> -----Original Message----- > From: Fons Adriaensen [mailto:fons@xxxxxxxxxxxxxx] > Sent: Tuesday, December 17, 2013 11:04 AM > To: Ivica Bukvic > Cc: A list for linux audio users > Subject: Re: question about FOSS WFS implentations > > On Tue, Dec 17, 2013 at 10:14:45AM -0500, Ivica Bukvic wrote: > > > I had an opportunity to listen to their system and even though it was quite > > sparse it still delivered a very compelling image even close to the > > speakers. If the system was using anything in the way of ambisonics it > > would have done so only using the actual horizontal array. Given that > > highest repreducible frequency is directly related to the distance between > > the speakers I am wondering if this may be because they are also trying to > > render waves from virtual speakers as they propagate through the real > > speakers as well as using a selection of speakers to render certain sounds > > as per recent publications in this area. > > 'Filling the gaps' with virtual speakers doesn't change things - for the > same reason that you can't pull yourself up by your bootstraps. > > Consider the simple case of a plane wave from a direction orthogonal > to the line of speakers. All speakers will get the same signal. To > create a virtual speaker between every two adjacent real ones, those > two would just have to get more of the same signal. So nothing changes, > except at the ends of the line (and you may rediscover tapering). What if the denser line is positioned a distance behind the original speakers (as in the entire space is actually bigger with a denser array encircling the real physical array)? Sure, this would do nothing for an orthogonal direction, but it may improve the perception of other angles, no? > > Ambisonic reproduction will create images 'projected on the line of > speakers' a virtual source in between the speakers will appear at > the same distance as the real speakers. It's possible to change this > using near-field compensation, but only for low frequencies. > > Distance illusions can be created by exploiting psycho-acoustic > effects rather than physics. I suspect systems such as S.E. are > particularly good at this. > > Ciao, > > -- > FA > > A world of exhaustive, reliable metadata would be an utopia. > It's also a pipe-dream, founded on self-delusion, nerd hubris > and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
