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TR 26.921 (SA4) ☆ (Rel-16 draft)
Investigations on Ambient Noise Reproduction Systems
for Acoustic Testing of Terminals

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V0.2.0 (Wzip)  2019/04  84 p.

Rapporteur:  Mr. Reimes, Jan

The present document provides a collection of investigations on aspects of ambient noise testing related to the 3GPP terminal testing specifications TS 26.132 and/or performance requirements per TS 26.131.
The evaluation of terminals in conjunction with speech signals and realistic background noise tests as well as performance requirements were added in Release 11 of these specifications. Increased signal processing capabilities facilitated more sophisticated noise reduction functionality in terminals already before this release. However, an incorrect or mistuned device may substantially impact speech quality, intelligibility/listening effort and user experience in general.
The present document focuses on the evaluation of terminals in handset and hands-free mode, but also other related aspects like, e.g., accuracy of noise field simulations are taken into account.

full Table of Contents for  TR 26.921  Word version:   0.2.0

 

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1  ScopeWord-p. 7
2  References
3  Definitions, symbols and abbreviations
4  Ambient Noise Testing in Hands-free Mode
4.1  Introduction
4.2  Results of Round Robin Test on Different Background Noise Simulation Techniques
4.2.1  Introduction
4.2.2  Test SetupWord-p. 9
4.2.3  Results for Handheld Hands-free
4.2.3.1  Introduction
4.2.3.2  Comparison of inter-lab accuracy for the different background noise simulation methods
4.2.3.3  Comparison of measurement results between ES 202 396-1 and TS 103 224 background noise simulation techniqueWord-p. 29
4.2.3.4  Analysis results according to TS 26.132Word-p. 37
4.2.3.5  Analyses of the noise spectra reproduced at the reference microphoneWord-p. 42
4.2.4  Results for Desktop Hands-freeWord-p. 50
4.2.4.1  Introduction
4.2.4.2  Comparison of inter-lab accuracy for the different background noise simulation methods
4.2.4.3  Comparison between ES 202 396-1 and TS 103 224 background noise simulation techniqueWord-p. 62
4.2.4.4  Analysis results according to TS 26.131 & TS 26.132Word-p. 64
4.2.4.5  Analyses of the noise spectra reproduced at the reference microphoneWord-p. 68
5  Ambient Noise Testing in Handset ModeWord-p. 70
6  ConclusionsWord-p. 77
A  Collection of reports of round robin test in HHHF modeWord-p. 78
B  Detailed results for modified ambient noise playbackWord-p. 79
C  Change historyWord-p. 84

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