Hi Bo-Erik, if you use Matlab or Octave, you could also try the SDM method to upsample from first-order RIRs to 2nd, 3rd, or any order you want basically. SDM stands for the Spatial Decomposition Method from my colleague Sakari Tervo, which has been used quite a lot for auralization and visualization of spatial room IRs. You can find the toolbox available online.
HARPEX could potentially do it too, but since it is made for reproduction/playback and most likely block processing, I don’t know if it would cope well with the fine temporal structure of the RIR. Regards, Archontis Politis On 23 Apr 2018, at 14:25, jack reynolds <jackreynolds...@gmail.com<mailto:jackreynolds...@gmail.com>> wrote: or yes, take a first order B-Format IR and upsample using Harpex is another possibility. J On 23 April 2018 at 12:24, jack reynolds <jackreynolds...@gmail.com<mailto:jackreynolds...@gmail.com>> wrote: The new coresound octomic is based on two tetramics, with one rotated 45 degrees from the other, 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<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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. 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