Content for TR 26.921 Word version: 18.0.0
4 Ambient Noise Testing in Hands-free Mode
5 Ambient Noise Testing in Handset Mode
6 Conclusions
A Collection of reports of round robin test in HHHF mode
B Detailed results for modified ambient noise playback
$ Change history
4 Ambient Noise Testing in Hands-free Mode p. 7
4.1 Introduction p. 7
4.2 Results of Round Robin Test on Different Background Noise Simulation Techniques p. 7
4.2.1 Introduction p. 7
4.2.2 Test Setup p. 8
4.2.2.1 Laboratories p. 8
4.2.2.2 Noise field simulations p. 8
4.2.2.3 Noise Types p. 10
4.2.2.4 Devices p. 10
4.2.2.5 Speech Quality Test Methodology p. 10
4.2.3 Results for Handheld Hands-free p. 11
4.2.3.1 Introduction p. 11
4.2.3.2 Comparison of inter-lab accuracy for the different background noise simulation methods p. 11
4.2.3.3 Comparison of measurement results between ES 202 396-1 and TS 103 224 background noise simulation technique p. 27
4.2.3.4 Analysis results according to TS 26.132 p. 35
4.2.3.5 Analyses of the noise spectra reproduced at the reference microphone p. 41
4.2.4 Results for Desktop Hands-free p. 49
4.2.4.1 Introduction p. 49
4.2.4.2 Comparison of inter-lab accuracy for the different background noise simulation methods p. 49
4.2.4.2.1 Wideband p. 49
4.2.4.2.2 Narrowband p. 55
4.2.4.3 Comparison between ES 202 396-1 and TS 103 224 background noise simulation technique p. 61
4.2.4.4 Analysis results according to TS 26.131 & TS 26.132 p. 63
4.2.4.5 Analyses of the noise spectra reproduced at the reference microphone p. 67
5 Ambient Noise Testing in Handset Mode p. 69
5.1 Introduction p. 69
5.2 Analysis of modified ambient noise playback systems p. 69
5.2.1 Motivation p. 69
5.2.2 Test Setup p. 70
5.2.3 Noise Types p. 72
5.2.4 Measurement rooms p. 72
5.2.5 Results p. 72
5.2.6 Discussion p. 74
5.2.7 Conclusions p. 75
5.3 Noise Field Simulations in different Labs p. 75
5.3.1 Introduction p. 75
5.3.2 Noise Field Simulations p. 75
5.3.2.1 System according to ES 202 396-1 (binaural noise sources) p. 75
5.3.2.2 System according to TS 103 224 (8-channel sources) p. 75
5.3.2.3 System according to TS 103 224 (binaural noise sources) p. 76
5.3.3 Noise Types p. 77
5.3.4 Measurement rooms p. 79
5.3.4.1 Geometry p. 79
5.3.4.2 Acoustic Room Parameters p. 81
5.3.4.3 Diffusivity Delays p. 82
5.3.4.4 Equalization Results p. 82
5.3.5 Test Methodology p. 88
5.3.5.1 Spectral Analysis p. 88
5.3.5.2 Error Metrics p. 88
5.3.6 Measurement Results p. 89
5.3.6.1 Overall Results p. 89
5.3.6.2 Results per Room p. 91
5.3.6.3 Results per Background Noise p. 92
5.3.6.4 Impact of Bandwidth p. 94
5.3.7 Discussion p. 97
6 Conclusions p. 97
A Collection of reports of round robin test in HHHF mode p. 99
A.1 Introduction p. 99
A.2 List of documents p. 99
B Detailed results for modified ambient noise playback p. 100
B.1 Introduction p. 100
B.2 Configuration A p. 101
B.3 Configuration B p. 101
B.4 Configuration C p. 102
B.5 Configuration D p. 103
$ Change history p. 105
