[NewMusic] Core Sound ambisonic mics

[barry threw]

Agreed.  It's supposed to be a cardioid.  Not equal, hence the "kind  
of".

However, I've done it with an omni and it sounds different, but still  
maintains some imaging.  I would actually prefer the omni for some  
situations.

b

On Nov 7, 2007, at 11:35 AM, cliff caruthers wrote:

> Also, one bidirectional and omni does not equal m/s, even kind of.
> For the imaging to work properly, has to be a cardioid with with a
> figure eight...
> -Cliff
>
>
> On 11/7/07, Matt J. Ingalls <ingalls at mills.edu> wrote:
>>
>> barry:
>> tom is right. soundfield mic is 4 cartiods in a tetrahedron (a- 
>> format),
>> which is full 3-D. output is usually transcoded (simple add&subtract)
>> to b-format which is
>> the omni+3 bi-directional (WXYZ) you are talking about.
>> and i believe this is "1st order" whereas "2nd+ order" is more  
>> channels
>> added to that..
>>
>> -m
>>
>> On Wed, 7 Nov 2007, barry threw wrote:
>>
>>> You actually need 3 *bi-directional* mics and one omni, and they are
>>> as close to coincident as possible (without fancy delay processing).
>>> But, that is only for 3rd order (preserving height information).
>>>
>>> For second order you can need 2 bi and one omni; that will give you
>>> accurate recording of a 2D sound field.
>>>
>>> For stereo, all you need is one bi and one omni.  But thats M/S  
>>> (kind
>>> of) and we all knew about it.
>>>
>>> b
>>>
>>> On Nov 7, 2007, at 9:45 AM, Tom Duff wrote:
>>>
>>>>
>>>> Just noticed this for recording weenies:
>>>>
>>>> http://www.core-sound.com/TetraMic/1.php
>>>>
>>>> It's an ambisonic transducer (tetrahedral coincident array of  
>>>> cardioid
>>>> mics) for under $1000.  Looks great.  Len Moskowitz (Core Sound)
>>>> usually
>>>> makes first-rate stuff for the price.
>>>>
>>>> Ambisonic recording is extremely cool.  By using 4 directional mics
>>>> evenly
>>>> spaced in 3-D, you can, by appropriate mixing, simulate arbitrary
>>>> coincident microphone arrays.  If you use a 4-channel recorder, you
>>>> can
>>>> even change miking decisions after the fact.
>>>>
>>>> --
>>>> Tom Duff.  Hwanon ferigeath ge faette scyldas?
>>>> _______________________________________________
>>>> Bay Area New Music Discussion Group
>>>> NewMusic at music.mills.edu
>>>> http://music.mills.edu/mailman/listinfo/newmusic
>>>
>>> Barry Threw
>>> Media Art and Technology
>>>
>>>
>>> San Francisco, CA     Work: 857-544-3967
>>> Email: bthrew at gmail.com
>>> IM: captogreadmore (AIM)
>>> http:/www.barrythrew.com
>>>
>>>
>>>
>>> _______________________________________________
>>> Bay Area New Music Discussion Group
>>> NewMusic at music.mills.edu
>>> http://music.mills.edu/mailman/listinfo/newmusic
>>>
>> _______________________________________________
>> Bay Area New Music Discussion Group
>> NewMusic at music.mills.edu
>> http://music.mills.edu/mailman/listinfo/newmusic
>>
> _______________________________________________
> Bay Area New Music Discussion Group
> NewMusic at music.mills.edu
> http://music.mills.edu/mailman/listinfo/newmusic

Barry Threw
Media Art and Technology


San Francisco, CA Work: 857-544-3967
Email: bthrew at gmail.com
IM: captogreadmore (AIM)
http:/www.barrythrew.com