SCHOEPS UMS 20 - Handbuch (Seite 14)

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Variations with Cardioids
14
English
d
ω
Fig. 9a
Recording angle
α and the angle ω between the
microphones; all sound sources should be lying
within the recording angle
α
main stereo
axis
Area to be recorded
(e.g. orchestra or band)
Table 1
This table can be used to determine
the stereophonic recording angle
α
from the ratio of b to a.
b/a angle
α
0.54 30°
0.73 40°
0.93 50°
1.15 60°
1.40 70°
1.68 80°
2.0 90°
2.38 100°
3.46 120°
5.50 140°
11,3 160°
oo 180°
a
b
Fig. 9b
ω and distance d required between two cardioids as a function of the ratio b/a
(see Fig. 9a; simplified from Michael Williams)
spacing d of the microphones in cm
///// not usable
angle
ω
between
the microphones
0 5 10 15 20 25 30 35 40 45 50cm
180°
160°
140°
120°
100°
80°
60°
40°
20°
0°
60°
80°
100°
120°
140°
160°
180°
α
recording angle
α
b/a
α