5.7 Sidetone Masking Rating (STMR) ..........................................................................111
5.7.1 STMR Tests Using Artificial Voice according to ITU-T P.50 or Single-Talk Speech
according to ITU-T P.501 as Test Signal ...................................................................112
5.8 Sidetone Delay .........................................................................................................113
5.9 Roundtrip Delay .......................................................................................................114
5.10 Receiving Impairments ...........................................................................................116
5.11 Jitter Buffer Management Behaviour .....................................................................118
5.12 Echo Loss (TCLw)....................................................................................................119
5.13 Stability Margin ........................................................................................................120
5.14 Stability Loss ............................................................................................................121
5.15 Echo Control Characteristics .................................................................................122
5.16 Sending Distortion ...................................................................................................125
5.17 Receiving Distortion ................................................................................................129
5.18 Idle Channel Noise Sending ...................................................................................132
5.19 Idle Channel Noise Receiving .................................................................................134
5.20 Ambient Noise Rejection ........................................................................................136
5.21 Speech Quality in Presence of Ambient Noise .....................................................138
5.21.1 Setup ..........................................................................................................................138
5.21.2 Connections ...............................................................................................................139
5.21.3 Switcher Support........................................................................................................139
5.21.4 Prerequisites ..............................................................................................................141
5.21.5 Measurement .............................................................................................................141
5.21.6 Continuing Aborted Measurements ...........................................................................143
5.21.7 Typical Problems during measurement .....................................................................143
5.21.8 Additional operations when finished ..........................................................................145
5.21.9 Extended Speech Quality Measurements .................................................................145
5.21.10 Continuing Aborted Extended Measurements ...........................................................146
5.22 UE Send Clock Accuracy ........................................................................................147
5.23 Notes on Hands-Free Measurements ....................................................................148
5.23.1 General Remarks .......................................................................................................148
5.23.2 Test Setup ..................................................................................................................148
5.23.3 Acoustic Calibration for Hands Free Tests ................................................................150
5.24 “Utilites” Measurements .........................................................................................151
5.24.1 Sidetone Distortion.....................................................................................................151
5.24.2 Gain Variation Tests ..................................................................................................152
5.24.3 Delay Measurements .................................................................................................153
5.24.4 Background Noise Measurements .............................................................................154