3M C1060 Manual page 18

TEST RESULTS
Table 2 summarizes the results of the intelligibility testing. Sample results are also shown in the bar
graphs, below.
System
3M™ C1060
(Analog)
Competitive
Digital
3M™ C1060
(Analog)
Competitive
Digital
Table 2: Speech Intelligibility Index (STI) Test Results, Inbound
The relationship between reported STI scores and "subjective evaluation" can be described as shown in
Table 1.
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
TM
3M System, Model C1060 without Noise Reduction,
Competitive Digital System with Noise Reduction, per
out-of-box configurations.
Based upon test performed by independent laboratory
with limited sample.
Noise
Reduction
Setting
Off
Off
On (-6dB)
On (-6dB)
Low Background Noise
(<25dBA)
Excellent
3M
Low Noise Medium Noise
<25dBA (70dBA)
0.86 0.55
0.84 0.58
0.76 0.69
0.82 0.71
Good
Competitive Digital
2 of 4
High Noise
(80dBA)
0.26
0.28
0.49
0.46
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