Table of Contents

 1     Scope          
 2     References 
 3     Definitions 
 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           
 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       
        9.1     Signals             
        9.2     Background noise signals          
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        
      11.10     Distortion in receive  
      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 (SRW) 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      
       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 of 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.4     Speech quality in receive direction (in the car under test)              
        C.5     Echo cancellation 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 send   
        I.2                 One-way speech quality in receive             
Bibliography