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1、 ETSI EN 300 175-8 V2.1.1 (2007-08) European Standard (Telecommunications series) Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech coding and transmission ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 2 Reference REN/DECT-000241-8 Keywords DECT, radio, mobility, T
2、DD, TDMA, IMT-2000, audio, speech, codec, 7 kHz 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 7803/88 Important notice
3、 Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable D
4、ocument Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on t
5、he current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be r
6、eproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2007. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its M
7、embers. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 3 Contents Intellectual Pr
8、operty Rights6 Foreword.6 1 Scope7 2 References7 3 Definitions, symbols and abbreviations .9 3.1 Definitions9 3.2 Symbols9 3.3 Abbreviations.9 4 Configurations10 4.1 Reference configuration.10 4.1.1 Basic configuration.10 4.1.2 Portable Part (PP) .11 4.1.2.1 Functional organization.11 4.1.2.2 Volume
9、 control .12 4.1.3 Fixed Part (FP)12 4.1.3.1 Digital interface.12 4.1.3.2 Analogue interface13 4.1.3.3 FP adaptive volume control 13 4.2 Test configurations.13 5 Encoding.13 5.1 32 kbit/s full term (ADPCM) G.726.13 5.1.1 Algorithm13 5.1.2 Bit sequence14 5.1.3 Characteristics of G.726 ADPCM codec14 5
10、.2 64 kbit/s PCM G.71114 5.2.1 Algorithm14 5.2.2 Bit sequence14 5.2.3 Characteristics of G.711 PCM codec14 5.2.4 Automatic detection of FAX/modem tone and switch to G.711.15 5.3 Wideband speech codec G.722 at 64 kbit/s15 5.3.1 Algorithm15 5.3.2 Bit sequence15 5.3.3 Characteristics of G.722 wideband
11、codec.15 5.3.4 Optional Packet Loss Concealment algorithm (PLC).16 5.4 Wideband speech codec G.729.1 up to 32 kbit/s16 5.4.1 Algorithm16 5.4.2 Bit sequence16 5.4.3 Characteristics of G.729.1 codec16 5.4.4 Packet Loss Concealment algorithm (PLC)17 5.5 Super-wideband MPEG4 speech and audio coding17 5.
12、5.1 Algorithm17 5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec17 5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec18 5.6 Other codings .18 6 Transmission aspects19 6.1 Relative level19 6.2 Acoustic reference level.19 6.3 Volume control.19 7 Speech performance characteristics for 3,1 kHz service19 7.1 PP frequency re
13、sponses19 7.1.1 Sending.19 7.1.2 Receiving20 ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 4 7.2 PP sending and receiving loudness ratings.20 7.2.1 Nominal values.20 7.2.2 User-controlled volume control in PP.20 7.2.3 PP adaptive volume control21 7.2.4 FP adaptive volume control21 7.3 Sidetone21 7.3.1 Tal
14、ker sidetone21 7.3.2 Listener sidetone.22 7.4 Terminal coupling loss.22 7.4.1 Weighted Terminal Coupling Loss (TCLw).22 7.4.1.1 PP for the 3,1 kHz service (PSTN or ISDN).22 7.4.1.2 FP with 4-wire interface22 7.4.1.3 FP with analogue 2-wire interface 23 7.4.1.4 PP for unrestricted 64 kbit/s service23
15、 7.4.2 Stability loss23 7.4.2.1 Requirement23 7.4.2.2 Test conditions23 7.4.2.3 Fixed geometry PP23 7.4.2.4 Variable geometry PP .24 7.5 Distortion24 7.5.1 Sending.24 7.5.2 Receiving24 7.5.3 Sidetone24 7.5.4 Equipment Impairment value for end-to-end transmission planning24 7.6 Out of band signals.24
16、 7.6.1 Sending (discrimination against out of band input signals)24 7.6.2 Receiving (spurious out of band signals)25 7.7 Noise 25 7.7.1 Sending.25 7.7.2 Narrow-band noise25 7.7.3 Receiving25 7.7.4 Level of sampling frequency (receiving)25 7.8 Acoustic shock .25 7.8.1 Continuous signal .25 7.8.2 Peak
17、 signal25 7.9 Delay26 7.9.1 DECT network26 7.9.2 PP26 7.9.3 FP26 7.10 Network echo control.26 7.11 PP ambient noise rejection.27 7.12 Additional requirements for DECT systems provided with a 2-wire PSTN interface27 7.12.1 General27 7.12.1.1 Polarity independence.27 7.12.1.2 Feed Conditions 27 7.12.1
18、.3 Power supply.27 7.12.2 Speech performance characteristics27 7.12.2.1 Sensitivity/frequency response28 7.12.2.2 Sending and Receiving Loudness Ratings (SLR and RLR)28 7.12.2.3 Distortion 28 7.12.2.4 Noise.28 7.12.2.5 Echo Return Loss28 8 Additional features.28 8.1 Loudspeaking and hand-free facili
