1
Scope
2
References
3
Introduction
4
Selection of experiment parameters
4.1 Preparation of test material
4.2 Selection of reference conditions
4.2.1
Reference conditions for low bit-rate codecs without transmission errors
4.2.2 Reference conditions for low bit-rate
codecs with transmission errors
4.3 Test environment
4.4 Listening panel
5
Test method
5.1 Experiment design
5.2 Choice of test stimuli
5.3 Presentation method
5.4 Opinion scales
5.5 Instructions to test subjects
5.6 Analysis of results
6
Derivation of equipment impairment factors
6.1 Necessary amount of
data
6.2 Scale transformation (Step 1)
6.3 Linear interpolation of the test results (Step 2)
6.4 Additivity check (Step 3)
6.5 Derivation of Ie
values for transmission error conditions (Step 4)
6.6 Additivity check (Step 5)
7
Interpretation of derived equipment impairment factor values
Appendix I – Rating scale related
to impairment factors
Appendix II – Bibliography