Ray Rashif wrote: > Good day all > > I've recently gotten interested in recording & mixing in surround, which > led me to Ambisonics as well. I've noticed Fons has a good deal of > contribution to that field, judging from his tools (ambdec et al) and > credits. > > My first stumbling block is how one would go about the mixing process > for such a project, especially since none of our DAWs have (true) > support for surround. Granted, there are ways to work around it, > especially if one doesn't need fancy 360-degree panning UIs. For > instance, although I've not tried it yet, theoretically one can stream > separate tracks to ac3jack. Each track can have its own panning relative > to front and rear groups, and since conventional surround (not > ambisonics) has no height information, that'd be adequate. I don't know > if existing surround VST plug-ins could be used within Ardour properly. > > Secondly, would the tools from http://www.kokkinizita.net/linuxaudio/ be > enough for ambisonics? I notice that there is only a decoder, but for > mixing, one needs an encoder (which I understand to be the panning and > bussing of WXYZ). Is there any native tool to help with that? i've been using ambisonics in ardour quite a lot. check out fons' AMB plugin set (and its README). here is a paper i did on this topic: http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_organ_remix/joern_nettingsmeier-shake_rattle_and_roll.pdf slides: http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_organ_remix/joern_nettingsmeier-shake_rattle_and_roll-slides.pdf and a video from lac 2009: http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_organ_remix/Joern_Nettingsmeier_-_Shake,_Rattle_and_Roll:_An_Attempt_to_create_a_spatially_correct_ambisonic_mixdown_of_a_multi-miked_organ_convert.ogv it's third order, for which the plugins are not yet released, but that should happen rsn. > Third and _most_ important of all, is it possible to listen to the > _virtual_ surround image in real-time through stereo? IIRC, Windows > has/had these neat little utilities provided by vendors to recreate 3D > (virtual) surround with n number of speakers, marketing to the 2-channel > stereo crowd. Any surround audio being streamed by the system would fall > back to this 3D thing if no surround hardware is available. Not sure > whether the same applies for an ASIO environment. If not, I may be > asking for something which has not yet been developed. for any remotely professional application, the only thing that makes any sense is a binaural rendering. which you can do using supercollider or pd, but it's quite an undertaking. > Considering that ALSA has a "plug-in" for downmixing multi-channel > audio, and it works OK, could there be a way to use it/something similar > within a JACK environment? It'd really help when I'm recording live, eg. > an orchestra, with surround miking and no more than just a monitoring > headphone. Something like ac3jack, but with some sort of virtual > surround output option. a little fairy has whispered in my ear that the upcoming release of the AMB plugins may have what you're looking for :-D _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
