SIST EN 300 723 V6.1.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 6.1.1 Release 1997)
- Abstract
CRs from SMG#32
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
- Mandate
- T-172
SIST EN 300 723 V6.1.1:2003 is the Slovenian adoption of ETSI EN 300 723 V6.1.1, a European standard from ETSI for Digital cellular telecommunications system (Phase 2+) GSM Enhanced Full Rate (EFR) speech processing functions. It gives a general description of the EFR speech traffic-channel processing used in GSM, including transcoding, DTX, VAD, comfort noise, lost-frame handling, codec homing, and an alternative implementation based on the Adaptive Multi Rate 12.2 kbit/s mode. Engineers, equipment vendors, and test labs use it as the map to the detailed GSM speech-processing specifications.
What does SIST EN 300 723 V6.1.1:2003 specify?
SIST EN 300 723 V6.1.1:2003 specifies the overall EFR speech processing framework and points to the detailed ENs that define each function. Clause 1 states that it is an introduction to the companion GSM 06.60, GSM 06.61, GSM 06.62, GSM 06.81, and GSM 06.82 ENs.
The document is organized into a general overview and one clause each for the main speech-processing functions, followed by an informative annex.
| Annex | What it covers |
|---|---|
| Annex A | Change Request History |
What are the key requirements of SIST EN 300 723 V6.1.1:2003?
SIST EN 300 723 V6.1.1:2003 is mainly a coordination document, but its clauses describe how the EFR speech path is structured and how the linked functions behave in practice.
Speech transcoding and bit rates
Clause 5 describes the EFR speech transcoding chain. The speech encoder takes 13-bit uniform PCM input and produces 244-bit coded speech frames at 8 000 sample/s, with channel coding in GSM 05.03 leading to a 456-bit block and a gross bit rate of 22,8 kbit/s. In practice, this tells implementers what sample format to accept, what coded frame size to produce, and where channel coding fits.
Clause 5 also identifies ACELP as the coding scheme and points to GSM 06.53 and GSM 06.54 for C code and digital test sequences. That matters because compliance is checked by matching specified code behavior against known vectors.
DTX, VAD, and comfort noise
Clause 6 explains Discontinuous Transmission (DTX) for EFR speech channels. The transmitters are only active for frames with useful information, which reduces battery use in the Mobile Station (MS) and lowers average interference on the radio link.
Clause 6 also ties together the DTX handlers, the Voice Activity Detector (VAD), the background-noise evaluation, and the comfort-noise generation. Silence Descriptor (SID) frames carry comfort-noise information, and the Speech (SP) flag tells the Radio SubSystem (RSS) whether the frame carries speech or SID information. In practice, implementers need to generate SID frames at speech-burst ends and during pauses so the receiver can rebuild a stable background noise.
Clause 7 says the VAD uses parameters from the EFR speech encoder to decide whether each 20 ms frame contains speech. The VAD flag feeds the TX DTX handler but does not directly key the transmitter. This separation matters because the decision logic and the actual radio control are handled in different functions.
Clause 8 describes comfort-noise insertion on the receive side. It covers background-noise evaluation, SID encoding and decoding, and comfort-noise generation, all to reduce the abrupt noise drop that would otherwise occur when transmission stops.
Lost frames and codec homing
Clause 9 covers lost speech frame substitution and muting. An isolated lost speech frame is replaced by a predicted frame, while several consecutive lost frames are muted. For users, this means the receiver masks short errors smoothly but makes longer interruptions audible instead of inserting silence frames.
Clause 10 defines codec homing for the transcoder, VAD, DTX system, and comfort-noise parts. The functions are bit exact, and special inband homing frames can force the modules into their home states. This supports type approval, infrastructure testing, and remote operation and maintenance.
Alternative implementation
Clause 11 allows an alternative EFR implementation based on the Adaptive Multi Rate 12.2 kbit/s mode. The alternative is functionally equivalent, but it still has to use GSM 06.81 for DTX transmission format and GSM 06.62 for comfort-noise generation. Clause 11 also notes an additional 5 ms look-ahead delay.
What terms does SIST EN 300 723 V6.1.1:2003 define?
- ACELP - Algebraic Code Excited Linear Prediction, the speech-coding method used for EFR.
