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.
