1 General
1.1 Scope
1.2 References
1.3 Terms and definitions
1.4 Abbreviations
2 Sending characteristics
2.1 Sending loudness rating (SLR)
2.2 Sending frequency responses
2.2.1 Measurement method
2.3 Noise
2.3.1 Idle channel noise
2.4 Non-linear distortion
2.5 Variation of gain with input level
2.5.1 Measurement method
3 Receiving characteristics
3.1 Receiving loudness rating (RLR)
3.2 Volume control
3.3 Receiving frequency responses
3.3.1 Measurement method
3.4 Noise
3.4.1 Idle
channel noise
3.5 Non-linear distortion
3.6 Variation of gain with input level
3.6.1 Measuring method
4 Sidetone characteristics
4.1 Sidetone masking rating (STMR)
4.1.1 Measurement method
4.2 Listener sidetone rating (LSTR)
and D-factor
4.2.1 Measurement method
5
Noise contrast and comfort noise
6 Weighted terminal coupling loss
(TCLw)
6.1 Measurement method
7 Stability loss
7.1 Measurement method
7.1.1 Method 1
7.1.2 Method 2
8 Delay
9 Out-of-band signals
10 Crosstalk ratio
11 Speech clipping
12 Maximum steady state acoustic pressure
12.1 Measurement method
Annex A – Test equipment requirements
A.1 Electro-acoustic equipment
A.2 Test signals
A.3 Accuracy of test equipment