- DTX - Discontinuous Transmission, a mode that sends only frames with useful information.
- VAD - Voice Activity Detector, the function that decides whether a frame contains speech.
- SID - SIlence Descriptor frame, used to carry comfort-noise information during pauses.
- SP - Speech flag, which marks whether transmitted information is speech or SID data.
- TAF - Time Alignment Flag, which marks the position of the SID frame within the SACCH multiframe.
- BFI - Bad Frame Indication, a flag used when received frame quality is bad.
Who uses SIST EN 300 723 V6.1.1:2003?
SIST EN 300 723 V6.1.1:2003 is used by GSM speech-codec designers, MS and infrastructure equipment developers, and test laboratories. It is also relevant for type approval of mobile terminal equipment and infrastructure equipment, and for remote control and testing in operation and maintenance.
What changed in SIST EN 300 723 V6.1.1:2003 from the previous edition?
Annex A records that Version 6.1.0 added the alternative EFR implementation using the AMR 12.2 mode. The history also shows that Version 6.1.1 is the publication update of that release.
Which standards are used with SIST EN 300 723 V6.1.1:2003?
| Standard | What it contributes |
|---|---|
| GSM 01.04 | Abbreviations and acronyms used in the GSM series |
| GSM 03.50 | Transmission planning aspects of the speech service in the GSM PLMN system |
| GSM 05.03 | Channel coding used for the coded speech block |
| GSM 06.53 | ANSI-C code for the GSM Enhanced Full Rate speech codec |
| GSM 06.54 | Digital test sequences for verifying the EFR speech codec and related functions |
| GSM 06.60 | Enhanced Full Rate speech transcoding |
| GSM 06.61 | Substitution and muting of lost frame for EFR speech traffic channels |
| GSM 06.62 | Comfort noise aspects for EFR speech traffic channels |
| GSM 06.81 | Discontinuous transmission for EFR speech traffic channels |
| GSM 06.82 | Voice Activity Detector for EFR speech traffic channels |
| TS 26.071 | The 12.2 kbit/s Adaptive Multi Rate mode used for the alternative implementation |
What does the SIST EN 300 723 V6.1.1:2003 document contain?
The document contains a reference configuration figure for the audio processing path between the MS and the PSTN interface, plus clause-by-clause summaries of the EFR speech functions. It also lists the abbreviations used in the GSM context and points to the detailed companion ENs for the algorithms, code, and test sequences. Annex A gives the change request history, and the foreword states the release/version policy and the national transposition dates.
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Frequently Asked Questions
SIST EN 300 723 V6.1.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 6.1.1 Release 1997)". This standard covers: CRs from SMG#32
CRs from SMG#32
SIST EN 300 723 V6.1.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 723 V6.1.1:2003 is associated with the following European legislation: Standardization Mandates: T-172. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 723 V6.1.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 6.1.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 723 Version 6.1.1SIST EN 300 723 V6.1.1:2003en01-december-2003SIST EN 300 723 V6.1.1:2003SLOVENSKI
STANDARD
FOR MOBILE COMMUNICATIONSR
ETSI ETSI EN 300 723 V6.1.1 (2000-11)2(GSM 06.51 version 6.1.1 Release 1997)
Reference REN/SMG-110651Q6R1 Keywords Digital cellular telecommunications system, Global System for Mobile communications (GSM) 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
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Important notice 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 Document 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 the current status of this and other ETSI documents is available at http://www.etsi.org/tb/status/ If you find errors in the present document, send your comment to: editor@etsi.fr Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2000. All rights reserved.
