1、 ETSI TR 103 590 V1.1.1 (2018-09) Digital Enhanced Cordless Telecommunications (DECT); Study of Super Wideband Codec in DECT for narrowband, wideband and super-wideband audio communication including options of low delay audio connections ( 10 ms framing) TECHNICAL REPORT ETSI ETSI TR 103 590 V1.1.1
2、(2018-09) 2Reference DTR/DECT-00316 Keywords codec, DECT, superwideband ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N
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9、(2018-09) 3Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Investigations on an en
10、hanced DECT codec 8g34.1 Overview 8g34.2 Design constraints/features to be supported . 9g34.2.1 Improved exploitation on DECT slots 9g34.2.2 Transmission latency 9g34.2.3 Supported sampling rates, audio bandwidths and sample depths . 9g34.2.4 Support for music streaming . 9g34.2.5 Packet loss concea
11、lment . 9g34.2.6 Low codec complexity 9g34.3 Investigations on impact of block-based codec 10g34.3.1 Probability and distribution of bit errors . 10g34.3.1.1 Normal slots - transmission error profile I 10g34.3.1.2 Long slots - transmission error profile II . 13g34.3.2 Study of CRC/FEC protection sch
12、emes 16g34.3.2.1 Static rates . 16g34.3.2.2 Dynamic rate switching of source and channel coder . 19g34.3.2.2.1 General 19g34.3.2.2.2 Graceful degradation at DECT range limit 19g34.3.2.2.3 Audio bandwidth switching . 19g34.3.2.2.4 Potential channel coder configuration . 20g34.3.3 Comparison to curren
13、t DECT codecs . 20g34.3.4 Usability of IN_minimum_delay service . 20g34.4 Evaluation results of LC3 . 21g34.4.1 Audio quality evaluation for clean channels . 21g34.4.1.1 NB/WB experiment tandeming I . 21g34.4.1.1.1 Setup 21g34.4.1.1.2 Observations 23g34.4.1.2 SSWB/SWB experiment tandeming I . 23g34.
14、4.1.2.1 Setup 23g34.4.1.2.2 Observations 25g34.4.1.3 WB/SWB experiment on short frame size 25g34.4.1.3.1 Setup 25g34.4.1.3.2 Observations 26g34.4.2 Audio quality evaluation for error prone channels . 26g34.4.2.1 Reference conditions . 26g34.4.2.2 Codec characterization depending on PLR . 27g34.4.2.2
15、.1 Setup 27g34.4.2.2.2 Observations 28g34.4.2.3 Codec characterization depending on PLR and BER 28g34.4.2.3.1 Setup 28g34.4.2.3.2 Observations 31g34.5 Integration of LC3 in existing DECT infrastructure . 31g3ETSI ETSI TR 103 590 V1.1.1 (2018-09) 44.5.1 General 31g34.5.2 High-level codec description
16、31g34.5.2.1 Codec overview . 31g34.5.2.2 Audio channels 31g34.5.2.3 Complexity 31g34.5.2.4 Audio bandwidth detection . 31g34.5.3 High-level options for LC3 integration into the DECT specifications 32g34.5.3.1 Fixed bitrate, multi-mode or adaptive multi-mode operation 32g34.5.3.2 Codec negotiation at
17、 session setup 33g34.5.3.3 Codec mode set negotiation 33g34.5.3.4 Adaptation signalling 34g34.5.3.5 Audio bandwidth selection/adaptation 35g34.5.3.6 DTX 35g34.5.3.7 Acoustic front-end . 36g34.5.3.8 VoIP, RTP payload format 36g34.5.3.9 Backwards compatibility . 36g34.5.3.10 Interworking with external
18、 networks and devices . 36g34.5.3.11 Repeater operation, relays . 37g35 Conclusions 37g3Annex A: Change History . 39g3History 40g3ETSI ETSI TR 103 590 V1.1.1 (2018-09) 5Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been decl
19、ared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which
20、 is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in
21、ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for
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23、word This Technical Report (TR) has been produced by ETSI Technical Committee Digital Enhanced Cordless Telecommunications (DECT). Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in c
24、lause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Since the introduction of additional codecs in New Generation DECT i.5 in 2007, wideband services have be
25、en widely established for fixed line, mobile and OTT communications networks. This trend is gaining even more momentum by services using cutting edge codecs like 3GPP EVS and the upcoming new Bluetooth codec by offering super-wideband audio bandwidth. NOTE: Bluetooth is the trade name of a wireless
26、technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2,4 - 2,485 GHz) from fixed and mobile devices, and building personal area networks (PANs), owned by the Bluetooth Special Interest Group. This information is given for the conve
27、nience of users of the present document and does not constitute an endorsement by ETSI of the technology named. Equivalent technologies may be used if they can be shown to lead to the same results. Recent market research from several relevant DECT infrastructure providers indicates a demand for upgr
28、ading DECT services and standard with additional features enabled by evolved speech and audio codecs. The present document collects performance requirements to add a real benefit to current and upcoming DECT applications and evaluates the Low Complexity Communication Codec (LC3) on suitability for t
29、his as well as discusses possible adaptations for DECT environments in terms of error protection and signalling. ETSI ETSI TR 103 590 V1.1.1 (2018-09) 61 Scope The present document provides a study of technical updates to the DECT standard to enable super wideband (SWB) audio calls in existing DECT
