Variants With Cardioids - Schoeps UMS 20 User Manual

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