Hi Albert, Thanks for the feedback!
> On 21 Jun 2016, at 07:38, Albert Leusink <alb...@tumbleandyaw.com> wrote: > > Well done Archontis!. I was hoping this could be possible, somebody just had > to put the work into it...thanks so much for this. > > The examples are (sort of) working for me but sound very low res and dull. > > When I switch between 1,2,3 and 4th order in the HOA decoder, it seems that > each time when you increase the order, it extends the frequency range > upwards by half an octave… The low-pass effect at the moment is the effect of order truncation. HRTFs at higher frequencies have too much directional variability, and that means that these high-frequencies are reflected to the higher-order filters. Dropping the HO generates the low-pass effect. Note that this is also due to the basic implementation of the decoding filter examples. You can correct (on average) this high-frequency loss in a systematic way, and generally you can improve the colouration by tuning the decoder, which is something that these filters do not have. You cannot correct however the spatial spreading or blurring of the lower orders (or decreased externalization and elevation effects). The idea of the examples was to show that you can include your own decoding HRTF-based filters. If somebody has their own optimized binaural decoding filters, I can provide the same examples with their own filters (or gradually write some proper documentation). If filters are not provided, then the decoder just creates two opposing cardioids, which have much less colouration (and worse binaural effects) - I’ll try to add this mode on the examples too for comparison. > > Most of the first order samples reproduce nothing above 10k and a lot of > them sound severely saturated/clipped. Hm, that seems to be my mistake, I noticed it too at some other browser recently. I think it’s due to having normalized the decoding filters to peak unity, which may result in clipped output after all processing. I’ll check it when I can. > > You note on your Github that you used an Eigenmike for the recordings, could > this be the issue? I've never heard anything musical sounding coming out of > that microphone, of course the localization is stellar....but it seems to get > duller and duller the more orders you truncate In a sense the Eigenmike provides a much better first-order B-format. Using proper encoding filters the range of the dipoles and omni are close to the ideal ones for up to ~9kHz, for the Soundfield the patterns start to deviate from ideal at lower frequencies. But you are right, I also haven’t managed to get from the Eigenmike the great sound quality I’ve heard from Soundfield recordings. Regards, Archontis _______________________________________________ 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.
