[Sursound] Spherical microphone array
Hello all. I was wondering what people thought of the usefulness of a 10cm diameter spherical microphone array with 1000 mems detectors. (I'm Thinking of using ADMP621s) I know that this has a kr of about 3.2 but with the large number of microphones I was thinking it might be possible to get a 4th order result without significant spatial aliasing. Especially if The pattern was chosen to minimise spatial aliasing. In order to complement this I was thinking of increasing the frequency response al lower frequencies with a second, open spherical array ala the work of the university of sydney. Do you think that this would be a worthwhile exercise. -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20131019/20ce7a44/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
[Sursound] curiosities
Hi, I've never really heard anything in ambisonics or wfs. I'm saving up money for speakers currently. I'm ultimately interested in helping to build audio tools/environments for virtual reality (http://www.oculusvr.com/ + http://sixense.com/hardware/wireless = tools to help build localization programs +3d visualizers, etc). If anyone liked to help, let me know. I'm stuck on Phase 1 for a bit because of funds. Anyways, is the movement of the microphone interesting to hear? Like walking forward or if you're holding doing baton movements with it or something. Because you're not moving when you're listening to it (it creates an interesting effect in VR visually can even cause nausea if you're moving around too much or at least it did for me). I think ultimately I'm wanting to know how movement (of sound the microphone too) space could be used to create new kinds of music. Can you make a synth that snakes around in the air (can the sound be localized that precisely?) Could percussive elements sound like they were orbiting each other, etc? What kinds of hardware does it to take to be able to hear that? -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20131018/d689d430/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Acoustic echoes reveal room shape
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
