On Wed, Mar 27, 2019 at 04:50:06AM +0800, Stephen McArdle wrote: > I think the question might be more simpler than this. > For 1st order (with 4 microphones) the very first A to B > equations are (for example):
> W' = FLU+FRD+BLD+BRU > X' = FLU+FRD-BLD-BRU > Y' = FLU-FRD+BLD-BRU > Z' = FLU-FRD-BLD+BRU It's not that simple. This would work if * your capsules are exactly hypercaridiod (i.e. max directivity), independent of frequency, and * they are *perfectly* matched. That is not the case in practice. Even if the capsules are high quality and well matched you will need some EQ in addition to these simple sums. > What would the equations be for 8 microphones? > W' = FLU+FRD+BLD+BRU+FRU+FLD+BLU+BRD > X' = FLU+FRU+FRD+FLD-BLD-BRU-BLU-BRD > Y' = FLU+FLD+BLD+BLU-FRU-FRD-BRD-BRU > Z' = FLU+BRU+FRU+BLU-FLD-BLD-FRD-BRD No, this is completely wrong, ignores all practical aspects, and again it's not that simple. > But what about R’,S’,T’,U’ ?? Much more complex again. In practice you can't do this to sufficient accuracy without rather complex EQ or convolution. And anyway, trying to do A/B conversion (or even Ambisonic decoding) in environments like PureData, SuperCollider and similar is a sure recipe for disaster. These are all *artistic* tools, and they don't allow for the precise technical definition of e.g. the required EQ. Apart from that the probabily of making some simple but fatal error is way too high for a reliable result. Ciao, -- FA _______________________________________________ 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.
