Octathingy is probably 2 Tetra mics joined so we have Front Left Up, front left down, front right up, front right down Back Left Up, Back Left Down, Back Right Up, Back Right Down.
I think it can be called a second order mic, i believe it was presented at aes a few years ago... It is designed by 2 of our veterans from sursound, but my memory fails me at this moment ,:-) Bo-Erik On 17 Sep 2016 19:56, "Stefan Schreiber" <[email protected]> wrote: > Fernando Lopez-Lezcano wrote: > > Hi all, >> >> I've been working on this project since November 2015, and at the time I >> thought I would be done by Christmas, hence the subject line... (I was very >> naive). The main motivation of the project was to have easy to build and >> cheap microphone arrays for my students to use in class (@ CCRMA, >> Stanford)... >> >> So, you can choose what you can use this for: Ambisonics themed Xmas tree >> ornaments, 3d puzzles of platonic solids, big earrings for your loved ones >> or, perhaps, microphone arrays. >> >> I've been working on designs that are 3D printable as flat pieces on >> cheap or medium priced printers and are assembled and glued together like >> 3d puzzles, starting with a regular tetrahedral first order microphone and >> then moving on to Eric Benjamin and Aaron Heller's Octathingy (8 capsules) >> and a few more "platonic solid" designs (12 and 20 capsules, these last >> just to test the concept of even bigger 3d puzzles - it works). >> > > > It is a bit frustrating to read about (probably) interesting projects > which are< completely unintroduced >. > > https://ccrma.stanford.edu/search/node/Octathingy > > Didn't find any real info. Is this supposed to be some 2D design? If so, > Orange Research Labs also had some prototype, and also some 12-capsule (2nd > order-3D) prototype but which seems to be to big. (Capsule distances on > sphere implied an spatial aliasing limit of about 4.5kHz, which would be > (too) low for any serious recording.) > > So, < before > talking about 3D printed holders: What actually IS an > 8-capsule Octathingy? > > Waiting for some enlightening infos... :-) > > Best > > Stefan > > > >> All models are written in Openscad (a 3d modeling programming language), >> with most of the dimensions being parametric - the models are, after all, >> just software. >> > > What does this mean? "Parametric dimensions" for some 3D printer??? > > I spent a couple of weeks doing plain old geometry on paper to try to get >> everything to fit just right... >> >> I wrote a paper on the progress of the project so far for AES SFC (which >> I regretfully was unable to attend), you can find it for now in my web page >> - jump to the publications link[*]. I have a first working prototype >> (calibration and measurements in the paper), I'm currently working on two >> more and looking forward to testing the 8 capsule design. >> >> A lot of work ahead (coding and hardware design, documentation, etc). >> This turned out of be a black hole for any time I can throw at it. >> Contributions welcome... >> >> GPL Openscad code and Creative Commons licensed 3D models are available >> here: >> >> https://cm-gitlab.stanford.edu/ambisonics/SpHEAR/ >> >> (there is also a low volume mailing list available, so far 0 messages :-) >> >> You can also find a Kicad PCB design for the phantom power interface for >> each capsule (they fit into the body of the latest design) and the >> preliminary calibration software (GPL, written in Octave) for the >> tetrahedral design. But of course everything needs better documentation. >> Take a look, I included a few more pictures... >> >> If you are tempted to build one be forewarned that it is a LOT of work :-) >> >> Many in this list helped a lot (you know who you are, thanks!!), I would >> not have gotten this far by walking alone. >> >> Enjoy! >> -- Fernando >> >> [*] https://ccrma.stanford.edu/~nando/ >> >> -------------- next part -------------- >> A non-text attachment was scrubbed... >> Name: TinySpHEAR_zapnspark.png >> Type: image/png >> Size: 2450318 bytes >> Desc: not available >> URL: <https://mail.music.vt.edu/mailman/private/sursound/attachme >> nts/20160914/a9f50b92/attachment.png> >> _______________________________________________ >> Sursound mailing list >> [email protected] >> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, >> edit account or options, view archives and so on. >> >> > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160917/955dba31/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
