Rec. ITU-T P.64 (03/1993) … DETERMINATION OF SENSITIVITY/FREQUENCY CHARACTERISTICS OF LOCAL TELEPHONE SYSTEMS
FOREWORD
CONTENTS
1 Introduction
2 Sending sensitivities of the LTS
3 Receiving sensitivities of the LTS
4 Artificial mouth and voice
5 Artificial ear
6 Definition of sending sensitivity of an LTS
7 Definition of receiving sensitivity of an LTS
8 Definitions of talker and listener sidetone sensitivities of an LTS
9 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 ohms terminations
Annex C … Definition of the speaking position for measuring loudness ratings of handset telephones