Instruction manual

105
Technical Notes
Directional characteristics
The directional characteristics of a microphone is a measure of its differing sensitivity for
sound waves arriving from various angles. Since the prepolarized condenser microphone
used in the NA-27 is a pressure-sensitive type, it should be equally sensitive in all direc-
tions. However, refraction and cavity effects cause a certain microphone directional char-
acteristics at high frequencies. The diagram below shows the directional characteristics of
the microphone UC-53A.