Ambisonic Channels

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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

(For the definition of l and m see the Glossary.)

Click on an ACN for full details about that channel.

;
ACN(l,m)letter code
0(0,0)W
1(1,-1)Y
2(1,0)Z
3(1,1)X
4(2,-2)V
5(2,-1)T
6(2,0)R
7(2,1)S
8(2,2)U
9(3,-3)Q
10(3,-2)O
11(3,-1)M
12(3,0)K
13(3,1)L
14(3,2)N
15(3,3)P
16(4,-4)
17(4,-3)
18(4,-2)
19(4,-1)
20(4,0)
21(4,1)
22(4,2)
23(4,3)
24(4,4)
25(5,-5)
26(5,-4)
27(5,-3)
28(5,-2)
29(5,-1)
30(5,0)
31(5,1)
32(5,2)
33(5,3)
34(5,4)
35(5,5)
36(6,-6)
37(6,-5)
38(6,-4)
39(6,-3)
40(6,-2)
41(6,-1)
42(6,0)
43(6,1)
44(6,2)
45(6,3)
46(6,4)
47(6,5)
48(6,6)
49(7,-7)
50(7,-6)
51(7,-5)
52(7,-4)
53(7,-3)
54(7,-2)
55(7,-1)
56(7,0)
57(7,1)
58(7,2)
59(7,3)
60(7,4)
61(7,5)
62(7,6)
63(7,7)
64(8,-8)
65(8,-7)
66(8,-6)
67(8,-5)
68(8,-4)
69(8,-3)
70(8,-2)
71(8,-1)
72(8,0)
73(8,1)
74(8,2)
75(8,3)
76(8,4)
77(8,5)
78(8,6)
79(8,7)
80(8,8)
81(9,-9)
82(9,-8)
83(9,-7)
84(9,-6)
85(9,-5)
86(9,-4)
87(9,-3)
88(9,-2)
89(9,-1)
90(9,0)
91(9,1)
92(9,2)
93(9,3)
94(9,4)
95(9,5)
96(9,6)
97(9,7)
98(9,8)
99(9,9)
100(10,-10)
101(10,-9)
102(10,-8)
103(10,-7)
104(10,-6)
105(10,-5)
106(10,-4)
107(10,-3)
108(10,-2)
109(10,-1)
110(10,0)
111(10,1)
112(10,2)
113(10,3)
114(10,4)
115(10,5)
116(10,6)
117(10,7)
118(10,8)
119(10,9)
120(10,10)
121(11,-11)
122(11,-10)
123(11,-9)
124(11,-8)
125(11,-7)
126(11,-6)
127(11,-5)
128(11,-4)
129(11,-3)
130(11,-2)
131(11,-1)
132(11,0)
133(11,1)
134(11,2)
135(11,3)
136(11,4)
137(11,5)
138(11,6)
139(11,7)
140(11,8)
141(11,9)
142(11,10)
143(11,11)

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This page copyright © 2008 The Ambisonics Association.