19、ties28 8.2 Tandem with mobile radio network28 8.2.1 Tandem with GSM .29 8.2.1.1 Network echo control29 8.2.1.2 Terminal coupling loss29 8.2.1.3 The GSM mobile transmitter operates in continuous mode29 8.2.1.4 The GSM mobile transmitter operates in discontinuous mode, DTX.29 8.3 DECT connected to the
20、 GSM fixed network29 ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 5 8.3.1 Network echo control30 8.3.2 Terminal coupling loss30 8.4 Wireless Relay Stations (WRS)30 8.4.1 Modified FP network echo control requirements for implementation of 2 and 3 CRFP links in cascade31 9 Speech performance characteristic
21、s for wideband and super-wideband service31 9.1 Speech performance characteristics for wideband 7 kHz service.31 9.1.1 DECT wideband handsets.31 9.1.2 Other DECT PPs interfaces 31 9.2 Speech performance characteristics for super-wideband (14 kHz) service31 Annex A (informative): Description of “refe
22、rence“ echo control devices.32 A.1 Handset echo32 A.1.1 Overview32 A.1.1.1 Connection to the PSTN/ISDN.32 A.1.1.1.1 Local and national calls.32 A.1.1.1.2 Long distance connections with echo control devices in the PSTN/ISDN, e.g. calls via satellites.32 A.1.1.2 Connection to the GSM network33 A.1.2 I
23、mplementation of the FP echo control function33 A.1.2.1 Suppression threshold.34 A.1.2.2 Static characteristics of activation control34 A.1.2.3 Dynamic characteristics of activation control.34 A.2 Network echo.34 A.2.1 Soft suppressor implementation of requirement 235 A.2.1.1 Static characteristics
24、.36 A.2.1.2 Dynamic characteristics36 A.2.2 Additional echo control for a 2-wire interface of requirement 136 A.2.3 Echo canceller used for both requirements 1 and 237 Annex B (informative): Local loop application .38 B.1 DECT tethered local loop replacement with 2-wire PP end system.38 B.1.1 TCLw r
25、equirements38 B.1.2 Network echo .39 Annex C (informative): GSM Discontinuous Transmission (DTX), and Voice Activity Detection (VAD).40 Annex D (informative): Speech levels in relation to ambient room noise and examples of adaptive volume control settings41 Annex E (informative): Bibliography.42 Ann
26、ex F (informative): Change history.43 History44 ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 6 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
27、 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 is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:
28、/webapp.etsi.org/IPR/home.asp). 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 ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may
29、become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Project Digital Enhanced Cordless Telecommunications (DECT). The present document is part 8 of a multi-part deliverable. Full details of the entire series can be found in
30、part 1 1. Further details of the DECT system may be found in TR 101 178 and ETR 043 (see bibliography). National transposition dates Date of adoption of this EN: 27 July 2007 Date of latest announcement of this EN (doa): 31 October 2007 Date of latest publication of new National Standard or endorsem
31、ent of this EN (dop/e): 30 April 2008 Date of withdrawal of any conflicting National Standard (dow): 30 April 2008 ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 7 1 Scope The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interfa
32、ce (CI). This part of the DECT CI specifies the speech coding and transmission requirements. In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the transmission performance of the analogue information over the digital link. This requires no
33、t only use of a common speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air interface and various other parameters. The present document applies to DECT equipment which includes all the necessary functions to provide real-time two-way sp
34、eech conversation. A 3,1 kHz telephony teleservice conveyed over a DECT link (including Fixed Part (FP) and Portable Part (PP) which is capable of being connected (directly or indirectly) to the public network access point should comply with the requirements in the present document. Tethered fixed p
