On Mon, Sep 15, 2014 at 06:07:57PM +0100, Stefan Schreiber wrote: > Michael Chapman wrote: > > >Was invited to an art gallery over the weekend. > >Some of the 'installations' were sound based : Various objects covered in > >nails, with (?)ceramic (well piezoelectric, anyway) discs fastened on > >them. > You obviously didn't answer to my posting. Nevertheless you seem to > criticize my style.
I really don't thing that Michael's post has anything to do at all with yours... > My observation that few people have used the Eigenmike for music > recordings is still valid, though. (There might be more papers about > the Eigenmike than < public available > music recordings done with > this device. If so, there could be some problems both with the mike > itself and the HOA "production workflow". I know that some people > don't like to hear this, but it is better to stay honest.) I've heard a lot of recordings made with the Eigenmike. Some of the 'soundscape' ones were very nice and impressive, but the music ones I found disappointing without exception. None of them had the right balance, not in musical terms, nor in tonal quality - they all had this quite distinctive coloration that after some listening became rather easy to identify. There can be many reasons for that. The third order AMB signals that can be synthesized from the 32 capsule signals have the problem that you already hinted at: reduced frequency range for the higher orders. It is possible to compensate for this, but that isn't simple and was not done in any of the cases I know of. The 'spatial PCM' format proposed by Farina e.a. as an alternative doesn't solve this, it just sweeps the problem under the carpet and pretends it doesn't exist. This goes quite far: in a paper presented at the recent AES conference on spatial audio it is claimed that the 'spatial PCM' approach can create a second order cardioid using the signals from a tetrahedral mic. But the figure that should be evidence of this shows a first order response. It's also claimed that one can extract sixth order cardioids from an Eigenmike. Maybe that's possible (more by accident than anything else) in some selected directions and between 2 and 3 kHz. But again the figure presented as proof doesn't show this at all. One wonders how this paper passed the peer review. What all this means is that presenting the Eigenmike as part of some established HOA production workflow doesn't correspond to reality. This is not how working HOA is produced. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ 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.
