I came to think about a software written by Angelo Farina a long time ago http://pcfarina.eng.unipr.it/Public/B-format/Software/Crux7toBform.exe this is for 7 omni mics, one in the center on a cross created by x y z direction placed omni mic pairs placed the same distance from the center element.
I once saw a working design to create a figure 8 mic by using 2 omni electret elements side by side in the end of 2 , the priciple of Differential Microphone Arrays is described for example here here https://www.spsc.tugraz.at/sites/default/files/Main.pdf It should be workable to create a figure 8 mic signal by taking the differential signal from 2 omni mics, the optimal operation frequency range for this ofcource depends on the distance between the microphones. the central omni mic can possibly be replaced by the sum of all the mirophones? I once speculated that it should be possible to modify this mic setup to work withouth the 7th microphone in the center as this is a central omni - maybe this signal can be created from the sum of all the others? For a horizontal array we could use just 4 microphones :-) I also had the idea that one could create a better working mic by using several omni mics with different distances from the center to optimize the responce for a number of frequenzy bands. I do not know how relewant or workable this is but I think it might be a workable solution if we can produce a software for this. Any reflection on this? apperently it has alredy been done,,, http://lcav.epfl.ch/research/topics/gradient_based_sndfield_acquisition.html https://www.google.se/search?q=differential+microphone+array&biw=1192&bih=463&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj-ipr_-MLJAhVDJHIKHeJGA6kQsAQIUg#imgrc=LCpYmEPkSqx8-M%3A Best Regards Bo-Erik 2015-12-04 19:03 GMT+01:00 Stefan Schreiber <st...@mail.telepac.pt>: > (Ok, I try to improve the look of my posting for the last time. I sent in > plain text format before, even so the sursound list kept on to "reformat" > the text I was seeing on my mail client... Anyway, I hope things work out > this time. Otherwise, I give up... :-D ) > > > Marc Lavallée wrote: > > The upcoming Ozo spherical camera by Nokia with have 8 lens and 8 >> microphones capsules. That's all the specs I found. Will it use >> Ambisonics? >> -- >> Marc >> >> >> >> > > > Well, the specifications of Nokia's VR camera are finally out. > > See for example: > > > http://www.biztekmojo.com/001681/vr-nokia-introduces-ozo-virtual-reality-camera-60000-starts-shipping-q1-2016 > > > Audio: > > ------------------------------------- > > Audio Sensor Type: Omnidirectional, solid state > Audio Area Coverage: Full-spherical, 360 x 360 degrees > Audio Dynamic Range: 64dB S/N, 120dB max SPL > > -------------------------------------- > > These specifications can be seen on Nokia's page, obviously. > > >Will it use > >Ambisonics? > > No. But nevertheless, a camera with full-sphere audio capture.... > > The specs are really very interesting, for several reasons. > > In a private e-mail conversation with a major microphone (and of course > surround) expert, we (or at least I...) came to the conclusion that the > principle on which the Ozo microphone is based could be a supercardioid > 8-channel hedgehog configuration, where 8 capsules (w. supercardioid > response) are positioned at the corners of a cube. (See Ozo pictures, > including openings for the microphone capsules.) > > Similar if not identical: (Schoeps') ORTF-3D microphone. > > > However, Nokia states in the official specifications that the capsules are > "omnidirectional"... > > It could still be that the Ozo case would shield sound "from behind" > (referring to the capsules, of course). > If so (?), you would obtain a "de facto" cardioid 8-channel hedgehog > microphone. > > Or does Ozo introduce a new form of full-spherical microphone?! > > I will keep looking into this. I also believe that Nokia could be a lot > clearer about how the audio part of this < professional > VR camera > actually works. (They righteously insist that immersive audio is a very > important part of any VR experience.) > > > > Best regards, > > Stefan > > P.S.: > > https://www.youtube.com/watch?v=3ZxC2_Lb41k > > > > _______________________________________________ > 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/20151204/2a2cd291/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.
