Hi Dillon, A further correction, the argument to P is the elevation, and the argument to T should be azimuth, so
N(l, abs(m)) * P(l, abs(m), sin(E)) * T(m, A) Aaron (hel...@ai.sri.com) Menlo Park, CA US On Thu, Jan 14, 2016 at 9:27 AM, Dillon Cower <dco...@google.com> wrote: > Hi Aaron, > > Thanks for pointing that out; just a series of bad (horrible, really!) > typos from transcribing code. :) The equations should be corrected now. > > Dillon > > On Thu, Jan 14, 2016 at 9:13 AM Aaron Heller <hel...@ai.sri.com> wrote: > > > Unfortunately, the definition of the spherical harmonics given in the > > document is wrong. The argument to the associated Legendre polynomial > > should not be multiplied by abs(m). The definition of T is sloppy as > > well. Using the document's notation it should be > > > > N(l, abs(m)) * P(l, abs(m), sin(A)) * T(m, E) > > > > with T(m,x) is sin(-m*x) for m<0, cos(m*x) otherwise. > > > > The way it is specified in the document, m is always positive inside T. > > > > As an exercise in learning SymPy (symbolic python), I've written a > library > > that derives the polynomials for the spherical harmonics in cartesian and > > spherical coordinates. I'll post a link later today. > > > > > > Aaron Heller (hel...@ai.sri.com) > > Menlo Park, CA US > > > > On Thu, Jan 14, 2016 at 5:55 AM, Marc Lavallée <m...@hacklava.net> > wrote: > > > > > > > > It's about time! > > > > > > I made my little effort last year, with an experiment on > > > http://ambisonic.xyz, but I did not updated it since. It gives me hope > > > that ambisonics could become the "de facto" standard for 360 videos, or > > > at least a viable and supported option. This a serious opportunity to > > > promote ambisonics, and the sursound community should help to define > > > the RFC. > > > > > > -- > > > Marc > > > > > > Le Thu, 14 Jan 2016 08:13:51 -0500, > > > Ben Bloomberg <b...@mit.edu> a écrit : > > > > > > > Check it out! > > > > > > > > > > https://github.com/google/spatial-media/blob/master/docs/spatial-audio-rfc.md > > > > > > > > Ben > > > > -------------- next part -------------- > > > > An HTML attachment was scrubbed... > > > > URL: > > > > < > > > > > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20160114/87ecbb68/attachment.html > > > > > > > > _______________________________________________ Sursound mailing list > > > > Sursound@music.vt.edu > > > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > > > > here, edit account or options, view archives and so on. > > > > > > _______________________________________________ > > > Sursound mailing list > > > Sursound@music.vt.edu > > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > here, > > > edit account or options, view archives and so on. > > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20160114/b766886b/attachment.html > > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > > edit account or options, view archives and so on. > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20160114/b559cf74/attachment.html > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160114/17cb9b78/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
