1 Scope
2
References
3
Definitions
4
Abbreviations
5
Conventions
6
Summary of subjective testing procedures
7
Source recordings
7.1 Recording system
7.2 Speech samples
8
Selection of experiment parameters
8.1 Codec conditions
8.2 Reference conditions
9
Experiment design
10 Listening test procedure
10.1 Receiving system
10.2 Opinion scales
10.3 Electrical noise
11 Analysis of results
Annex A – Comparison of different SNR definitions
Annex B – Sets of parameters to determine codec performance
B.1 Narrow‑band systems (300-3400 Hz)
B.2 Wideband systems (100-7000 Hz)
Annex C – PCM codec corresponding to one qdu
C.1 Common analogue interface
C.2 Digital interface
C.3 Analogue interface
Annex D – Modified IRS send and receive characteristics
Bibliography