"Tom Jordaan" <sen...@gmail.com> wrote: > On Tue, 12 Jul 2011 01:56:08 +0100, Stefan Schreiber > <st...@mail.telepac.pt> wrote: >> The minimum for surround with height is 8 speakers, for Ambisonics 1st >> order. If the sphere is full-sphere (and not half-sphere), you probably >> need 12+ speakers, although I suspect there could be a solution with >> less speakers than 12. (Feeback welcome...) >> >> Some have tried to reproduce "some" height information via a 7.1 layout. >> (And even 5.1, but here there are severe limitations.) > > Can anyone shed further light on the usefulness of the 3D 7.1 layout that > Richard Furse's player offers? Possibly only a segment of a sphere, rather > than full sphere, but is it useful *enough*?
The minimum for Ambisonic surround with height is 6 speakers. This is according to: M.A. Gerzon, "Periphony: With-Height Sound Reproduction", J. Audio Eng. Soc., vol. 21, pp. 2-10 (1973 Jan./Feb.) (A highly mathematical account of general with-height reproduction systems. Includes the fundamental theory of with-height directional encoding systems). The speakers are placed on the faces of a cube, or at the vertices of an octahedron (depending on how you choose to think about these things). Simon Goodwin's 3D7.1 is just such a full-sphere layout (with the addition of a seventh centre-front speaker at head height). I have never used 3D7.1, so cannot comment on its usefulness. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
