> Hi Michael, > thanks for the reply - there is no doubt Ive missed something ! > I am aware of the need for W coordinate and have included it in my encoder > as instructed although I have to admit I am still not clear on its > function - but my question specifically relates to the information gained > from the 3 fig of eight patterns gained form a mic design such as this one : > > http://www.shapeways.com/model/143678/velan-140-internals.html > > Am I right in thinking the W component gives you enhanced distance > information for a given sound source ?
thansk again for your patience, Gus > > > > > > > On 26 May 2012 15:08, Michael Chapman <[email protected]> wrote: > >> > I think I may be having a microphone epiphany or at least what smug >> > boffins >> > might call "an intuitive understanding" but please feel free to correct >> > any >> > errors in my thinking. In using a six capsule (or 3 capsule) microphone >> > setup with 3 figure of eight pairs this gives you localisation >> information >> > based on the pressure gradient between each of these pairs (given by the >> > antiphase ?) . This pressure gradient gives you the localisation of the >> > sound on any of the given axis (X,Y,Z) and with this information you can >> > get the localisation of the sound in a sphere ? Is this correct , or >> even >> > vaguely correct ? >> > >> >> I won't comment in details as either >> -you've missed something, or >> -I have misunderstood. >> >> If you have three ribbon microphones (one on each axis), or >> some other 'figure of eight' microphones, you will never >> get ambisonics. >> >> Just as two (what is, in fact, Blumlein stereo) will never give >> you 2-D / pantophonic ambisonics. >> >> You need the zero-order component ('W') as well. >> >> Two figure of eights and an omni will give you X,Y and from the >> omni: W. >> But obviously trying to put all that lot in the same spot in space at >> the same time has led to simpler approaches ;-)> >> >> You need the sum, as well as the differences ... >> >> Michael >> >> >> _______________________________________________ >> Sursound mailing list >> [email protected] >> https://mail.music.vt.edu/mailman/listinfo/sursound >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20120526/71cc82bc/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