30、slot formats as well as technical improvements to narrowband (NB) andg3wideband (WB) calls. All required change requests are listed and defined for the different DECT layers to enable high quality audio communication between DECT FP and PP including DECT repeaters (relays). The study includes an inv
31、estigation on FEC for block-based codecs. Information is provided on the audio quality in some DECT use cases for NB, WB and SWB and potential improvements by a new audio codec are studied. 2 References 2.1 Normative references Normative references are not applicable in the present document. 2.2 Inf
32、ormative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendment
33、s) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long-term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular s
34、ubject area. i.1 ETSI EN 300 175-1: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 1: Overview“. i.2 ETSI EN 300 175-8: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission“. i.3 EP2901594B1:
35、“Error Detection for sub-band ADPCM encoded sound signal“. i.4 ETSI EN 300 175-3: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 3: Medium Access Control (MAC) layer“. i.5 ETSI TS 102 527-3: “Digital Enhanced Cordless Telecommunications (DECT); New Generation DECT;
36、 Part 3: Extended wideband speech services“. i.6 ETSI EN 300 700: “Digital Enhanced Cordless Telecommunications (DECT); Wireless Relay Station (WRS)“. i.7 ETSI EN 300 175-5: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 5: Network (NWK) layer“. i.8 ETSI EN 300 176
37、-2: “Digital Enhanced Cordless Telecommunications (DECT); Test specification; Part 2: Audio and speech“. i.9 Recommendation ITU-T P.863 (09-2014): “Perceptual objective listening quality assessment“. i.10 Recommendation ITU-T P.800 (08-1996): “Methods for subjective determination of transmission qua
38、lity“. i.11 Recommendation ITU-T G.191 (03-1996): “Software tools for speech and audio coding standardization“ . i.12 Recommendation ITU-T G.722 (09-2012): “7 kHz audio-coding within 64 kbit/s“. ETSI ETSI TR 103 590 V1.1.1 (2018-09) 7i.13 Recommendation ITU-T G.726 (12-1990): “40, 32, 24, 16 kbit/s
39、Adaptive Differential Pulse Code Modulation (ADPCM)“. i.14 ETSI TS 126 071: “Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Mandatory speech CODEC speech processing functions; AMR speech Codec; General description (3GPP TS 26.071)
40、“. i.15 ETSI TS 126 171: “Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description (3GPP TS 26.171)“. i.16 ETSI TS 126 441:
41、“Universal Mobile Telecommunications System (UMTS); LTE; Codec for Enhanced Voice Services (EVS); General overview (3GPP TS 26.441)“. i.17 SIG Bluetooth Hands-Free Profile 1.7.1. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given
42、 in ETSI EN 300 175-1 i.1 and the following apply: Fullband (FB): speech or audio sampled at 48 kHz Fullband, compact disc (FBCD): speech or audio sampled at 44,1 kHz Narrowband (NB): speech or audio sampled at 8 kHz Semi-Super Wideband (SSWB): speech or audio sampled at 24 kHz Super Wideband (SWB):
43、 speech or audio sampled at 32 kHz Wideband (WB): speech or audio sampled at 16 kHz 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: 3GPP 3rdGeneration Partnership Project ACR Absolute Category Rating NOTE: See Recommendation ITU-T P.800 i.10. AMR Adapti
44、ve Multi-Rate, NOTE: See ETSI TS 126 071 i.14. AMR-WB Adaptive Multi-Rate Wideband NOTE: See ETSI TS 126 171 i.15. BCH Bose-Chaudhuri-Hocquenghem BER Bit Error Rate CELT Constrained Energy Lapped Transform CMR Codec Mode Request CNG Comfort Noise Generation CRC Cyclic Redundancy Check CS Circuit Swi
45、tched DECT Digital Enhanced Cordless Telecommunications ETSI ETSI TR 103 590 V1.1.1 (2018-09) 8DSP Digital Signal Processor DTX Discontinuous Transmission EP Error ProtectionETSI European Telecommunications Standards Institute EVS Enhanced Voice Service NOTE: See ETSI TS 126 441 i.16. FB Fullband FB
46、CD Fullband Compact Disc FEC Forward Error Correction FER Frame Erasure Rate FP Fixed Part (DECT bas station) FT Frame Type GFSK Gaussian Frequency-Shift Keying GSM Global System for Mobile Communications IETF Internet Engineering Task Force INAhigher layer Information channel (unprotected), minimum
47、 delay operation NOTE: See ETSI TS 102 527-3 i.5. INBhigher layer Information channel (unprotected), normal delay operation NOTE: See ETSI TS 102 527-3 i.5. IP Internet Protocol LAN Local Area Network LC3 Low Complexity Communication Codec MIPS Million Instructions Per Second MNRU Modulated Noise Re
48、ference Unit MOS-LQO Mean Opinion Score - Listening Quality Objective mSBC modified Subband Coding NOTE: See i.17. NB Narrowband OTT Over-The-Top content PLC Packet Loss ConcealmentPLR Packet Loss Rate PP Portable Part (DECT handset) RAM Random-Access Memory RSSI Received Signal Strength Indicator R
49、TP Real-Time Protocol SSWB Semi-Super Wideband STL Software Tool Library SWB Super Wideband VoIP Voice over Internet Protocol WB Wideband WMOPS Weighted Millions of Operations Per Second WRS Wireless Relay Station 4 Investigations on an enhanced DECT codec 4.1 Overview The investigations are organized as follows: 1) Definition of general required codec features (clause 4.2). 2) Study on error profiles and protection schemes for DECT systems (clause 4.3). ETSI ETSI TR 103 590 V1.1.1 (2018-09) 93) Characterization of the LC3
