umashankar, i send my best wishes for the New Year and for your microphone building!
seva On Tue, Jan 3, 2017 at 1:46 AM, umashankar manthravadi < umasha...@hotmail.com> wrote: > Don't call it tetramic. It will upset len Moskowitz. > I use a process developed by Angelo Farina's team, using Matlab scripts. > Initially, I was given permission only to use it, but not share it, but a > few months ago, Angelo said I can forward the scripts to Marc Lavallee, who > is modifying them to run on Octave. Octave is a free program, and these > scripts will be released to public, so it should be possible for anyone who > builds a tetrahedral microphone to calibrate it and generate filtermatrix > files. These files can be used with VVEncode (purchased) or X-volver (free) > to produce B format files. > In the meantime, I am willing to create filtermatrix files for anyone who > wants to do their own measurements. (Fons will also do it, but mostly he > does it for Linux) > You do not need an anechoic chamber. You need a space with the first > reflection atleast 2.5 metres away. A room with a five meter high ceiling > and dimensions of 7.5 meters by 5 meters will be adequate. You can use > Angelo's inverse sine sweep. I will describe my process in detail if you > wish, but I am very happy with the imaging I am getting with Brahma > microphones. The tetrahedral structure printed by Shapeways is very > accurate, and that helps too. > > Umashankar > Don't use sennheiser's generic filters. Their capsules are also 14 mm, but > they are spaced much further apart (mine are almost at the theoretical > minimum). At the AES, the Sennheiser booth was next to Brahma, and many > people compared the imaging of the two. > > Umashankar > > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > From: Bo-Erik Sandholm<mailto:bosses...@gmail.com> > Sent: Tuesday, January 3, 2017 11:29 AM > To: sursound<mailto:sursound@music.vt.edu>; glard...@iol.ie<mailto:glardne > r...@iol.ie> > Subject: Re: [Sursound] [allowed] brahma > > Good luck in your continued effekt. > > By the way, i have accuired one of your Tetra mic 3d shapeway for 14 mm > capsules. > I have not yet assembler it. > I Wonder is there any software package and description on How to create > calibration files for The mic? > I will probably have The possibility to get temporary access to a anechoic > room. > In worst case i Will use the generic calibration from sennheiser :-) > > The mechanical size of The tetraeder is about right. > Bo-Erik > > > > Den 2 jan. 2017 9:01 em skrev "Gerard Lardner" <glard...@iol.ie>: > > > Sorry to hear of the falling-out. I have had some issues with the > > build-quality of my Brahma, which was made by Embrace Video, but > > nevertheless it remains my 'go-to' mic for choral recording. > > > > With best wishes for 2017, and for your ongoing Ambisonic microphone > > projects, > > > > Gerard > > > > > > On 02/01/2017 06:57, umashankar manthravadi wrote: > > > >> This is just an announcement that Nakul Sood and Embrace video will no > >> longer be manufacturing or selling Brahma ambisonic microphones. Our > very > >> informal arrangement has come to an end as Nakul Sood demanded 1)I hand > >> over complete technology and manufacturing protocols, 2) sign a > >> non-disclosure agreement and 3) sign a non-compete agreement. (there > were > >> other demands) I have always worked on Brahma as a shared project, with > >> help from many people and I have no desire to sign a non-disclosure > >> agreement. > >> > >> I had made atleast 20 Brahma microphones before this project began, and > I > >> will continue to make one off brahmas as demanded (I am currently making > >> five second order microphones for Angelo Farina) and I am setting up > fairly > >> high tech processes in Bangalore where I now live (laser cut microphone > >> bodies!) > >> > >> Umashankar > >> > >> > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: <https://mail.music.vt.edu/mailman/private/sursound/attachme > > nts/20170102/572ce57e/attachment.html> > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > 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/20170103/f956a4dd/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > 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/20170103/c84d0caa/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > > -- best seva s...@soundcurrent.com www.soundcurrent.com -------------- next part -------------- An HTML attachment was scrubbed... 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