Lol, didn't read this one, jinxing with these people. - matt
On Thu, Oct 17, 2013 at 1:43 PM, Aaron Heller <hel...@ai.sri.com> wrote: > Interesting paper in PNAS, from July. I believe it is open access, so > anyone can read/download. Aaron > > http://www.pnas.org/content/110/30/12186.short > > The supplemental information (SI) shows some of the equipment and more > math. > > I. Dokmanić, R. Parhizkar, A. Walther, Y. M. Lu, and M. Vetterli, “Acoustic > echoes reveal room shape,” Proceedings of the National Academy of Sciences, > vol. 101, no. 30, pp. 12186–12191, Jul. 2013. > > > Abstract > > Imagine that you are blindfolded inside an unknown room. You snap your > fingers and listen to the room’s response. Can you hear the shape of the > room? Some people can do it naturally, but can we design computer > algorithms that hear rooms? We show how to compute the shape of a convex > polyhedral room from its response to a known sound, recorded by a few > microphones. Geometric relationships between the arrival times of echoes > enable us to “blindfoldedly” estimate the room geometry. This is achieved > by exploiting the properties of Euclidean distance matrices. Furthermore, > we show that under mild conditions, first-order echoes provide a unique > description of convex polyhedral rooms. Our algorithm starts from the > recorded impulse responses and proceeds by learning the correct assignment > of echoes to walls. In contrast to earlier methods, the proposed algorithm > reconstructs the full 3D geometry of the room from a single sound emission, > and with an arbitrary geometry of the microphone array. As long as the > microphones can hear the echoes, we can position them as we want. Besides > answering a basic question about the inverse problem of room acoustics, our > results find applications in areas such as architectural acoustics, indoor > localization, virtual reality, and audio forensics. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20131017/f7ba1fbb/attachment.html > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20131018/ebcf13bd/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
