1 Scope
2
Normative references
3
Definitions and abbreviations
4
Sending characteristics
4.1 Loudness rating
4.2 Sensitivity/frequency characteristics
4.3 Noise
4.4 Distortion
4.5 Discrimination
against out-of-band input signals
5
Receiving characteristics
5.1 Loudness rating
5.2 Sensitivity/frequency characteristics
5.3 Noise
5.4 Distortion
5.5 Spurious out-of-band receiving signals
6
Echo path loss characteristics
6.1 Weighted Terminal Coupling Loss (TCLw)
6.2 Stability loss
7
Delay
Annex A – Objective measurement methods for wideband hands-free telephones
using the reference codec approach
A.1 Introduction
A.2 Electrical interface specifications
A.2.1 Digital interface
A.2.2 Wideband reference codec specifications
A.2.3 Analogue interface
A.2.4 Definition of 0 dBr point
A.3 Electro-acoustic measurement considerations
A.3.1 Testing environment
A.3.2 Electro-acoustic equipment
A.3.3 Test signals
A.3.4 Test signal levels
A.3.5 Accuracy of calibrations
A.4 Sending measurements
A.4.1 Loudness rating
A.4.2 Sensitivity/frequency response
A.4.3 Noise
A.4.4 Distortion
A.4.5 Discrimination against out-of-band input
signals
A.5 Receiving measurements
A.5.1 Loudness rating
A.5.2 Sensitivity/frequency response
A.5.3 Noise
A.5.4 Distortion
A.5.5 Spurious out-of-band signals
A.6 Echo path loss measurements
A.6.1 Weighted Terminal Coupling Loss (TCLw)
A.6.2 Stability loss
A.7 Delay measurements