Chapter 5 — Free-field
1
/
2
" Microphone Type 4191
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
BE1377– 12
5
−
9
For applications where the vent is not exposed to the sound field, take care to
ensure proper static pressure equalization to prevent static displacement of the
diaphragm.
The microphone’s low-frequency response is common for all types of sound field.
The microphone’s lower limiting frequency (–3dB) is between 1 and 2Hz with the
vent exposed to the sound field. This is measured during production to ensure that
specifications are fulfilled.
5.3.5 Free-field Response
The microphone’s free-field correction curves are shown in Fig.5.6 and Fig.5.8.
These corrections are added to the microphone’s actuator response obtained using
Electrostatic Actuator UA0033 in order to determine the free-field response at any
angle of incidence. The typical free-field response at 0° incidence with and without
the protection grid are shown in Fig.5.7 and Fig.5.9.
Fig.5.6 Free-field correction curves for the microphone with Pro-
tection Grid DB3421
940800/1e
90°
500 1k 10k 50kFrequency (Hz)
– 5
– 2.5
2.5
Correction (dB)
5
7.5
10
12.5
15
– 10
– 7.5
0
60°
Ran-
dom
180°
120°
150°
30°
0°
θ°
To Next Page
Loading...
