Rec. ITU-T P.1110 (03/2017) iii
Table of Contents
Page
1 Scope ............................................................................................................................. 1
2 References ..................................................................................................................... 1
3 Definitions .................................................................................................................... 2
3.1 Terms defined elsewhere ................................................................................ 2
3.2 Terms defined in this Recommendation ......................................................... 2
4 Abbreviations and acronyms ........................................................................................ 4
5 Conventions .................................................................................................................. 6
6 How to use this Recommendation ................................................................................ 6
6.1 Determining compliance with this Recommendation .................................... 6
6.2 Testing at different stages of the development cycle ..................................... 7
7 Test arrangement .......................................................................................................... 7
7.1 Test arrangement in a car ............................................................................... 9
8 Digital interfaces for development, debugging and test ............................................... 13
8.1 Interfaces and access points ............................................................................ 13
8.2 Test set-up and tests ........................................................................................ 15
9 Test signals and test signal levels ................................................................................. 16
9.1 Signals ............................................................................................................ 16
9.2 Background noise signals ............................................................................... 17
10 Measurement parameters and requirements for microphones used in speakerphone
hands-free systems ........................................................................................................ 19
10.1 Microphone measurements in anechoic conditions ........................................ 19
10.2 Microphone measurements in the car ............................................................. 22
11 Measurement parameters and requirements for hands-free terminals .......................... 27
11.1 Preparation measurements .............................................................................. 27
11.2 Delay ............................................................................................................... 27
11.3 Loudness ratings ............................................................................................. 29
11.4 Sensitivity frequency responses ..................................................................... 32
11.5 Speech quality during single talk ................................................................... 36
11.6 Listening speech quality stability ................................................................... 37
11.7 Idle channel noise ........................................................................................... 38
11.8 Out-of-band signals ........................................................................................ 40
11.9 Distortion in send ........................................................................................... 42
11.10 Distortion in receive ....................................................................................... 42
11.11 Echo performance ........................................................................................... 43
11.12 Double talk performance ................................................................................ 52
11.13 Background noise transmission ...................................................................... 59
12 Verification of the transmission performance of short-range wireless transmission
enabled phones .............................................................................................................. 63
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