�1���� Scope���������
�2���� References
�3���� Definitions
�4���� Abbreviations���������
�5���� Conventions�����������
�6���� How to use this Recommendation�
������� 6.1���� Determining compliance with this Recommendation�
������� 6.2���� Testing at different stages of the development cycle��
�7���� Test arrangement��
������� 7.1���� Test arrangement in a car������
�8���� Digital interfaces for development, debugging and test�������
������� 8.1���� Interfaces and access points�
������� 8.2���� Test set-up and tests
�9���� Test signals and test signal levels����
10���� Measurement parameters and requirements for microphones used in
speakerphone hands-free systems����
������ 10.1���� Microphone measurements in anechoic conditions��
������ 10.2���� Microphone measurements in the car�����������
11���� Measurement parameters and requirements for hands-free terminals������
������ 11.1���� Preparation measurements�
������ 11.2���� Delay������������
������ 11.3���� Loudness ratings������
������ 11.4���� Sensitivity frequency responses��������
������ 11.5���� Speech quality during single talk�������
������ 11.6���� Listening speech quality stability�������
������ 11.7���� Idle channel noise����
������ 11.8���� Out-of-band signals�
������ 11.9���� Distortion in send direction��
����� 11.10���� Distortion in receive direction�����������
����� 11.11���� Echo performance without background noise�����������
����� 11.12���� Double talk performance����
����� 11.13���� Background noise transmission��������
12���� Verification of the transmission performance of short range wireless
transmission enabled phones����
������ 12.1���� Interface definition and calibration��
������ 12.2���� SRW loudness ratings������������
������ 12.3���� SRW sensitivity frequency responses��������������
������ 12.4���� SRW noise cancellation test in send direction�������������
������ 12.5���� SRW speech quality during single talk�������������
13���� Car-to-car communication
14���� Guidance on subjective testing������
15���� Corded headsets��
������ 15.1���� Connector type���������
������ 15.2���� Connector wiring and electrical specifications������������
������ 15.3���� Headset receive characteristics����������
� �����15.4���� Headset transmit characteristics�������
������ 15.5���� Standard behaviour in the presence of corded headsets��������
16���� Wireless headsets
������ 16.1���� Wireless headset types���������
������ 16.2���� Test methodology for verification of standard behaviour������
������ 16.3���� Standard behaviour in the presence of wireless headsets������
Annex A � Speech quality measurements����
Annex B � Principles of Relative Approach����
Annex C � Example for a Questionnaire for subjective testing����
�C���� Performance rating�������������
������� C.1���� Overview������
������� C.2���� Test categories and rating types���������
������� C.3���� Speech and background noise quality in send direction�����������
������� C.4���� Speech quality in receive direction (in the car under test)�������
������� C.5���� Echo cancellation (EC) performance��
������� C.6���� Hands-free system stability tests (car-to-car)
Annex D � Standard set of user scenarios����
Annex E � System stability with insufficient far‑end echo loss����
Appendix I � A method to determine the listening speech quality����
������� I.1���� ���������� One‑way speech quality in sending��������
������� I.2���� ���������� One-way speech quality in receiving������
Bibliography����