Hi Archontis et al., Nice work! It’s great someone is taking the time to put together the infrastructure for web-based ambisonics. I enjoyed watching your Intensity Analyzer.
How did you encode the raw Eigenmike signals? Using some of our software (EigenUnits-Encoder or EigenStudio), or something else? We did recently give access to the encoded “Eigenbeams” (spherical harmonics) with the exact intention of making it easier for people to pair em32 recordings with their own ambisonics decoders. There are some subtleties to consider in the encoding process, especially for higher order. In fact, we’ve found that some decoders, specifically for HOA, do present some challenges that can degrade parts of the spatial image and spectral response. There will be a paper presented on this topic at the upcoming AES Sound Field Control conference in Guildford. In the past, we had control of both ends of the signal chain (i.e. the beamforming in EigenStudio), and we could “do the right thing”. Now without knowing a-priori what the decoder is doing it becomes more difficult. This could explain some of the effects discussed earlier in this thread. We will soon be releasing some software updates that will hopefully address some of these issues. So perhaps reserve some judgement for a later date ;-) > An Eigenmike has some aliasing limit frequency You are correct that the Eigenbeams will spatially alias around ~8kHz. We do implement a workaround for traditional beamforming, but for ambisonics applications we just let it alias. There is still usable signal up to (temporal) Nyquist and I’ve heard plenty of material that sounds just fine up there. A future version of the microphone may not have this issue anymore (at least in the audible spectrum)… > It is very hard to obtain or "google" the price of an eigenmike. We are happy to provide this information. Feel free to send a request for a quote via email: cont...@mhacoustics.com <mailto:cont...@mhacoustics.com> > The eigenmike could be a nice tool for VR/AR recordings Absolutely! We think so, too. We’ve actually been pretty busy recently making quite a few recordings (some with video!), and have some great material we are going to share publicly very soon. Hopefully some of it can convince folks about any sound quality issues as well, especially for musical recordings. We will demo some of this also at the Guildford conference. If you are there, please stop by, have a look/listen, and continue to share your feedback. -Steven -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160621/67ae4465/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.
