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7
English
ORTF
Hörer
Fig. 6b
The recording angle
α
as shown in F ig. 6a is
reproduced during playback through loud-
speakers at an angle range
α
’ of 60°.
α
’= 60°
Fig. 7a
ORTF: The recording angle of 95° can be
achieved accurately enough by setting the
microphone distance to: a= b/2.
a
b
Area to be recorded
(e.g. orchestra or band)
from the centre of each microphone's sound
inlet) is 17 cm for an ORTF setup, where the
axis angle ω between the microphones is 110°.
The axis and recording angles are s hown in
F ig. 6a. In the case of OR TF : α = 95°.
The distance to the sound sources should
then be chosen such that all sound sources
are within this area. This can be most easily
achieved by making the distance of the bar
from the sound sources equal to about half
the width of its range (a= b × 0.46):
d
α
ω
ca. 95°
Fig. 6a
Recording angle
α
and axis angle
ω
.
For transforming
α
into the angle range
α
’
(which is the range of 60° between the
speakers), all s ound sources must be within
the recording angle
α
.
Stereo
main axis
Area to be recorded
(e.g. orchestra or band)
Fig. 7b
M 100 C in ORTF arrangement
17cm
110°
