ETR 229 : 20001

Foreword
Introduction
1 Scope
2 References
3 Abbreviations
4 Quality under error conditions (A-law, IRS), Experiment 1
5 Quality under error conditions (UPCM, No IRS), Experiment 2
6 Quality under tandeming conditions
   6.1 Quality under tandeming conditions, Experiment 3
   6.2 Effect of tandeming with other standards, Experiment 7
7 Quality under background noise conditions
   7.1 Experiments 4 & 5
   7.2 Special background noise
8 Assessment of equivalent qdu, Experiment 6
9 Talker Dependency, Experiment 8
10 DTX System
   10.1 Assessment of DTX algorithm, Experiment 9
   10.2 Channel activity in DTX mode
11 Performance with DTMF tones
   11.1 Introduction
   11.2 Test set-up
   11.3 Results
   11.4 Conclusions
   11.5 Result tables of experiments with standard and modified
        DTMF detectors
12 Performance with signalling tones
13 Delay
14 Frequency response
15 Half Rate codec complexity
16 Summary of results from characterization Phase I and II
   16.1 Summary of Results From Characterization Phase I
   16.2 Summary of Results From Characterization Phase II
   16.3 Conclusion
Annex A: Bibliography
History

Contains background information on the performance of the GSM half rate speech codec.