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[|
Channels | Capabilities | Typical applications | Channels | B-Format equivalent | Designation
4 | Full-sphere surround | DVD, HD | LRTQ | WXYZ | PHJ
3 | Full horizontal surround | DVD, HD | LRT | WXY | THJ
2½ | Full horizontal surround | FM Radio | LR band-limited T | WXY | SHJ
2 | Horizontal surround | CD, Radio | LR | - | BHJ
2 | Stereo | CD, Radio | LR | - | -
1 | Mono | Radio | L+R | - | -
|]
http://en.wikipedia.org/wiki/Ambisonic_UHJ_format
Farina:
W = 0.5*(0.982*L + 0.982*R + j*0.164*L - j*0.164*R)
X = 0.5*(0.419*L + 0.419*R - j*0.828*L + j*0.828*R)
Y = 0.5*(0.763*L - 0.763*R + j*0.385*L + j*0.385*R)
L = 0.5 * (0.9397*W + 0.1856*X - j*0.342*W+ j*0.5099*X + 0.655*Y)
R = 0.5 * (0.9397*W+ 0.1856*X + j*0.342*W - j*0.5099*X - 0.655*Y)
soit:
L = (0.0928 + j*0.25495)*X + (0.46985 - j*0.171)*W + 0.3275*Y
R = (0.0928 - j*0.25495)*X + (0.46985 + j*0.171)*W - 0.3275*Y
Malham:
left = (0.0928 + 0.255j)X + (0.4699 - 0.171j)W + (0.3225 - 0.00855j)Y
right= (0.0928 - 0.255j)X + (0.4699 + 0.171j)W - (0.3225 + 0.00855j)Y
Wikipedia:
S = 0.9396926*W + 0.1855740*X
D = j(-0.3420201*W + 0.5098604*X) + 0.6554516*Y
Left = (S + D)/2.0
Right = (S - D)/2.0
T = j(-0.1432*W + 0.6512*X) - 0.7071*Y
Q = 0.9772*Z
soit:
L = 0.5* (0.9396926*W + 0.1855740*X -j*0.3420201*W + j*0.5098604*X + 0.6554516*Y)
R = 0.5* (0.9396926*W + 0.1855740*X +j*0.3420201*W -j*0.5098604*X - 0.6554516*Y)
soit:
L = (0.092787+ j 0.2549302)X + (0.4698463 -j 0.17101005)*W + 0.3277258*Y
R = (0.092787 -j 0.2549302)X + (0.4698463 +j 0.17101005)*W - 0.3277258*Y