Forums > MaxMSP

Speakers location calculation

February 1, 2009 | 12:01 pm

Hi
I was wondering: if I am preparing a piece, using Ambisonics with a
set of 8 speakers in a cubic setup,
what changes if the speakers are not actually setup in a cube, but
closer to a cuboid?
I mean if the base it’s not really a square , but a rectangle?

Is there a way to calculate azimuth and elevation proportionally to
the real distances ?

thank you in advance

tom


February 1, 2009 | 12:31 pm

i found the icst ambisonic externals tremendously helpful for dealing
with these kind of situations.
http://www.icst.net/downloads/
(max 4.6 only at the moment)
in their examples, there is a complete ambisonic "channelstrip". i
have expanded on this and made into a standalone, which recieved 8
channel-audio from a max5 patch via soundflower. worked well for a 90
min concert.

hth
h
http://www.hans-w-koch.net

Am 01.02.2009 um 13:01 schrieb Tommaso Perego:

> Hi
> I was wondering: if I am preparing a piece, using Ambisonics with a
> set of 8 speakers in a cubic setup,
> what changes if the speakers are not actually setup in a cube, but
> closer to a cuboid?
> I mean if the base it’s not really a square , but a rectangle?
>
> Is there a way to calculate azimuth and elevation proportionally to
> the real distances ?
>
> thank you in advance
>
> tom
>


February 1, 2009 | 12:59 pm

hi hans, thank you for answering.
what do you mean exactly with channelstrip ?
i use ambisonics and i know how to setup speakers location in the
ambiencode/ambiendecode

but in which way, one can calculate the relation on azimuth/elevation
location with the real phisical location of the speakers?
it doesn’t matter maybe?

On 1 Feb 2009, at 12:31, hans w. koch wrote:

> i found the icst ambisonic externals tremendously helpful for
> dealing with these kind of situations.
> http://www.icst.net/downloads/
> (max 4.6 only at the moment)
> in their examples, there is a complete ambisonic "channelstrip". i
> have expanded on this and made into a standalone, which recieved 8
> channel-audio from a max5 patch via soundflower. worked well for a
> 90 min concert.
>
> hth
> h
> http://www.hans-w-koch.net
>
>
>
>
>
> Am 01.02.2009 um 13:01 schrieb Tommaso Perego:
>
>> Hi
>> I was wondering: if I am preparing a piece, using Ambisonics with a
>> set of 8 speakers in a cubic setup,
>> what changes if the speakers are not actually setup in a cube, but
>> closer to a cuboid?
>> I mean if the base it’s not really a square , but a rectangle?
>>
>> Is there a way to calculate azimuth and elevation proportionally to
>> the real distances ?
>>
>> thank you in advance
>>
>> tom
>>
>


February 1, 2009 | 1:31 pm

Hi Tommaso,

Unless I’m misunderstanding you:

You need to measure the dimensions of your cuboid (length, width,
height), and nominate an ‘ideal’ listening position (such as the dead
centre). Then use basic trigonometry to get your angles.

Ambisonics relies on this info being as accurate as you can make it in
order to function well.


Owen

Tommaso Perego wrote:
> but in which way, one can calculate the relation on azimuth/elevation
> location with the real phisical location of the speakers?
> it doesn’t matter maybe?
>
>


February 1, 2009 | 1:44 pm


February 1, 2009 | 2:38 pm

got it.
thank you

On 1 Feb 2009, at 13:31, Owen Green wrote:

> Hi Tommaso,
>
> Unless I’m misunderstanding you:
>
> You need to measure the dimensions of your cuboid (length, width,
> height), and nominate an ‘ideal’ listening position (such as the dead
> centre). Then use basic trigonometry to get your angles.
>
> Ambisonics relies on this info being as accurate as you can make it in
> order to function well.
>
> —
> Owen
>
> Tommaso Perego wrote:
>> but in which way, one can calculate the relation on azimuth/elevation
>> location with the real phisical location of the speakers?
>> it doesn’t matter maybe?
>>
>>
>


February 1, 2009 | 2:39 pm


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