1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
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
          7.1.1 Microphone related simulation
          7.1.2 Positioning of the hands-free terminals
          7.1.3 Artificial mouth
          7.1.4 Artificial ear
          7.1.5 Influence of the transmission system
          7.1.6 Calibration and equalization
               7.1.6.1 Calibration
               7.1.6.2 Reference measurement
          7.1.7 System simulator settings
          7.1.8 Environmental conditions
               7.1.8.1 Verification of environmental conditions
8 Digital interfaces for development, debugging and test
     8.1 Interfaces and access points
     8.2 Test set-up and tests
          8.2.1 Recording and insert background noise
          8.2.2 Recording and insert near-end speech recordings
          8.2.3 One-way speech quality in send direction
          8.2.4 Speech distortion in double talk
9 Test signals and test signal levels
     9.1 Signals
     9.2 Background noise signals
          9.2.1 Recording of driving noise
          9.2.2 Playback of the recorded background noise
10 Measurement parameters and requirements for microphones used in speakerphone hands-free systems
     10.1 Microphone measurements in anechoic conditions
          10.1.1 Microphone sensitivity
               10.1.1.1 Requirements
               10.1.1.2 Test
          10.1.2 Microphone frequency response in anechoic conditions
               10.1.2.1 Requirements
               10.1.2.2 Test
          10.1.3 Microphone directional characteristics
               10.1.3.1 Requirements
               10.1.3.2 Test
          10.1.4 Microphone distortion
               10.1.4.1 Requirements
               10.1.4.2 Test
          10.1.5 Maximum sound pressure level
               10.1.5.1 Requirements
               10.1.5.2 Test
          10.1.6 Self-noise
               10.1.6.1 Requirements
               10.1.6.2 Test
     10.2 Microphone measurements in the car
          10.2.1 Microphone output level in the car
               10.2.1.1 Requirements
               10.2.1.2 Test
          10.2.2 Overload point
               10.2.2.1 Requirements
               10.2.2.2 Test
          10.2.3 Microphone frequency response in the car
               10.2.3.1 Requirements
               10.2.3.2 Test
          10.2.4 Idle channel noise
               10.2.4.1 Requirements
               10.2.4.2 Test
          10.2.5 SNR improvement (in the car)
               10.2.5.1 Requirements
               10.2.5.2 Test
11 Measurement parameters and requirements for hands-free terminals
     11.1 Preparation measurements
     11.2 Delay
          11.2.1 Requirements
               11.2.1.1 Requirements for systems without SRW
               11.2.1.2 Requirements for systems with SRW
          11.2.2 Delay in send direction
               11.2.2.1 Test
          11.2.3 Delay in receive direction
               11.2.3.1 Test
     11.3 Loudness ratings
          11.3.1 Requirements
          11.3.2 Test loudness rating in send direction
          11.3.3 Test loudness rating in receive direction
          11.3.4 Variation of loudness rating in send direction
               11.3.4.1 Requirements
               11.3.4.2 Test
          11.3.5 Variation of loudness rating in receive direction
               11.3.5.1 Requirements
               11.3.5.2 Test
     11.4 Sensitivity frequency responses
          11.4.1 Send sensitivity frequency response
               11.4.1.1 Requirements
               11.4.1.2 Test
          11.4.2 Receive sensitivity frequency response
               11.4.2.1 Requirements
               11.4.2.2 Test
     11.5 Speech quality during single talk
          11.5.1 One-way speech quality in send direction
               11.5.1.1 Requirement
               11.5.1.2 Test
          11.5.2 One-way speech quality in receive direction
               11.5.2.1 Requirement
               11.5.2.2 Test
     11.6 Listening speech quality stability
          11.6.1 Listening speech quality stability in send direction
               11.6.1.1 Requirement
               11.6.1.2 Test
          11.6.2 Listening speech quality stability in receive direction
               11.6.2.1 Requirement
               11.6.2.2 Test
     11.7 Idle channel noise
          11.7.1 Idle channel noise in send direction
               11.7.1.1 Requirements
               11.7.1.2 Test
          11.7.2 Idle channel noise in receive direction
               11.7.2.1 Requirements
               11.7.2.2 Test
     11.8 Out-of-band signals
          11.8.1 Discrimination against out-of-band signals in send direction
               11.8.1.1 Requirements
               11.8.1.2 Test
          11.8.2 Spurious out-of-band signal in receive direction
               11.8.2.1 Requirements
               11.8.2.2 Test
     11.9 Distortion in send
          11.9.1 Requirements
          11.9.2 Test
     11.10 Distortion in receive
          11.10.1 Requirements
          11.10.2 Test
     11.11 Echo performance
          11.11.1 Terminal coupling loss
               11.11.1.1 Requirements
               11.11.1.2 Test
          11.11.2 Echo level vs. time
               11.11.2.1 Requirements
               11.11.2.2 Test
          11.11.3 Spectral echo attenuation
               11.11.3.1 Requirements
               11.11.3.2 Test
          11.11.4 Initial convergence without background noise
               11.11.4.1 Requirements
               11.11.4.2 Test
          11.11.5 Initial convergence with background noise
               11.11.5.1 Requirements
               11.11.5.2 Test
          11.11.6 Echo performance with time variant echo path
               11.11.6.1 Requirements
               11.11.6.2 Test
          11.11.7 Echo performance with time variant echo path and speech
               11.11.7.1 Requirements
               11.11.7.2 Test
          11.11.8 Switching characteristics
               11.11.8.1 Activation in send direction
