TR 26.901
Adaptive Multi-Rate Wideband (AMR-WB) speech codec;
Feasibility study report
V4.0.1 (PDF)
2000/04 31 p.
- Rapporteur:
- Dr. Bruhn, Stefan
full Table of Contents for TR 26.901 Word version: 4.0.1
0 Introduction p. 5
The present document contains the AMR Wideband Feasibility Report produced by 3GPP TSG-S4 and ETSI SMG11 before the approval of the related Work Item by TSG-SA.
Executive Summary and Recommendations are listed in Annex A.
The AMR wideband (AMR-WB) service option was considered within SMG11 already during the AMR narrowband feasibility study and development phases during 1997-1998. Many aspects of wideband were not resolved at that time due to lack of time and conflicting opinions. SMG meeting #23 (October 1997) decided that the AMR narrowband program should not be delayed for the sake of introducing a wideband mode and that feasibility assessment with regard to wideband should be completed as soon as possible. Wideband could then be added to AMR as a later option according to the outcome of the feasibility assessment. Due to intensive AMR narrowband development and standardization, the main part of the wideband feasibility study has been carried out after SMG meeting #27 (October 1998).
1 Scope p. 6
The present document presents the outcome of the Feasibility Study Phase of wideband Adaptive Multi-rate codec. Clauses 4 to 6 provide an overview and background for introducing AMR wideband. Clause 7 provides a review of relevant standardization activities. Feasibility aspects such as codec performance, speech coding bit-rates, implementation complexity and transmission delay are discussed in clauses 8 and 9. Clause 10 outlines the target timeplan for AMR-WB codec development, testing, selection and standardization. Clauses 11, 12 and 13 conclude with a summary of the risks and recommendations.
2 References p. 6
3 Definitions and abbreviations p. 7
3.1 Definitions p. 7
3.2 Abbreviations p. 7
4 Goals of AMR wideband codec p. 8
5 Terminology p. 8
6 Overview p. 9
6.1 Benefits p. 9
6.2 Basic operation p. 9
6.3 Application scenarios p. 9
6.4 Development Timescales p. 9
7 Standardization background p. 10
8 Feasibility aspects for GSM full-rate traffic channel p. 12
8.1 Basis for the feasibility study p. 12
8.2 Speech quality performance p. 13
8.2.1 Benefit of wideband over narrowband p. 13
8.2.2 Wideband coding performance for clean speech (below 14.4 kbit/s) p. 13
8.2.3 Wideband coding performance under background noise conditions (below 14.4 kbit/s) p. 14
8.2.4 Wideband coding performance under several channel conditions (below 14.4 kbit/s) p. 14
8.2.5 Wideband coding performance under tandeming conditions (below 14.4 kbit/s) p. 15
8.2.6 Wideband coding at modes above 14.4 kbit/s p. 15
8.2.7 ITU-T standardization information relevant to AMR-WB feasibility study p. 15
8.2.8 Summary p. 15
8.3 Performance requirements specification p. 15
8.4 Design constraints p. 15
9 Feasibility aspects for other channels p. 16
10 Development phases p. 16
11 Open issues and risks p. 17
12 Conclusions p. 17
13 Recommendations p. 17
A Executive Summary and Recommendations p. 18
A.1 Introduction p. 18
A.2 Benefits p. 18
A.3 Performance p. 18
A.4 Risk areas p. 18
A.5 Recommendations p. 18
B Draft working assumption for performance specification p. 20
B.1 Introduction p. 20
B.2 General (this section may be moved from this document) p. 20
B.3 Static conditions p. 20
B.4 Dynamic conditions p. 21
B.5 Additional speech codec performance requirements and objectives p. 21
B.6 Open Issues p. 22
C Draft working assumption for design constraints p. 23
D Implementation requirements (draft) p. 25
E Draft schedule of AMR-WB development p. 26
F Work item description for AMR wideband (AMR-WB) p. 27
F.1 AMR-Wideband codec p. 27
F.1.1 SMG Work Area p. 27
F.1.2 Linked work items p. 27
F.1.3 Justification p. 27
F.1.4 Service Aspects p. 27
F.1.5 MMI-Aspects p. 27
F.1.6 Charging Aspects p. 27
F.1.7 Security Aspects p. 27
F.1.8 Impacts p. 28
F.1.9 Expected Output and Timescales (to be updated at each plenary) p. 28
F.1.10 Work item rapporteurs p. 28
F.1.11 Work item leadership p. 28
F.1.12 Supporting companies p. 28
F.1.13 Others p. 28
$ Change history p. 29
