You can get it here: http://www.ambisonia.com/Members/DrWig/bwphdthesis.pdf/
On Wed, 25 May 2016 16:50:38 +0000 Politis Archontis <archontis.poli...@aalto.fi> wrote: > Thanks a lot Bruce for the pointers, > I will check your work! > > Regards, > Archontis > > On 25 May 2016, at 19:42, Bruce Wiggins > <bruce.wigg...@gmail.com<mailto:bruce.wigg...@gmail.com>> wrote: > > Definately mentioned and looked at in > Wiggins, B. Paterson-Stephens, I., Schillebeeckx, P. (2001) The > analysis of multi-channel sound reproduction algorithms using HRTF > data. 19th International AES Surround Sound Convention, Germany, p. > 111-123. > > Wiggins, B. (2004) An Investigation into the Real-time Manipulation > and Control of Three-dimensional Sound Fields. PhD thesis, University > of Derby, Derby, UK. p. 103 > > See http://www.brucewiggins.co.uk/ for my look at the you tube > implementation which also assumes symmetry...... > > Cheers > > Bruce > > On Wed, 25 May 2016 16:38 Politis Archontis, > <archontis.poli...@aalto.fi<mailto:archontis.poli...@aalto.fi>> wrote: > > Hi, > > There has been some discussion before on B-format or HOA to binaural > filters (HRTF-based), which no matter if it goes through a virtual > decoder or with a direct HRTF-to-Bformat approach, two times the > number of HOA channels of filters are needed (so 8 for B-format, 18 > for 2nd-order HOA, 32 for 3rd-order HOA etc. ). > > Playing around a bit I realized that if the HRTFs are made left-right > symmetric, which makes sense to always force for non-individialized > ones (and also for individualized sometimes), then a smaller set of > filters is needed due to this left-right symmetry. For example for > B-format binaural filters, the W, X and Z channel would have exactly > the same filters, while the Y channel would have the same filter with > a polarity inversion for one ear with respect to the other. Hence 4 > filters instead of 8. > > Thinking about it, it simply makes sense, as the spherical harmonics > are themselves either symmetric or antisymmetric with respect to the > x-z (median) plane. This is also what makes mirroring of a HOA sound > scene from left to right for example, as easy as inverting certain > HOA channels. > > My question to any of the decoder developers on the list is if you > have seen that anywhere analyzed or mentioned in the context of > binaural decoding?? > > Many thanks, > Archontis Politis > > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20160525/a7b7b617/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/20160525/f793cacf/attachment.html> > _______________________________________________ Sursound mailing list > Sursound@music.vt.edu<mailto: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/20160525/e9cb0744/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.
