[NewMusic] Core Sound ambisonic mics

[cliff caruthers]

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
>