Schoeps MAB 1000 Bedienungsanleitung PDF herunterladen (Seite 11)

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A/B Stereo

stereo

main axis

Distance d between the microphones and

recording angle

α;

the sound sources should

be lying within the recording angle

recording

angle α:

distance d

between the

microphones:

60° 76 cm

80° 60 cm

100° 50 cm

120° 44 cm

140° 40 cm

The distance a is particularly important: it

influences not only the reproduction, but also

the sound, since it defines the ratio of direct

to reflected sound (diffuse sound). At a small

distance, the recording will sound “dry” while,

at a large distance, more “room” will be

recorded. The latter could be desirable if the

room has nice acoustics. What this all implies

is that it is best to choose the distance primarily

for aesthetic purposes, where the acoustic

properties of the room are as important as

anything else. In the process, the distance d

between the microphones will be set which

derives from the relationship of microphone

distance a to stage width b. It can be obtained

from the table which follows.

Even in A/B recordings with pressure trans-

ducers the microphones can be turned slightly

outward, since pressure transducers at higher

frequencies do not have an ideal omnidirec-

tional pattern. This characteristic can be

exploited to obtain level differences between

the channels.

stage width

microphone distance from stage

Area to be recorded

(e.g. orchestra or band)

Table 1

This table is used to determine the recording

angle from the ratio b/a. a and b can be meas-

ured in meters, steps etc.

b/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°

Table 2

This table is for ”spaced omni” recordings, and

gives the distance d between the microphones

as a function of the recording angle

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17

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