Normalized Free-Field Response Distribution - BRUEL & KJAER HF HATS 5128 User Manual

Fig.3.2 Typical free-field TFR of Type 5128-C (100 Hz – 20 kHz)
135
130
125
120
115
110
dB
105
100
95
90
85
100
3.2.2

Normalized Free-field Response Distribution

The sound-pressure level distribution around the mouth of Type 5128 for "whole speech" is
shown in Fig.3.3; it closely follows the distribution around the human mouth. The measurement
was made with the mouth insert in place.
TFR
1000
Frequency (Hz)
CHAPTER 3
21
Characteristics
10000
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