Hi, As far as I know you cannot simply obtain 2nd order channels from two sets of 1st order channels. A look at a visual representation of the spherical harmonics indicates that this is far from trivial.
https://brilliant.org/wiki/spherical-harmonics/ The SDM suggested by Archiontis, or Harpex may well use fairly complex mathematics to approximate a reasonable up-sample. Ciao, Dave Hunt On 23 Apr 2018, at 17:00, sursound-requ...@music.vt.edu wrote: > From: Politis Archontis <archontis.poli...@aalto.fi> > Subject: Re: [Sursound] RIR measuring, how to capture a higher order > Ambisonic room responce? > Date: 23 April 2018 12:36:45 BST > To: Surround Sound discussion group <sursound@music.vt.edu> > > > Hi Bo-Erik, > > if you use Matlab or Octave, you could also try the SDM method to upsample > from first-order RIRs to 2nd, 3rd, or any order you want basically. SDM > stands for the Spatial Decomposition Method from my colleague Sakari Tervo, > which has been used quite a lot for auralization and visualization of spatial > room IRs. You can find the toolbox available online. > > HARPEX could potentially do it too, but since it is made for > reproduction/playback and most likely block processing, I don’t know if it > would cope well with the fine temporal structure of the RIR. > > Regards, > Archontis Politis _______________________________________________ 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.
