You could mount them on the surface of a rigid sphere (a.la. Eigenmike) with a tetrahedral configuration. Pressure sensors on a rigid spherical baffle have similar characteristics in performance to open sphere cardioid configurations. Without the baffle you will have certain frequencies where the array has little or no output for incident plane waves (corresponding to the nulls of the spherical Bessel functions). This paper has a good explanation and graphs for comparison of different mounting techniques ...
I. Balmages and B. Rafaely, “Open-sphere designs for spherical microphone arrays,” Audio, Speech, and Language Processing, IEEE Transactions on [see also Speech and Audio Processing, IEEE Transactions on], vol. 15, pp. 727 — 732, Feb 2007. Josh On Mon, Jun 20, 2011 at 6:54 AM, Dave Malham <[email protected]> wrote: > > May seem a strange question, but anyone ever had any experience of > building/using a soundfield type mic using omni's? I have been asked by one > of the artists featured on The Morning Line if there's anything he could do > with his collection of 4 DPA's (4060-bm's). Not something I'd ever really > though about before, but as Angelo's B format hydrophone uses omni's ... > (http://www.angelofarina.it/Public/UAM-2011/) > > Dave > > -- > These are my own views and may or may not be shared by my employer > /*********************************************************************/ > /* Dave Malham http://music.york.ac.uk/staff/research/dave-malham/ */ > /* Music Research Centre */ > /* Department of Music "http://music.york.ac.uk/"; */ > /* The University of York Phone 01904 432448 */ > /* Heslington Fax 01904 432450 */ > /* York YO10 5DD */ > /* UK 'Ambisonics - Component Imaging for Audio' */ > /* "http://www.york.ac.uk/inst/mustech/3d_audio/"; */ > /*********************************************************************/ > > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound > -- Joshua Atkins Ph.D. Candidate Dept. Electrical Engineering Johns Hopkins University 3400 North Charles Street Baltimore, Maryland 21218 _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
