Hi, Gavin Kearney et al have presented their work on "Depth perception in interactive virtual acoustic environments using higher order ambisonic soundfields" at the Ambisonics'11 symposium in Paris; the article is available online at http://ambisonics10.ircam.fr/drupal/?q=proceedings/o6
Best, Markus On 17 avr. 2011, at 19:38, Dave Hunt wrote: > Hi, > >> Date: Sun, 17 Apr 2011 09:28:28 +0800 >> From: Junfeng Li <junfeng.li.1...@gmail.com> >> Subject: [Sursound] distance perception in virtual environments >> >> Dear list, >> >> I am now wondering how to subjectively evaluate distance perception in >> virtual environments which might be synthesized using WFS or HOA (high-order >> ambisonics). In my experiments, the sounds were synthesized at different >> distances and presented to listeners for distance discrimination. However, >> the listener cannot easily perceive the difference in distance between these >> sounds. >> >> Anyone can share some ideas or experiences in distance perception >> experiments? or share some references on this issue? >> >> Thank you so much. >> >> Best regards, >> Junfeng > > Change in amplitude with distance should be perceptible fairly easily, but on > its own would just sound the same but quieter, or louder. High frequency > absorption by the air is only really perceptible when the distance is fairly > large, though this effect could be exaggerated for artistic purposes. The > lateness of arrival of sound from distant objects is not directly perceptible > unless there is something visible (e.g. lightning and thunder). > > Reverberation definitely gives perceptible distance effects. More distant > sources are more reverberant. The amplitude of the direct signal should > decrease with distance (inverse square law, or some similar law), while the > amplitude of the reflected and reverberant signal would remain fairly > constant or decrease less rapidly with distance than that of the direct > signal. It is the ratio of direct to reverberant sound that is important. > > John Chowning's 1971 paper "The Simulation of Moving Sound Sources" is a good > early consideration of how to synthesise distance. > > Of course the reported result will depend on the listener, who may not be > used to analysing sound for these effects. > > Ciao, > > Dave > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
