> �David Pickett <d...@fugato.com>�wrote: > > > >>> How does one record in third order (or indeed any order above first >>> order)?�� >>> What kind of microphone array does one need, for instance, for 3rd >>> order with no height information (WXYUVPQ)?� >>> Is there a "native format" method for HOA or is it all extended A >>> format, with conversion through matrices? >
I don't dispute Eric's very short, but very full summary but I think we may be at cross purposes. Richard Furse's software obviously works with a higher order microphone (if anyone has one) but I would suggest his primary motivation was for synthesised higher order soundfields. You can obviously create a synthetic soundfield of any order you want. Michael > > All excellent questions. �It is not quite as obvious how to record any > order of Ambisonics above first order. �It will require some sort of > microphone array and post-processing. �One of my favorites is the array > described by Craven, Lawe and Travis in: > Microphone arrays using tangential velocity sensors > P.G. Craven, C. Travis, M.J. Law > We introduce a new class of 3D microphone arrays that use symmetrical > arrangements of tangential velocity sensors.� Use of velocity sensors > allows these arrays to recover spherical harmonics of a given degree with > less low-frequency boost than when using pressure sensors only.� As an > example we present a symmetrical array of twelve velocity sensors that > resolves the eight harmonics of degrees 1 and 2.� A second-order spherical > microphone can now be constructed by combining this array with one or more > pressure sensors that provide the missing harmonic of degree 0. > http://ambisonics.iem.at/symposium2009/proceedings/ambisym09-craventravis-tangentialsphmic.pdf/at_download/file > > > The other practical method for constructing an array that produces higher > order spherical harmonic outputs is to use a group of omnidirectional > microphones on a sphere, such as the commercially available Eigenmike: > http://www.mhacoustics.com/products > > > There are other methods. �It's still early days for this technology. > > Eric Benjamin > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20131122/1436acf9/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
