Chapter 4 — Free-field
1
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2
" Microphone Type 4190
Dynamic Range
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
4
−
14
4.5 Dynamic Range
Definition
The dynamic range is the range between the upper limit (determined by distortion)
and the inherent noise floor. Both limits are influenced by the preamplifier. This
section gives values for the microphone with and without a preamplifier.
Inherent Noise
The microphone’s inherent noise is due to thermal movements of the diaphragm.
These vary proportionally with the square root of the absolute temperature (in °K).
The inherent noise increases with increasing temperature. With reference to 20°C,
the inherent noise changes by +0.5dB at 55°C and by –0.5dB at –12°C. The
maximum variation of this noise for different samples of Free-field
1
/
2
" Microphone
Type 4190 is
±
1dB.
Fig.4.15 Typical directional characteristics of the microphone without protection grid
940790e
0°
330°
300°
270°
240°
210°
180°
150°
120°
60°
30°
0
5
– 5
– 10 – 15 – 20
5
0
– 5
– 10 –15 – 20
– 25
90°
0°
330°
300°
270°
240°
210°
180°
150°
120°
60°
30°
0
5
– 5
– 10 – 15 – 20
5
0
– 5
– 10 –15 – 20
– 25
90°
5 kHz
6.3 kHz
8 kHz
10 kHz
12.5 kHz
16 kHz
20 kHz
25 kHz
31.5 kHz
θ°
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