Good evening all,
I am a currently looking into Ambisonic periphonic systems.
This is my first post so please go easy on me. I am currently using a 16
speaker rig which includes a cube and an octagon set up. I understand that this
is not a regular shape so is not optimal.
The question i have at the moment is that i am trying to
implement a 2nd order encoder/decoder in Matlab, however at the
moment I am running into problems.
I am using the method described in Hollerwegers paper “Periphonic
Sound Spatialization in Multiuser Virtual Environments” using the SN3D
equations, utilising the pseudo inverse method to derive my decoding matrix. I
currently have a 1st and 3rd order encoder/decoder giving
sensible answers with respect to Gerzons diametric decoder theorem. The problem
with the 2nd order decoder is that the final gains given do not give
negative phase for the diametrically opposed speaker. I have also tried using a
regular shaped speaker set up, but this still does not give me negative phase
in the diametrically opposed speaker.
Could someone tell me where I am going wrong?
Thank you, Paul
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