indeed. apologies, it is 90 degrees. On 23 April 2018 at 18:31, Bo-Erik Sandholm <bosses...@gmail.com> wrote:
> As I see it to capture the signals for the upper layers of octomic with a > tetra mic you rotate the mic 90 degrees between the takes.. > To capture the lower octomic elements layer go back to initial position, > then rotate Tetra mic 45 degrees and then 90 degrees for 2 recordings. > > So 4 rotation direction to place the tetra mic elements in same positions > as the 8 Octomic capsules. > > select the 8 A signals that corresponds to the octomic positions... > > Then get our hands on the octomic software if possible and hopefully > translate the tetramic calibration file in to a octomic calibration file, > might be possible. > > This has only a chance to work for IR measurements and if the rotation of > the tetramic is done without moving the center point of the mic head. > > I hope this is possible, it should be a great new use of a tetramic to be > able with a little work to create second order room Impulse responses. > > Bo-Erik > > 2018-04-23 19:10 GMT+02:00 Fernando Lopez-Lezcano < > na...@ccrma.stanford.edu> > : > > > On 04/23/2018 04:24 AM, jack reynolds wrote: > > > >> The new coresound octomic is based on two tetramics, with one rotated 45 > >> degrees from the other, > >> > > > > Hmm, does not look like that to me. If you, for example, take any two > > opposite capsules in the upper ring as part of one tetrahedral > microphone, > > there are no capsules in the lower ring that would match the lower half > of > > that microphone (they are rotated 45 degrees from where they should be). > > > > -- Fernando > > > > > > so if you could work out how the second order > >> B-format is extracted from the octomic array, you could potentially take > >> an > >> A-format reponse with your tetramic, rotate the mic 45 degrees and > capture > >> another, then process all eight channels? > >> Just a thought. > >> > >> Jack > >> > >> On 23 April 2018 at 11:51, Bo-Erik Sandholm <bosses...@gmail.com> > wrote: > >> > >> Have never used Max, I need just 2, but probably 4 sound source > positions > >>> and one listening position. > >>> But the listening position should have full spherical ambisonic > >>> soundfield. > >>> But the result should be ambisonic IR's for these 4 sources. > >>> > >>> The question is could upsampling be used ? > >>> > >>> BR Bo-Erik > >>> > >>> > >>> > >>> 2018-04-23 10:47 GMT+02:00 Hyunkook Lee <h....@hud.ac.uk>: > >>> > >>> Indeed HIRT is the best IR capture package for Max. There is also > HAART, > >>>> which is a standalone Max application we developed using HIRT. This > >>>> software is all in one box for multichannel IR capture (24 mics x 24 > >>>> sources), acoustic parameter analysis and binauralisation. The > analysis > >>>> part is still under development, but the IR capture and > binauralisation > >>>> parts are fully working. You can download it here > >>>> > >>>> http://eprints.hud.ac.uk/id/eprint/24579/ > >>>> > >>>> Also as Pierre mentioned, we captured over 2000 IRs of 39 multichannel > >>>> > >>> mic > >>> > >>>> array configurations from stereo to 9ch 3D using HAART. The library > >>>> comes > >>>> with a Max renderer where you can convolve dry sources or signals fed > >>>> > >>> from > >>> > >>>> DAW with the mic array IRs for simultaneous comparisons between > >>>> > >>> techniques. > >>> > >>>> > >>>> https://github.com/APL-Huddersfield/MAIR-Library-and-Renderer > >>>> > >>>> Best, > >>>> Hyunkook > >>>> ========================================= > >>>> Dr Hyunkook Lee, BMus(Tonmeister), PhD, MAES, FHEA > >>>> Senior Lecturer in Music Technology > >>>> Leader of the Applied Psychoacoustics Laboratory (APL) > >>>> http://www.hud.ac.uk/apl > >>>> http://www.hyunkooklee.com > >>>> Phone: +44 (0)1484 471893 > >>>> Email: h....@hud.ac.uk > >>>> Office: CE 2 /14a > >>>> School of Computing and Engineering > >>>> University of Huddersfield > >>>> Huddersfield > >>>> HD1 3DH > >>>> United Kingdom > >>>> > >>>> ________________________________________ > >>>> From: Sursound [sursound-boun...@music.vt.edu] on behalf of Pierre > >>>> Alexandre Tremblay [tremb...@gmail.com] > >>>> Sent: 23 April 2018 09:29 > >>>> To: Surround Sound discussion group > >>>> Subject: Re: [Sursound] RIR measuring, how to capture a higher order > >>>> Ambisonic room responce? > >>>> > >>>> If you use Max, try the very versatile HIRT. > >>>> > >>>> 2nd order with a tetramic is not possible as far as I am aware > through… > >>>> > >>> we > >>> > >>>> have done (mega)multimic IRs (24 channels of inputs, of which a 1st > >>>> order > >>>> ambisonic) of 3 different spaces with our kit, and it was fun and > >>>> productive to train the ear on difference of multichannel mic > techniques > >>>> (Hyunkook Lee has a cool setup and papers on them, and I was mostly > >>>> interested in DPA LCR omni vs coincident vs MS) > >>>> > >>>> We did many stage positions too. I can investigate if I can share the > >>>> files if that interests anyone. > >>>> > >>>> p > >>>> > >>>> > >>>> On 23 Apr 2018, at 08:37, Bo-Erik Sandholm <bosses...@gmail.com> > >>>>> > >>>> wrote: > >>> > >>>> > >>>>> I want to measure the RIR of a medium size good listening room at > least > >>>>> > >>>> up > >>>> > >>>>> to second order Ambisonic RIR. > >>>>> > >>>>> The IR result is to incorporate the responce and reflections of the > >>>>> speakers and their positions. > >>>>> > >>>>> I have a tetramic. > >>>>> > >>>>> Can several measurements and rotation of the tetra mic between them > be > >>>>> combined to create the measurements that comes closer to a second > order > >>>>> > >>>> mic? > >>>> > >>>>> > >>>>> I know the basics of using Audacity, and a audio sweep and creating a > >>>>> > >>>> IR > >>> > >>>> from this. > >>>>> > >>>>> > >>>>> > >>>>> Bo-Erik Sandholm > >>>>> Stockholm > >>>>> -------------- next part -------------- > >>>>> An HTML attachment was scrubbed... > >>>>> URL: <https://mail.music.vt.edu/mailman/private/sursound/ > >>>>> > >>>> attachments/20180423/ee496094/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. > >>>> University of Huddersfield inspiring tomorrow's professionals. > >>>> [http://marketing.hud.ac.uk/_HOSTED/EmailSig2014/EmailSigFooter.jpg] > >>>> > >>>> This transmission is confidential and may be legally privileged. 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