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Making Recordings with the MSTC 64 Ug
12
English
Making recordings with the MSTC 64 Ug
When making stereo recordings, one of the
essential aims is to reproduce the pickup area a
(Fig. 4a) in an area spanning 60° during play-
back through loudspeakers (Fig. 4b). The crucial
parameters for getting this just right are:
1. the directivity of the microphones used,
2. the angle w that the microphone axes cover
together,
3. the distance d between the membranes of
the microphone, and
4. the distance a of the microphone from the
sound source.
In the case of ORTF stereo recordings, and
accordingly when using the MSTC 64 Ug, the
first three parameters are already known:
1. Pickup pattern: cardioid
2. Distance between microphones: 17cm
3. Angle
ω
between microphones: 110°
The only parameter left to determine is there-
fore the miking distance. Since the recording
angle of the MSTC 64 Ug is known, the opti-
mum distance to the sound source is also quite
well defined, but there is a certain amount of
leeway. The distance is ideal when it is about
half the width b of the sound source (in fact,
when it is precisely 46%).
Listener
Fig. 4b
The recording angle
α
as shown in Fig. 4a is
reproduced when played back through loud-
speakers at an angle
α
’ of 60°.
α
’=
60°
α
ω
Fig. 4a
Recording angle
α
and axis angle
ω
.
All sound sources should be located within
the area covered by the recording angle.
Tab. 1
Ideal distance a
of microphone to
sound source as
a function of the
given width b of
the sound source
Stereo
main
axis
Area to be recorded
(e.g. orchestra or band)
b
a
d
b
a
2 m
0,9 m
3 m
1,4 m
4 m
1,8 m
5 m
2,3 m
6 m
2,7 m
7 m
3,2 m
10 m
4,6 m
15 m
6,9 m
20 m
9,2 m
