1 Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 Conventions
6 How to use this Recommendation
7 Architectures
7.1 Distributed speakerphone
7.2 System with integrated microphone
7.3 System with integrated speaker
7.4 System with integrated microphone and speaker
8 Subsystems
8.1 System delay, subsystem delay and buffering
8.2 Test interface description
8.3 Acoustic subsystem
8.4 Signal enhancement subsystem
9 Bidirectional signal transport including network transport
9.1 Bidirectional transport delay in send direction
9.2 Clock drift in send direction
9.3 Bidirectional transport delay in receive direction
9.4 Clock drift in receive direction
9.5 Bidirectional transport send junction loudness ratings
9.6 Bidirectional transport receive loudness ratings
9.7 Bidirectional transport linearity in send direction
9.8 Bidirectional transport linearity in receive direction
9.9 Bidirectional transport send sensitivity frequency response
9.10 Bidirectional transport receive sensitivity frequency response
9.11 Bidirectional transport idle channel noise in send
9.12 Bidirectional transport idle channel noise in receive
9.13 Bidirectional transport noise cancellation test in send
direction
9.14 Bidirectional transport one‑way speech quality in send
direction
9.15 Bidirectional transport speech quality stability in send
direction
9.16 Bidirectional transport one‑way speech quality in receive
direction
9.17 Bidirectional transport speech quality stability in receive
direction
9.18 Verification of bidirectional transport disabled echo control
9.19 Bidirectional transport subsystem weighted terminal coupling
loss (TCLwBD) and (TCLBD)
10 Unidirectional signal transport: Wired and short range wireless
transmission
10.1 Test set-up
10.2 Unidirectional transport delay
10.3 Unidirectional clock drift
10.4 Unidirectional transport junction loudness ratings
10.5 Unidirectional transport linearity
10.6 Unidirectional transport sensitivity frequency response
10.7 Unidirectional transport idle channel noise
10.8 Unidirectional transport noise cancellation test
10.9 Unidirectional transport speech quality
10.10 Unidirectional transport speech quality stability
Annex A – Microphone measurements in anechoic conditions
A.1 Microphone sensitivity (in anechoic conditions)
A.2 Microphone frequency response (in anechoic conditions)
A.3 Microphone directional characteristics (in anechoic conditions)
A.4 Microphone distortion (in anechoic conditions)
A.5 Microphone maximum sound pressure level (in anechoic
conditions)
A.6 Microphone dynamic range (in anechoic conditions)
Annex B – Standard set of user scenarios
Annex C – Frame process and delay
C.1 General
C.2 Frame interval
C.3 Delay
C.4 Arbitration between two subsystems with different frame
intervals
C.5 Subsystem delay and relationship to overall delay
C.6 Example
Appendix I – Testing for Noise Distortion
I.1 Parameter description
I.2 Test
I.3 Classification of performance level based on values of this
parameter
I.4 Design guidance and root-cause analysis
Appendix II – Reference-free SNR measurement
II.1 Introduction
II.2 Signal-to-noise ratio measurement
II.3 Noise variance tracking and voice activity detection
II.4 Speech pause detection
II.5 Measurement set-up
Appendix III – Measuring and applying impulse response traces for dynamic test
conditions
III.1 Introduction
Page
III.2 Excitation signal
III.3 Measurement Set-up
III.4 System model
III.5 Signal convolution
Bibliography