EN-18
16. DIRECTIONAL CHARACTERISTICS OF THE COMPLETE INSTRUMENT
The directional characteristics of a microphone give a measure of its differing
sensitivity for sound waves arriving from various angles. Since the pre-polarized
condenser microphone used in the instrument is a pressure-sensitive type, it should
be equally sensitive in all directions. However, refraction and cavity effects cause
certain microphone directional characteristics at high frequencies. The diagrams
below show the directional characteristics of the complete instrument with the
microphone MC-21.
Ov
Un
Ov
Un
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
dB
30
o
0
o
90
o
150
o
180
o
270
o
330
o
60
o
210
o
120
o
240
o
300
o
Directional characteristics for frequency equal to 1000Hz
