1 Scope
2
Normative References
3
Definitions and abbreviations
4
Sending loudness rating (SLR) and receiving loudness ratings (RLR)
5
Sidetone Masking Rating (STMR) and Listener Sidetone Rating (LSTR)
6
Sending and receiving sensitivity frequency characteristics for digital
telephones
7
Noise characteristics at sending and receiving
8
Distortion characteristics at sending and receiving
8.1 Method 1 (Noise method)
8.1.1 Sending
8.1.2 Receiving
8.2 Method 2 (Sinewave method)
8.2.1 Sending
8.2.2 Receiving
9
Out-of-band signals
9.1 Sending
9.2 Receiving
10 Weighted Terminal Coupling Loss
(TCLw)
11 Stability loss
12 Delay
13 Input versus output (amplitude)
characteristics
Annex A – Variation of gain with input level
A.1 Sending direction
A.2 Receiving direction
Annex B – Objective measurement methods for testing
B.1 Introduction
B.2 Approaches for testing digital telephones
B.2.1 Direct
digital processing approach
B.2.2 Codec
approach
B.3 Definition of 0 dB reference point
B.4 Definition of interfaces
B.5 Codec specification
B.5.1 Ideal
codec
B.5.2 Reference
codec
B.5.2.1 Analogue interface
B.5.2.2
Digital interface
B.6 Measurement of digital telephone transmission characteristics
B.6.1 Sending
B.6.1.1 Sending frequency
characteristic
B.6.1.2
Sending loudness rating
B.6.1.3 Distortion
B.6.1.4 Noise
B.6.1.5 Discrimination
against out-of-band input signal
B.6.2 Receiving
B.6.2.1 Receiving frequency
characteristic
B.6.2.2 Receiving loudness
rating
B.6.2.3 Distortion
B.6.2.4 Noise
B.6.2.5 Spurious out-of-band
signals
B.6.3 Sidetone
B.6.3.1 Sidetone frequency
characteristic
B.6.3.1.1 Talker sidetone frequency characteristic
B.6.3.1.2 Listener sidetone
frequency characteristic
B.6.3.2 Sidetone masking
rating
B.6.3.3 Listener sidetone
rating
B.6.4 Terminal
coupling loss
B.6.5 Stability
B.6.6 Delay
B.6.7 Input
versus output (amplitude) characteristics
B.6.7.1 Designed
non-linearity
B.6.7.2 Linear
B.6.7.2.1 Sending
B.6.7.2.2 Receiving
Annex C – Distortion allowances