1
Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 Conventions
6 How to use this Recommendation
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 Idle channel noise
11.7 Out-of-band signals
11.8 Distortion in sending
11.9 Distortion in
receiving
11.10 Echo performance
without background noise
11.11 Double talk
performance
11.12 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 sending
12.5 SRW speech quality
during single talk
13 Car-to-car
communication
13.1 Guidance on subjective
testing
13.2 Test environment and equipment
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 sending direction
C.4 Speech quality in
receiving direction (in the car under test)
C.5 Echo cancellation
performance
C.6 Hands-free system
stability tests (car-to-car)
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