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Analysis of ambisonics 5:1 decoders

November 22, 2006

Angelo Farina has done a very instructive analysis of three 2nd order ambisonics decoders for ITU 5:1: * Emigrator by Gerzonic Decopro by Gerzonic and Wigware by Bruce Wiggins leading to the following conclusions:

  • Emigrator employs the Furse coefficients which are plainly wrong.
  • Decopro works reasonably but features constant-directivity virtual microphones with aimings perfectly corresponding to the speaker angles and this is suboptimal in the case of a strongly-irregular loudspeaker array.
  • Wigware is the best one providing spatially-optimized variable-directivity patterns which should provide better reproduction and more uniform surround sound.