ETSI ETSI EN 300 723 V6.1.1 (2000-11)3(GSM 06.51 version 6.1.1 Release 1997) Contents Intellectual Property Rights.4 Foreword.4 1 Scope.5 2 References.5 3 Definitions and abbreviations.6 3.1 Definitions.6 3.2 Abbreviations.6 4 General.6 5 Enhanced Full Rate speech channel transcoding.8 6 Enhanced Full Rate speech channel discontinuous transmission (DTX).8 7 Enhanced Full Rate speech channel Voice Activity Detection (VAD).9 8 Enhanced Full Rate speech channel comfort noise insertion.9 9 Enhanced Full Rate speech channel lost speech frame substitution and muting.9 10 Enhanced Full Rate codec homing.10 11 Alternative Enhanced Full Rate implementation using the Adaptive Multi Rate 12.2 kbit/s mode.10 Annex A (informative): Change Request History.11 History.12
ETSI ETSI EN 300 723 V6.1.1 (2000-11)4(GSM 06.51 version 6.1.1 Release 1997) 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 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://www.etsi.org/ipr). 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 become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Special Mobile Group (SMG). The present document introduces the Enhanced Full Rate (EFR) speech traffic channels within the digital cellular telecommunications system. The contents of the present document is subject to continuing work within SMG and may change following formal SMG approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of release date and an increase in version number as follows: Version 6.x.y where: 6 indicates Release 1997 of GSM Phase 2+. x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. y the third digit is incremented when editorial only changes have been incorporated in the specification.
National transposition dates Date of adoption of this EN: 24 November 2000 Date of latest announcement of this EN (doa): 28 February 2001 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 August 2001 Date of withdrawal of any conflicting National Standard (dow): 31 August 2001
ETSI ETSI EN 300 723 V6.1.1 (2000-11)5(GSM 06.51 version 6.1.1 Release 1997) 1 Scope The present document is an introduction to GSM 06.60 [6], GSM 06.61 [7], GSM 06.62 [8], GSM 06.81 [9] and GSM 06.82 [10] ENs dealing with the speech processing functions in the Enhanced Full Rate channel of the GSM system. A general overview of the speech processing functions is given, with reference to the ENs where each function is specified in detail. 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, edition number, version number, etc.) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. • A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. • For this Release 1997 document, references to GSM documents are for Release 1997 versions (version 6.x.y). [1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms". [2] GSM 03.50: "Digital cellular telecommunications system (Phase 2+); Transmission planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system". [3] GSM 05.03: "Digital cellular telecommunications system (Phase 2+); Channel coding". [4] GSM 06.53: "Digital cellular telecommunications system (Phase 2+); ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec".
[5] GSM 06.54: "Digital cellular telecommunications system (Phase 2+); Test vectors for the GSM Enhanced Full Rate (EFR) speech codec". [6] GSM 06.60: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR) speech transcoding". [7] GSM 06.61: "Digital cellular telecommunications system (Phase 2+); Substitution and muting of lost frame for Enhanced Full Rate (EFR) speech traffic channels". [8] GSM 06.62: "Digital cellular telecommunications system (Phase 2+); Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels". [9] GSM 06.81: "Digital cellular telecommunications system (Phase 2+); Discontinuous transmission (DTX) for Enhanced Full Rate (EFR) speech traffic channels". [10] GSM 06.82: "Digital cellular telecommunications system (Phase 2+); Voice Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels". SIST EN 300 723 V6.1.1:2003
ETSI ETSI EN 300 723 V6.1.1 (2000-11)6(GSM 06.51 version 6.1.1 Release 1997) 3 Definitions and abbreviations 3.1 Definitions Definition of terms used in the present document can be found in GSM 06.60 [6], GSM 06.61 [7], GSM 06.62 [8], GSM 06.81 [9] and GSM 06.82 [10]. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ACELP Algebraic Code Excited Linear Prediction BFI Bad Frame Indication
BSS Base Station System CCITT Comité Consultatif International Télégraphique et Téléphonique DTX Discontinuous Transmission ETS European Telecommunication Standard GSM Global System for Mobile communications MS Mobile Station PCM Pulse Code Modulated PLMN Public Land Mobile Network
PSTN Public Switched Telephone Network RF Radio Frequency RSS Radio SubSystem RX Receive SACCH Slow Associated Control CHannel SID SIlence Descriptor SP flag SPeech flag TAF Time Alignment Flag TX Transmit For abbreviations not given in this clause, see GSM 01.04 [1]. 4 General Figure 1 presents a reference configuration where the various speech processing functions are identified. In this figure, the relevant Standards for each function are also indicated. In figure 1, the audio parts including analogue to digital and digital to analogue conversion are included, to show the complete speech path between the audio input/output in the Mobile Station (MS) and t
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