Ambisonic Channels Sequence
October 2008: The proposal documented here has engendered wide support. It is though intended for future ambisonic files (etc.).
Pre-2009 files typically used a channel sequence of WXYZRSTUVKLMNOPQ (the table below can be used as a concordance), and FuMa channel weightings (conversion factors are on the pages for channels 0 to 15).
The current most favoured proposal for ambisonic channel sequence seems to be to define an ambisonic channel number (ACN), such that:
ACN = l * ( l + 1 ) + m
Click on an ACN (blue-number) for full details about that channel.
Ambisonics Channel number and formulas
ACN | (l,m) | letter code |
|---|---|---|
(0,0) | W | |
(1,-1) | Y | |
(1,0) | Z | |
(1,1) | X | |
(2,-2) | V | |
(2,-1) | T | |
(2,0) | R | |
(2,1) | S | |
(2,2) | U | |
(3,-3) | Q | |
(3,-2) | O | |
(3,-1) | M | |
(3,0) | K | |
(3,1) | L | |
(3,2) | N | |
(3,3) | P | |
(4,-4) | ||
(4,-3) | ||
(4,-2) | ||
(4,-1) | ||
(4,0) | ||
(4,1) | ||
(4,2) | ||
(4,3) | ||
(4,4) | ||
(5,-5) | ||
(5,-4) | ||
(5,-3) | ||
(5,-2) | ||
(5,-1) | ||
(5,0) | ||
(5,1) | ||
(5,2) | ||
(5,3) | ||
(5,4) | ||
(5,5) | ||
(6,-6) | ||
(6,-5) | ||
(6,-4) | ||
(6,-3) | ||
(6,-2) | ||
(6,-1) | ||
(6,0) | ||
(6,1) | ||
(6,2) | ||
(6,3) | ||
(6,4) | ||
(6,5) | ||
(6,6) | ||
(7,-7) | ||
(7,-6) | ||
(7,-5) | ||
(7,-4) | ||
(7,-3) | ||
(7,-2) | ||
(7,-1) | ||
(7,0) | ||
(7,1) | ||
(7,2) | ||
(7,3) | ||
(7,4) | ||
(7,5) | ||
(7,6) | ||
(7,7) | ||
(8,-8) | ||
(8,-7) | ||
(8,-6) | ||
(8,-5) | ||
(8,-4) | ||
(8,-3) | ||
(8,-2) | ||
(8,-1) | ||
(8,0) | ||
(8,1) | ||
(8,2) | ||
(8,3) | ||
(8,4) | ||
(8,5) | ||
(8,6) | ||
(8,7) | ||
(8,8) | ||
(9,-9) | ||
(9,-8) | ||
(9,-7) | ||
(9,-6) | ||
(9,-5) | ||
(9,-4) | ||
(9,-3) | ||
(9,-2) | ||
(9,-1) | ||
(9,0) | ||
(9,1) | ||
(9,2) | ||
(9,3) | ||
(9,4) | ||
(9,5) | ||
(9,6) | ||
(9,7) | ||
(9,8) | ||
(9,9) | ||
(10,-10) | ||
(10,-9) | ||
(10,-8) | ||
(10,-7) | ||
(10,-6) | ||
(10,-5) | ||
(10,-4) | ||
(10,-3) | ||
(10,-2) | ||
(10,-1) | ||
(10,0) | ||
(10,1) | ||
(10,2) | ||
(10,3) | ||
(10,4) | ||
(10,5) | ||
(10,6) | ||
(10,7) | ||
(10,8) | ||
(10,9) | ||
(10,10) | ||
(11,-11) | ||
(11,-10) | ||
(11,-9) | ||
(11,-8) | ||
(11,-7) | ||
(11,-6) | ||
(11,-5) | ||
(11,-4) | ||
(11,-3) | ||
(11,-2) | ||
(11,-1) | ||
(11,0) | ||
(11,1) | ||
(11,2) | ||
(11,3) | ||
(11,4) | ||
(11,5) | ||
(11,6) | ||
(11,7) | ||
(11,8) | ||
(11,9) | ||
(11,10) | ||
(11,11) | ||
… | ||
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Copyright: This page copyright © 2008 The Ambisonics Association.