35、oint local loop applications are not required to comply with the requirements of the present document. The speech performance characteristics defined in the present document typically conform to TBR 008 (see bibliography), which specifies the overall performance between the handset acoustic interfac
36、e and a 64 kbit/s A-law Pulse Code Modulated (PCM) digital network interface. The deviations from TBR 008 are mainly due to the consequences of non-PCM coding and transmission delay. The additional features described in clause 8 are those which are not included in TBR 008, but which are likely to oc
37、cur in a DECT system: analogue interface, loudspeaking and hand-free facilities, tandeming with a mobile radio network. Headsets are not covered by the present specifications. For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analogue interface, the additional
38、 requirements, which are implemented in the FP, have as much as possible been aligned with TBR 038 (see bibliography). A summary of the control and the use of the DECT echo control functions, to guide on need for options to manufacturers and installers, is found in annex A. Information concerning te
39、st methods can be found in EN 300 176 3. The test methods take into account that DECT is a digital system. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancement
40、s. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subse
41、quent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the t
42、ime of publication ETSI cannot guarantee their long term validity. 1 ETSI EN 300 175-1: “Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 1: Overview“. ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 8 2 ETSI EN 300 175-5: “Digital Enhanced Cordless Telecommunications (DECT);
43、 Common Interface (CI); Part 5: Network (NWK) layer“. 3 ETSI EN 300 176 (all parts): “Digital Enhanced Cordless Telecommunications (DECT); Test specification; (Part 1: Radio; Part 2: Speech)“. 4 Void. 5 Void. 6 Void. 7 Void. 8 ITU-T Recommendation G.701: “Vocabulary of digital transmission and multi
44、plexing, and pulse code modulation (PCM) terms“. 9 ITU-T Recommendation G.726: “40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code Modulation (ADPCM)“. 10 Void. 11 ITU-T Recommendation P.10: “Vocabulary for performance and quality of service“. 12 ITU-T Recommendation P.340: “Transmission charact
45、eristics and speech quality parameters of hands-free terminals“. 13 Void. 14 ITU-T Recommendation G.111: “Loudness Ratings (LRs) in an international connection“. 15 ETSI ETS 300 540: “Digital cellular telecommunications system (Phase 2) (GSM); Transmission planning aspects of the speech service in t
46、he GSM Public Land Mobile Network (PLMN) system (GSM 03.50)“. 16 ITU-T Recommendation G.711 (11/1988): “Pulse Code Modulation (PCM) of voice frequencies“. 17 ITU-T Recommendation G.722 (11/1988): “7 kHz audio - coding within 64 kbit/s“. 18 ITU-T Recommendation G.729.1 (05/2006): “G.729 based Embedde
47、d Variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729“. 19 ISO/IEC 14496-3 (2005) Amd 1 (2007): “Low delay AAC profile“. 20 ISO/IEC 14496-3 (2005): “Information technology - Coding of audio-visual objects - Part 3: Audio“. 21 ITU-T Recommendation G.722
48、Appendix III: “A high quality packet loss concealment algorithm for G.722“. 22 ITU-T Recommendation G.722 Appendix IV: “A low-complexity algorithm for packet loss concealment with G.722“. 23 ITU-T Recommendation P.311 (06/2005): “Transmission characteristics for wideband (150-7000 Hz) digital handse
49、t telephones“. . 24 ITU-T Recommendation P.341 (06/2005): “Transmission characteristics for wideband (150-7000 Hz) digital hands free telephony terminals“. ETSI ETSI EN 300 175-8 V2.1.1 (2007-08) 9 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: super-wideband speech: voice service with enhanced quality compared to PCM G.711 and allowing the transmission of a maximum vocal frequency of at least 14 kHz wideband speech