1 Introduction
2
Normative references
3
Definitions and abbreviations
4
Transmission characteristics
4.1 Sending sensitivity
4.2 Receiving sensitivity
4.3 Frequency response curves
4.3.1 Sending
4.3.2 Receiving
4.4 Subjective determinations
4.4.1 Sending
4.4.2 Receiving
4.5 Objective evaluations
4.5.1 Sensitivity measurement
4.5.1.1 Sending sensitivity
measurements
4.5.1.2 Receiving sensitivity
measurements
4.5.2 Measure and computation of loudness
ratings
4.5.2.1 Sending loudness rating
4.5.2.2 Receiving loudness
rating
4.6 Switching parameters
5
Testing conditions
5.1 Test table
5.2 Test arrangement
5.3 Calibration of the artificial mouth
5.4 Test environment
5.5 Test signals
5.6 Test signal levels
6
Conversational quality
7
Parameters measured instrumentally
7.1 Attenuation range aH
7.2 Attenuation distribution at idle mode
7.3 Hang-over time
7.4 Dynamic compression
7.5 Reverberance
7.6 Time-dependent transfer function
7.7 Duplex behaviour
7.8 Control characteristics of echo cancellation
7.9 Quality of speech detection
7.10 Quality of speech detection with ambient noise
8
Classification
9
Parameters to be evaluated for each type of HFT
10 Bibliographic references