Recommendation ITU-T P.64 (07/2022) Determination of sensitivity/frequency characteristics of local telephone systems
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations ad acronyms
5 Conventions
6 Sending sensitivities of the LTS
7 Receiving sensitivities of the LTS
8 Artificial mouth and voice
9 Artificial ear
10 Definition of sending sensitivity of an LTS
11 Definition of receiving sensitivity of an LTS
12 Definitions of talker and listener side-tone sensitivities of an LTS
13 Methods for determining SmJ, SJe, SmeST, SRNST and (SM
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
     C.1 Geometry defining a speaking position
     C.2 Geometry defining a change in speaking position
     C.3 Simplification through the use of the position of the ear reference point
     C.4 Vector representation of the reference points
Annex D  Definition of handset positions for measuring loudness ratings and frequency responses using the ITU-T P.57 type 3.4 artificial ear on HATS
     D.1 General
     D.2 Definition of the standard handset position
Annex E  Definition of handset positions for measuring loudness ratings and frequency responses using the ITU-T P.57 types 3.3, 4.3 and 4.4 artificial ear on HATS
     E.1 General
     E.2 Definition of standard handset position
Annex F  Definition of alternative handset positions for measuring loudness ratings  and frequency responses on HATS
     F.1 General
     F.2 Definition of an alternative manufacturer-defined handset position
     F.3 Definition of an alternative manufacturer-defined handset position for non-traditional earpieces
     F.4 Definition of an alternative flat handset position
Annex G  Correspondence between measurements using  the LRGP and the HATS position
Bibliography
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