (horizontal or 3-D) is that it does not
work.  You can hear this for yourself by
performing the very simple experiment
described here:
http://members.tripod.com/martin_leese/Ambisonic/exper.html

For more information on Ambisonics, a good
place to start is the article in Wikipedia.  I
don't know of a good reference for VBAP, but
there must be one.

Regards,
Martin

Date2010-10-10 21:21
Fromjoachim heintz
Subject[Csnd] Re: Re: [OT] A sound cube?
for VBAP, there are some links here:
http://www.acoustics.hut.fi/~ville/

i always had the best experiences working with the vbap opcodes in  
csound.

in qutecsound 0.6.0, there is a comparison between ambisonics and vbap  
(examples > miscellaneous > spatialization).

	joachim


Am 10.10.2010 um 21:54 schrieb Martin Leese:

> apalomba wrote:
>>> I am very interested in this as well. I would like to have a  
>>> simple 8.1 channel
>>> cube that would be easy to transport and setup at gigs.
>>>
>>> The simplest setup I can imagine is an audio interface with 8  
>>> channel output.
>>> The mixing is done on the computer and then sent to the right  
>>> channel.
>>>
>>> Ideally it would be nice to have the speakers be wireless, so some
>>> kind of receiver may need to be part of the chain.
>>>
>>> So the question is why do you need such a complicated setup?
>>> Does Ambisonics allow you to do something that the above
>>> setup does not?
>
> apalomba wrote:
>>> Can someone please answer my question...
>>>
>>> Why do you need such a complicated setup?
>>> Does Ambisonics allow you to do something that
>>> a multi channel audio interface does not?
>
> It all depends what you wish to do.  If all you
> want is to place sounds in any one of your
> eight speakers then you are onto a winner.
> However, if you want to place sounds between
> the speakers -- if you wish to create phantom
> images -- then you must use a mixing style.
>
> There are a number of different mixing styles
> you could use in 3-D.  One is Ambisonics.
> In general, this uses all the speakers to
> localise a sound.  While the speakers on the
> left push, those on the right pull.
>
> An alternative is VBAP (Vector Based
> Amplitude Panning).  This uses, at most, the
> nearest three speakers.  It is the 3-D
> equivalent of pair-wise mixing used for
> panning in stereo.  Almost all stereo CDs use
> pair-wise mixing.  The problem with using it for
> surround (horizontal or 3-D) is that it does not
> work.  You can hear this for yourself by
> performing the very simple experiment
> described here:
> http://members.tripod.com/martin_leese/Ambisonic/exper.html
>
> For more information on Ambisonics, a good
> place to start is the article in Wikipedia.  I
> don't know of a good reference for VBAP, but
> there must be one.
>
> Regards,
> Martin
> -- 
> Martin J Leese
> E-mail: martin.leese  stanfordalumni.org
> Web: http://members.tripod.com/martin_leese/
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body  
> "unsubscribe csound"
>
>



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