I will be in contact after I am back from my Thailand holiday. But even then I will have to concentrate a few Days in getting a headtracker sensor to talk bluetooth.
Bo-Erik Den 6 jan. 2017 8:55 fm skrev "David McGriffy" <da...@mcgriffy.com>: > I recently developed a MatLab script to create calibrations based on > Angelo's method. Set up equations for each measurement's expected results, > find the LMS solution in each frequency bin, then build the resulting > filter matrix. A little engineering around the low and high frequencies > and it seems to work pretty well. > > I'd also like to point out that VVEncode (alas not VVTetraVST or VVMic) > will process anyone's 4x4 matrix of filters if they are put in wav files > like Angelo and Brahma do. I also have matrix calibration processing in my > command line tool and I've done it in pure MatLab. Contact me if you want > to try this and have any questions. > > I mention all this mostly because I'd be interesting in processing anyone's > custom measurements. For me this is test data for my scripts. So far I've > only run data out of one lab and with one type of > excitation/reference/etc. I'd like to make sure I'm not dependent on those > things. And I can return a working calibration, I hope. > > David > VVAudio > > On Thu, Jan 5, 2017 at 1:21 PM, Fernando Lopez-Lezcano < > na...@ccrma.stanford.edu> wrote: > > > On 01/05/2017 02:19 AM, umashankar manthravadi wrote: > > > >> I use an earthworks calibration microphone, but any good quality six mm > >> Omni microphone will be okay. Noise is not important, but flat frequency > >> response is. You could use a tetramic and take the W signal after > >> processing, but it might be overcomplicating things. Coaxial speakers > sound > >> ideal, but many of them have problems. A small five inch full range, or > 5 > >> inch plus tweeter mounted close together, is best. I use an Adam 5 after > >> first sealing off the bass port. Choice of microphone is more important > >> than the speaker. > >> > > > > Indeed. I have an (if memory serves) emm6 "reference microphone" which is > > not very expensive but comes with its own calibration curve. Flatness is > > important as that will define how true is the frequency response of the > > calibration. For the excitation I use a single driver small speaker, so > far > > it has been fine. I record is our rather small concert hall (the Stage) > and > > I managed to get about 5 mSecs of useful data before the first reflection > > arrives. That seems to be enough. Completely agree with sealing the bass > > port if you have one like that, that's what Eric Benjamin recommended > doing. > > > > I'll probably be offline for a few days, sorry (vacation, no internet, > > bliss)... > > Good luck! > > -- Fernando > > > > > > > > Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for > >> Windows 10 > >> > >> From: Bo-Erik Sandholm<mailto:bosses...@gmail.com> > >> Sent: Thursday, January 5, 2017 3:31 PM > >> To: sursound<mailto:sursound@music.vt.edu> > >> Subject: Re: [Sursound] [allowed] brahma > >> > >> To get a good calibration, I expect I will need at least one > >> known/reference source or sensor? > >> > >> The reference for me will probably be my coresound Tetramic. > >> > >> I will probably use Kef eggs as speakers as they are coaxial > transducers. > >> Only at low frequency will The port be offerter. > >> > >> Have I understood The basics? > >> I will probably measure outside a calibration Day orborrow a anechoic > room > >> at swedish radio. > >> > >> Bo-Erik > >> > >> Den 5 jan. 2017 11:53 fm skrev "umashankar manthravadi" < > >> umasha...@hotmail.com>: > >> > >> Dear fernando > >>> > >>> > >>> > >>> I forwarded your link to marc Lavallée when you first posted them. My > >>> intent is that we should have multiple compatible systems for > >>> calibrating A > >>> format mics > >>> > >>> > >>> > >>> Sent from my Windows 10 phone > >>> > >>> > >>> > >>> From: Fernando Lopez-Lezcano<mailto:na...@ccrma.stanford.edu> > >>> Sent: 05 January 2017 00:28 > >>> To: Surround Sound discussion group<mailto:sursound@music.vt.edu>; > >>> glard...@iol.ie<mailto:glard...@iol.ie> > >>> Subject: Re: [Sursound] [allowed] brahma > >>> > >>> > >>> > >>> On 01/02/2017 09:59 PM, Bo-Erik Sandholm wrote: > >>> > >>>> 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. > >>>> > >>> > >>> Hi Bo-Erik, > >>> You could take a look at my project here (I posted about this a while > >>> back): > >>> > >>> https://cm-gitlab.stanford.edu/ambisonics/SpHEAR/ > >>> (there is mailing list with 0 posts so far, ha ha..) > >>> > >>> See paper here (been working on this for over a year): > >>> https://ccrma.stanford.edu/~nando/publications/sphear.pdf > >>> > >>> The project includes free software (open source, GPL) that runs in > >>> Matlab and derives a calibration matrix (4x4 matrix of FIR filters) > that > >>> can be used directly with TetraProc (by Fons Adriansen) - or any other > >>> software that can run the filters. > >>> > >>> Just a few days ago I _finally_ managed to get the software into > >>> somewhat usable shape in that I think (and I'm pretty much wrong every > >>> time I say this, so...) it is working correctly. The calibration relies > >>> on having 16 measurements (could be 8) in the horizontal plane around > >>> the Ambisonics microphone plus one more of a calibration microphone in > >>> the same exact location. Aliki is used to capture the IRs and edit > (trim > >>> and window) them. DRC (Digital Room Correction) is used to equalize the > >>> excitation speaker. Then the software I wrote processes those IRs and > >>> outputs a 4x4 matrix of filters. Many parameters can be tuned. I'll > post > >>> a couple of pictures later... > >>> > >>> Documentation (surprise!) is mostly lacking. I hope to remedy that > >>> somewhat soon (at least a list of the sequence of octave function calls > >>> you need to get the job done). > >>> > >>> My latest prototype with 10mm capsules was hastily measured before I > >>> left for "vacation" and the plotted results of the calibration are > >>> looking good. A re-calibration with the latest software of my first > >>> prototype which captured a full concert also sounds fairly decent. > >>> > >>> Anyway, > >>> Good luck! > >>> -- Fernando > >>> > >>> > >>> > >>> 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. > >>> > >>>> > >>>> > >>> _______________________________________________ > >>> 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/20170105/7f2afed4/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/attachme > >> nts/20170105/3d4d92e6/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/attachme > >> nts/20170105/006695a8/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. > >> > >> > > _______________________________________________ > > 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/20170105/9173910c/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... 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