Of course, the other way is to attach a small, high power speaker to a trained fly....
Dr Peter Lennox School of Technology University of Derby, UK tel: 01332 593155 e: p.len...@derby.ac.uk -----Original Message----- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of Augustine Leudar Sent: 30 May 2012 15:18 To: Surround Sound discussion group Subject: Re: [Sursound] Chasing flies with ambisoinics? Wow - thats real startrek material right there Dave ! I was letting my imagination wander in a similar area the other day and was wondering if the beating/harmonics caused by two beams of electromagnetic waves could somehow excite the air where their paths crossed causing a sound to eminate from that spot. Although it may sound a bit out there I found out from a PHD student that there some Russians doing something vaguely similar already except they are doing it the other way round - using ultrasound propogated in a liquid to create light : http://www.myspace.com/video/12k-line/evelina-domnitch-dmitry-gelfand-quot-xenon-wind-quot-camera-lucida-dvd/7806818 On 30/05/2012, Dave Malham <dave.mal...@york.ac.uk> wrote: > One thing to bear in mind is that the perception of proximity is far easier > to achieve with (fairly > rapidly) moving sources. If you get the changing patterns of simulated > early reflections right, the > ear/brain will focus on the consistent cues (early reflections) and tend to > ignore the inconsistent > ones like the direct to reverb ratio. Unfortunately, once the sound stops > moving, the direct to > reverb ratio becomes more consistent, so.... > > However, with any loudspeaker based system, you are continually battling > against the loudspeaker > radius (a.k.a. "reverberation radius" or "critical distance") problem - that > is, the sound from a > loudspeaker (or loudspeakers) always tries to sound like it is coming from > not less than the > distance of the loudspeaker, simply because (one of) the strongest distance > cue is the ratio of > direct to reverberant sound. It's easier if you have a very dead room and > the soundscape you are > trying to reproduce has noticeably more reverberation, since you can then > get the > direct-to-reverberant ratio more closely right. Not that it's easier with > WFS or HOA to get some of > the other cues right, such as wavefront curvature and this helps greatly - > but is not a panacea. > There are only two ways (at present) that I am aware of in which you can, > even theoretically, do it > - short of physically having moving loudspeakers. The first is individually > headtracked binaural > synthesis over headphones, the other is the use of steerable spots of sound > produced by crossing, > modulated ultrasonic beams - a bit like Holophonics > <http://www.holosonics.com/> Acoustic Spotlights > but with more widely spread transducers, so that the demodulation only > occurs where the beams cross. > > Dave > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound _____________________________________________________________________ The University of Derby has a published policy regarding email and reserves the right to monitor email traffic. If you believe this email was sent to you in error, please notify the sender and delete this email. Please direct any concerns to info...@derby.ac.uk. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
