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. If you >>>> receive it in error, please notify us immediately by e-mail and remove >>>> it >>>> from your system. If the content of this e-mail does not relate to the >>>> business of the University of Huddersfield, then we do not endorse it >>>> and >>>> will accept no liability. >>>> _______________________________________________ >>>> 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/20180423/3de17520/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/20180423/d3bf30df/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.
