Content for TR 26.978 Word version: 18.0.0
2 References
3 Definitions and abbreviations
4 General
5 Minimum Performance Requirements
6 Comparison of Candidates by Subjective Means
7 Selection Phase Listening Tests and Results
8 Design Constraints
9 Impact on Voice Activity Factor VAF (with VAD/DTX active)
10 Objective Performance Measurements
11 Feasibility Study: Downlink Noise Suppression for AMR
A Key Selection Phase Documents
B Selection Phase Test Plan
C Global Analysis Spreadsheet
D Methodologies for Measuring Subjective SNR Improvement
E Methodology for NS performance evaluation by Objective Means
F Methodology for Measuring Impact on Voice Activity Factor (VAF)
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2 References p. 6
3 Definitions and abbreviations p. 6
3.1 Definitions p. 6
3.2 Abbreviations p. 7
4 General p. 8
4.1 Project History p. 8
4.2 Overview of the AMR-NS Work Item p. 8
4.3 Presentation of the following clauses p. 9
5 Minimum Performance Requirements p. 10
6 Comparison of Candidates by Subjective Means p. 11
7 Selection Phase Listening Tests and Results p. 12
7.1 Summary of Selection Tests undertaken p. 12
7.2 Summary of Listening Test Results Covering Minimum Performance Requirements p. 13
7.3 Summary of Listening Test Results Covering Comparison of Candidates p. 14
7.4 Graphical Representation of Results from all Formal Listening Tests p. 16
7.4.1 Experiment 2: Degradation in Clean Speech (pair comparison test) p. 16
7.4.2 Experiment 3: Artifacts and Clipping in Background Noise p. 17
7.4.3 Experiment 4: Performance in Background Noise (5.9kbps AMR Speech Codec) p. 19
7.4.4 Experiment 5: Performance in Background Noise (12.2kbps AMR Speech Codec) p. 21
7.4.5 Experiment 6: Performance in Background Noise with Channel Errors (Car Noise with 6dB SNR) p. 23
7.4.6 Experiment 7: Performance in Background Noise with Channel Errors (Street Noise with 9dB SNR) p. 24
7.4.7 Experiment 8: Performance in Car Noise with VAD/DTX active (VAD Option 1) p. 25
7.4.8 Experiment 9: Performance in Street Noise with VAD/DTX active (VAD Option 2) p. 26
7.4.9 Experiment 10: Influence of Input Signal Level and Special Noise Types p. 27
8 Design Constraints p. 28
9 Impact on Voice Activity Factor VAF (with VAD/DTX active) p. 29
10 Objective Performance Measurements p. 30
11 Feasibility Study: Downlink Noise Suppression for AMR p. 30
A Key Selection Phase Documents p. 32
B Selection Phase Test Plan p. 33
C Global Analysis Spreadsheet p. 34
D Methodologies for Measuring Subjective SNR Improvement p. 35
D.1 CCR Experiments p. 35
D.2 ACR Experiments p. 36
E Methodology for NS performance evaluation by Objective Means p. 38
F Methodology for Measuring Impact on Voice Activity Factor (VAF) p. 43
$ Change history p. 47
