Audio Engineering

Pink

noise

Filter

set

Power

amplifier

Sound

level meter

Microvolt

meter

94 dB-SPL

Test

loudspeaker

Figure 22.1 : Measuring microphone sensitivity.

Figure 22.2 : Response characteristics of a passive fi lter set.
(Courtesy of United Recording Electronics Industries.)

Loss (dB)

Frequency (Hz)

0

 10

 20

 30

 40

 50

20 50 100 200 500 1 K 2 K 5 K 10 K

70 Hz

100 Hz150 Hz250 Hz500 Hz1000 Hz2000 Hz3000 Hz5000 Hz7500 Hz

600 600

(a) Low pass section

0

 10

 20

 30

 40

 50

Loss (dB)

20 50 100 200 500 1 K 2 K 5 K 10 K

Frequency (Hz)

250 Hz

10 kHz

5 kHz 6 kHz

500 Hz1 kHz2 kHz3 kHz4 kHz

8 kHz

600 600

(b) High pass section