Making Recordings with the MSTC 64 Ug
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%).
Tab. 1
Ideal distance a
of microphone to
sound source as
a function of the
given width b of
the sound source
10 m
15 m
20 m
12
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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
4,6 m
6,9 m
9,2 m
Area to be recorded
(e.g. orchestra or band)
ω
Fig. 4a
Recording angle α and axis angle ω .
All sound sources should be located within
the area covered by the recording angle.
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°.
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b
Stereo
main
axis
a
α
d
α '=
60°