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TR 26.931
Evaluation of Additional Acoustic Tests
for Speech Telephony

3GPP‑Page   ETSI‑search   fToC↓   Partial Content →
V19.0.0 (PDF)  2025/09  56 p.
V18.0.0  2024/03  56 p.
V17.0.0  2022/03  56 p.
V16.0.0  2020/06  56 p.
V15.0.0  2017/12  56 p.
Rapporteur:
Mr. Reimes, Jan
HEAD acoustics GmbH

full Table of Contents for  TR 26.931  Word version:  18.0.0

each clause number in 'red' refers to the equivalent title in the Partial Content
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0Introduction  p. 5
1Scope  p. 6
2References  p. 6
3Definitions and abbreviations  p. 8
3.1Definitions  p. 8
3.2Abbreviations  p. 8
4Release 11 "For Further Study" Items  p. 8
4.1Stability loss, Headset UE  p. 8
4.2UE Delay, NB & WB Wireless Headset  p. 8
4.3NB & WB Echo control ("double-talk") characteristics  p. 8
4.3.1Results from a study on NB Echo control ("double-talk") characteristics using P.835 methodology  p. 8
4.3.1.1Background  p. 8
4.3.1.2Test Method & Results  p. 8
4.3.1.2.1Methods  p. 8
4.3.1.2.2Results  p. 12
4.3.2Comparison of predictions from objective metrics to subjective double talk ratings  p. 17
4.3.2.1Background and metrics  p. 17
4.3.2.1.1Method for P.863 computations  p. 17
4.3.2.2Comparison of metrics to subjective SIG ratings  p. 17
4.3.2.3Comparison of metrics to subjective BAK ratings  p. 24
4.3.2.4Comparison of metrics to subjective OVRL ratings  p. 25
4.3.2.5Summary of comparison of metrics to subjective ratings for double-talk  p. 26
4.4Free-field measurements for vehicle-mounted hands-free  p. 27
4.5Idle Channel Noise, Sending/Receiving of test signal  p. 27
5New Acoustic Tests  p. 27
5.1Time-variant user behaviour  p. 27
5.2Additional UE usage environments  p. 27
5.3Results from a study on positional robustness tests and background noise simulations  p. 27
5.3.1General  p. 27
5.3.2Setup  p. 28
5.3.2.0General  p. 28
5.3.2.1Handset Mounting  p. 28
5.3.2.2Background Noise Systems  p. 30
5.3.2.2.0General  p. 30
5.3.2.2.1Equalization process according to ETSI ES 202 396-1  p. 30
5.3.2.2.2Equalization process according to ETSI TS 103 224  p. 31
5.3.2.2.3Background noises  p. 31
5.3.3Measurement Results  p. 31
5.3.3.1Measurements in Silence Condition  p. 31
5.3.3.2Measurements with Ambient Noise  p. 33
5.3.4Summary  p. 35
5.4Results from a study on objective measures with noise suppression and background noise  p. 35
5.4.1Comparison of P.862 to subjective results for noise suppression  p. 35
5.4.2Experiment 1 - NB P.835 versus P.862.1  p. 36
5.4.2.1Setup  p. 36
5.4.2.2Results  p. 36
5.4.3Experiment 2 - Problems with tuning for P.862.1  p. 38
5.4.3.1Setup  p. 38
5.4.3.2Results  p. 38
5.4.4Experiment 3: WB P.835 v P.862.2, P.863 and TS 103 106  p. 39
5.4.4.1Setup  p. 39
5.4.4.2WB Correlation Results  p. 39
5.4.4.3WB Rank Order Results  p. 40
5.4.5Experiment 4 SWB P.835 v P.862.2, P.863 and TS 103 106  p. 42
5.4.5.1Setup  p. 42
5.4.5.2SWB Correlation Results  p. 42
5.4.5.3SWB Rank Order Results  p. 43
5.4.6Conclusions  p. 45
5.5Validation results for combination of model A and B according to ETSI TS 103 281  p. 46
5.5.1Introduction  p. 46
5.5.2Description of combination of model predictions  p. 46
5.5.3Validation database 3 (DES-25): Results for combined model  p. 47
5.5.4Validation database 4 (DES-26): Results for combined model  p. 49
5.5.5Validation database 5 (DES-27): Results for combined model  p. 51
5.5.6Conclusions  p. 53
6Conclusions  p. 53
$Change history  p. 54

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