1
Scope
2
Normative references
3
Abbreviations
4
Sending sensitivities of the LTS
5
Receiving sensitivities of the LTS
6
Artificial mouth and voice
7
Artificial ear
8
Definition of sending sensitivity of an LTS
8.1 Measurement of telephone sets containing carbon microphones
9
Definition of receiving sensitivity of an LTS
10 Definitions of talker and
listener sidetone sensitivities of an LTS
11 Methods for determining SmJ, SJe, SmeST, SRNSTand DSM
Annex A – Definitions of mouth reference point and ear
reference point
Annex B – The application of complex terminating impedances when measuring SLR
and RLR
B.1 Complex impedance terminations
B.2 Impedance converter
B.3 Differences when measuring a telephone set with a complex
impedance using 600 ohm terminations
Annex C – Definition of the speaking position for
measuring loudness ratings of handset
telephones
Annex D – Definition of handset positions for measuring loudness ratings and
frequency responses using the P.57 type 3.4 artificial ear on HATS
Annex E – Definition of handset position for measuring of loudness ratings and
frequency responses using the P.57 types 3.2 and 3.3 ear simulators on HATS
Annex F – Correspondence between measurements using the LRGP and the HATS
position