English, Variations with cardioids – SCHOEPS UMS 20 Benutzerhandbuch
Seite 14
SCHOEPS GmbH · Spitalstr. 20 · D-76227 Karlsruhe (Durlach) · Tel: +49 721 943 20-0 · Fax: +49 721 943 2050
www.schoeps.de · [email protected]
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