Hi Anna, While there's no denying that the Zylia microphone array is a great value proposition, it is perhaps a bit misleading to market it based on the statement: "spatial resolution is not significantly improved from the 3rd to 4th Ambisonics orders."; as this is not the full story in this case.
Speaking from a purely "spatial performance" point-of-view, if one were to employ the objective metrics described in [1], they would find that the approximate (in this case, also theoretical) usable frequency ranges per order are: Zylia mic: 3rd order range: ~1600-2900Hz 2nd order range: ~700-3000Hz 1st order range: ~100-3100Hz 0th order range: -3200Hz Eigenmike32: 4th order range: ~3000-5500Hz 3rd order range: ~1600-6000Hz 2nd order range: ~700-7000Hz 1st order range: ~100-8000Hz 0th order range: -8500Hz Note that this is also considering a very generous maximum permitted sensor noise amplification limit, so expect those low-frequency roll-offs to be more severe for classical music performance, and nature recordings etc. depending on sensor noise. I also pulled these values quickly by eye, based on the "Analyse" graphs given by the sparta_array2sh VST plugin, so they are only approximate, and should be treated as such. However, I believe they still provide sufficient insight to support my claim that "not all HOA mics are made equally". The frequency range at which you actually get these higher-order components is of significance. (This is also even before you start to consider the quality of the sensors and how they affect the reproduction fidelity). Best, Leo [1] Moreau, S., Daniel, J. and Bertet, S., 2006, May. 3D sound field recording with higher order ambisonics–Objective measurements and validation of a 4th order spherical microphone. In 120th Convention of the AES (pp. 20-23). P.S. it's also interesting to note that: should a recording engineer truncate and only use the FOA signals anyway (many decoders are still FOA only after-all), then they would have actually obtained better 0th and 1st order components from a traditional A-format mic, compared with the Zylia array. P.S.2. I don't believe the Zylia encoder has any near-field compensation options? Please correct me if I'm wrong, but if it is operating under far-field assumptions, then I suspect those assumptions were violated during the linked recording. ________________________________ From: Sursound <sursound-boun...@music.vt.edu> on behalf of anna.czerwoniec zylia.pl <anna.czerwon...@zylia.pl> Sent: 16 June 2020 14:22:57 To: Surround Sound discussion group; Jens Ahrens Subject: Re: [Sursound] Binaural rendering of an Eigenmike recording Hi All! Just to let you know, with the ZYLIA ZM-1 you are able to obtain similar results with 3rd order Ambisonics and at much lower cost. You just require the ZM-1 microphone and the ZYLIA Ambisonics Converter with a binaural decoder and then you will be able to assign the rotation and elevation of the microphone to the head-tracker using OSC in your DAW. Even though the Eigenmic is a 4th Ambisonics Order microphone, it is proven that the spatial resolution is not significantly improved from the 3rd to 4th Ambisonics orders. You can check this remake of a famous binaural audio recording https://soundcloud.com/user-309532711/barber-shop-adam-szulc-binaural-recording-asmr-zylia All the best, Anna > 21 maja 2020 18:03 Jens Ahrens <jens.ahr...@chalmers.se> napisał(a): > > > Hello everyone, > > … and another post from me. > > Here’s a quick 2-min video of what binaural rendering of an Eigenmike > recording can sound like for those of you who haven’t heard this before: > https://youtu.be/qcqeygqjxZ4 It’s 4th order rendered directly in the > spherical harmonic domain (without a virtual discrete loudspeaker array). The > rendering was done with ReTiSAR > (https://github.com/AppliedAcousticsChalmers/ReTiSAR), which is generously > funded by Facebook Reality Labs. > > Best regards, > Jens > > -- > Jens Ahrens > Associate Professor > Division of Applied Acoustics > Chalmers University of Technology > 41296 Gothenburg > Sweden > +46 (0)31 772 2210 > http://www.ta.chalmers.se/people/jens-ahrens/ > > _______________________________________________ > 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. Anna Czerwoniec, PhD Marketing & Sales Director Zylia Sp z o.o. Uniwersytetu Poznańskiego 2, 61 – 614 Poznań, Poland Phone 0048 61 279 40 44, www.zylia.co<http://www.zylia.co> (http://www.zylia.co) https://www.facebook.com/zylia/ https://twitter.com/ZYLIA_co https://www.instagram.com/zylia.co/ Record audio like never before _______________________________________________ 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/20200616/07ef2857/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.
