On Sun, Jan 11, 2009 at 01:57:55PM +0100, Fons Adriaensen wrote: [...] > On a first mathematical level, you can see this as a sort > of 'spectral' representation. Any cyclic function can be > Fourier transformed into a set of harmonic frequencies, > each having its level and phase. In similar way, the > horizontal distribution of sound directions is a cyclic > function, not of time but of the horizontal angle (azimuth) > of the sources, and you can apply the same Fourier transform > to it, which is how horizontal AMB works. The 'order' of an > AMB system refers to how many 'harmonics' are used. > For a periphonic (3D) sound distribution the 'function on > a circle' becomes a 'function on the sphere', depending on > two variables, azimuth and elevation. Because a sphere is > not the same as a 2D hyperplane the corresponding spectral > transform is not the 2D FT, but is defined by the set of > 'spherical harmonics'. And here of course the more difficult > maths start... Man, you are my idol. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