                    11.11.8.1.1 Requirements
                    11.11.8.1.2 Test
               11.11.8.2 Activation in receive direction
                    11.11.8.2.1 Requirements
                    11.11.8.2.2 Test
               11.11.8.3 Attenuation range in send direction
                    11.11.8.3.1 Requirements
                    11.11.8.3.2 Test
                    11.11.8.3.3 Test
               11.11.8.4 Attenuation range in receive direction
                    11.11.8.4.1 Requirements
                    11.11.8.4.2 Test
     11.12 Double talk performance
          11.12.1 Attenuation range in send direction during double talk: AH,S,dt
               11.12.1.1 Requirements
               11.12.1.2 Test
          11.12.2 Attenuation range in receive direction during double talk: AH,R,dt
               11.12.2.1 Requirements
               11.12.2.2 Test
          11.12.3 Detection of echo components during double talk
               11.12.3.1 Requirements
               11.12.3.2 Test
          11.12.4 Sent speech attenuation during double talk
               11.12.4.1 Requirements
               11.12.4.2 Test
     11.13 Background noise transmission
          11.13.1 SNR improvement provided by the HFT algorithm
          11.13.2 Background noise transmission after call set-up
               11.13.2.1 Requirements
               11.13.2.2 Test
          11.13.3 Speech quality in the presence of background noise
               11.13.3.1 Requirements
               11.13.3.2 Test
          11.13.4 Quality of background noise transmission (with far-end speech)
               11.13.4.1 Requirements
               11.13.4.2 Test
          11.13.5 Quality of background noise transmission (with near-end speech)
               11.13.5.1 Requirements
               11.13.5.2 Test
          11.13.6 "Comfort noise" injection
               11.13.6.1 Requirements
               11.13.6.2 Test
12 Verification of the transmission performance of short-range wireless transmission enabled phones
     12.1 Interface definition and calibration
          12.1.1 SRW delay
               12.1.1.1 Requirements
               12.1.1.2 Test in send direction
               12.1.1.3 Test receive direction
     12.2 SRW loudness ratings
          12.2.1 Requirements
          12.2.2 Test SRW JLR in send direction
          12.2.3 Test SRW JLR in receive direction
          12.2.4 SRW linearity in send direction
               12.2.4.1 Requirements
               12.2.4.2 Test
          12.2.5 SRW linearity in receive direction
               12.2.5.1 Requirements
               12.2.5.2 Test
     12.3 SRW sensitivity frequency responses
          12.3.1 SRW send sensitivity frequency response
               12.3.1.1 Requirements
               12.3.1.2 Test
          12.3.2 SRW receive sensitivity frequency response
               12.3.2.1 Requirements
               12.3.2.2 Test
     12.4 SRW noise cancellation test in send direction
          12.4.1 Requirements
          12.4.2 Test
     12.5 SRW speech quality during single talk
          12.5.1 One-way listening speech quality in send direction
               12.5.1.1 Requirement
               12.5.1.2 Test
          12.5.2 Listening speech quality stability in send direction
               12.5.2.1 Requirement
               12.5.2.2 Test
          12.5.3 SRW one-way listening speech quality in receive direction
               12.5.3.1 Requirement
               12.5.3.2 Test
          12.5.4 Listening speech quality stability in receive direction
               12.5.4.1 Requirement
               12.5.4.2 Test
          12.5.5 Verification of disabled echo control
               12.5.5.1 Requirements
               12.5.5.2 Test
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
          16.3.1 Associate headset with vehicle
          16.3.2 Enter the vehicle
          16.3.3 Receive a call
          16.3.4 Make a call
          16.3.5 Terminate a call
          16.3.6 Exit the vehicle
          16.3.7 Listen to other audio source
          16.3.8 Switch between other audio and telephony
          16.3.9 Intra-vehicle communications
Annex A  Speech quality measurements
Annex B  Principles of Relative Approach
Annex C  Example for a questionnaire for subjective testing
     C.1 Performance rating – Overview
     C.2 Test categories and rating types
     C.3 Speech and background noise quality in send direction
          C.3.1 Speech level (office)
          C.3.2 Speech level fluctuations
          C.3.3 Speech quality/speech naturalness
          C.3.4 Intelligibility/listening-effort
          C.3.5 Signal-to-noise ratio for near-end single talk
          C.3.6 Background noise quality
          C.3.7 Noise quality for transient noise sources
          C.3.8 Adaptation to background noise
     C.4 Speech quality in receive direction (in the car under test)
          C.4.1 Speech sound quality/speech naturalness (receive)
          C.4.2 Intelligibility/listening-effort (Receive)
          C.4.3 Speech level (receive, maximum volume)
          C.4.4 Speech level for nominal volume and new call
     C.5 Echo cancellation performance
          C.5.1 Disturbance caused by echo
          C.5.2 Echo intensity
          C.5.3 Echo duration
          C.5.4 Frequency of echo occurrence
          C.5.5 Echo intelligibility
          C.5.6 Comfort noise quality (EC test)
          C.5.7 Speech level variation during double talk
          C.5.8 Intelligibility/listening-effort during double talk
     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
Annex F  Microphone related sound field reproduction technique – Multi-point noise simulation method (MPNS)
     F.1 Loudspeaker setup in the car
     F.2 Microphone setup in the car
     F.3 Background noise recordings and reference noise
     F.4 Equalization
     F.5 Accuracy of the equalization
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
Appendix II  Reporting template for chapter clause 12 testing
Bibliography