SIST EN 300 723 V7.1.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 7.1.1 Release 1998)
- 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 V7.1.1:2003 is the Slovene adoption of ETSI EN 300 723 V7.1.1 for Digital cellular telecommunications system (Phase 2+) (GSM) Enhanced Full Rate (EFR) speech processing functions. It gives a general description of the EFR speech path and points to the detailed GSM standards that define transcoding, discontinuous transmission, Voice Activity Detection, comfort noise, lost-frame handling, codec homing and an alternative implementation. It is aimed at GSM equipment designers, test laboratories, and teams responsible for type approval and operation or maintenance testing.
What does SIST EN 300 723 V7.1.1:2003 specify?
SIST EN 300 723 V7.1.1:2003 specifies the overall EFR speech processing framework for GSM Phase 2+ and shows how the individual speech functions fit together. It is an introduction and map to the detailed ENs, rather than the place where each algorithm is fully defined.
The document is organized into scope, references, definitions and abbreviations, a general overview, and clauses for each major speech-processing function. The main technical clauses are:
- speech channel transcoding
- DTX
- VAD
- comfort noise insertion
- lost speech frame substitution and muting
- codec homing
- an alternative EFR implementation using the Adaptive Multi Rate 12.2 kbit/s mode
Annex A is informative and gives the change request history.
What are the key requirements of SIST EN 300 723 V7.1.1:2003?
SIST EN 300 723 V7.1.1:2003 ties the EFR speech chain to a reference configuration in Clause 4 and Figure 1. In practice, this helps implementers trace how audio enters the Mobile Station (MS), how it reaches the Public Switched Telephone Network (PSTN), and where the Radio SubSystem (RSS) interacts with the speech functions.
Clause 5 describes EFR transcoding between 13-bit uniform Pulse Code Modulated (PCM) speech blocks and encoded speech frames, with the ACELP coding method. This matters because implementers must keep the bit-exact codec behavior aligned with the GSM speech format and the related channel coding chain.
Clause 6 defines discontinuous transmission (DTX). The transmit side sends frames only when they carry useful information, which helps reduce battery use and average interference, while the receive side must handle SID frames and comfort noise updates correctly.
Clause 7 defines Voice Activity Detection (VAD). The VAD uses parameters from the EFR encoder to decide whether a 20 ms frame contains speech, and its output feeds the TX DTX handler. In practice, this means the VAD informs transmission control but does not key the transmitter directly.
Clause 8 covers comfort noise insertion. The receiver must recreate background noise during speech pauses so that the noise level does not jump abruptly when transmission stops. This avoids the “noise contrast effect” and keeps pauses sounding natural.
Clause 9 covers lost speech frame substitution and muting. A single lost speech frame is predicted from earlier frames, while repeated losses require muting; silence frames are not permitted. For users, this is the part that hides transmission errors and frame stealing as much as possible.
Clause 10 covers codec homing. The bit-exact parts of the system must return the same output for the same input when they start from the same home state, and special in-band homing frames can force that state remotely. This supports type approval, maintenance, and remote testing.
Clause 11 allows an alternative implementation based on the Adaptive Multi Rate 12.2 kbit/s mode. The alternative must still use the GSM DTX transmission format and comfort noise generation, and it adds a 5 ms look-ahead delay.
What terms does SIST EN 300 723 V7.1.1:2003 define?
- ACELP (Algebraic Code Excited Linear Prediction) - The speech coding method used by the EFR codec.
- DTX (Discontinuous Transmission) - A mode that switches transmission on only for frames that carry useful speech information.
- VAD (Voice Activity Detector) - The function that decides whether a coder frame contains speech.
- SID frame (Silence Descriptor frame) - The frame that carries noise-related parameters during pauses.
- SP flag (Speech flag) - The flag that indicates whether information bits are speech or SID information.
- BFI (Bad Frame Indication) - The signal that a received frame was bad or lost.
- TAF (Time Alignment Flag) - The flag that marks the position of a SID frame within the SACCH multiframe.
Who uses SIST EN 300 723 V7.1.1:2003?
SIST EN 300 723 V7.1.1:2003 is used by GSM speech codec developers, mobile station and infrastructure engineers, conformance test laboratories, and quality or approval teams. It is also relevant for operation and maintenance personnel because it defines the homing and remote testing behavior used for controlled checks.
What changed in SIST EN 300 723 V7.1.1:2003 from the previous edition?
Annex A records the change request history leading to this version. The history shows the document progressing through publication, Release 1996 and Release 1997 versions, Version 7.0.2, Version 7.1.0 and then Version 7.1.1. It also records the addition of mu-law (PCS 1900) in Figure 1 and Clause 5, and the alternative EFR implementation using the AMR 12.2 mode.
Which standards are used with SIST EN 300 723 V7.1.1:2003?
| Reference | What it contributes |
|---|---|
| GSM 01.04 | Abbreviations and acronyms not defined in this clause. |
| GSM 03.50 | Speech-service transmission planning and the audio parts. |
| GSM 05.03 | Channel coding for the encoded speech blocks. |
| GSM 06.53 | ANSI-C code for the EFR speech codec. |
| GSM 06.54 | Digital test vectors for codec and VAD compliance. |
| GSM 06.60 | EFR speech transcoding and codec homing frames. |
| GSM 06.61 | Lost speech frame substitution and muting. |
| GSM 06.62 | Comfort noise aspects and SID handling. |
| GSM 06.81 | DTX for EFR speech traffic channels. |
| GSM 06.82 | VAD for EFR speech traffic channels. |
| TS 26.071 | The 12.2 kbit/s AMR mode used for the alternative implementation. |
What does the SIST EN 300 723 V7.1.1:2003 document contain?
The document contains Figure 1 with the reference speech-processing configuration and the speech path between the MS and the PSTN. It also contains the clause-by-clause overview of transcoding, DTX, VAD, comfort noise, lost-frame handling, codec homing and the optional AMR-based implementation.
It includes definitions and abbreviations that support the GSM speech-chain terminology used throughout the clauses. Annex A gives the recorded change request history.
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Frequently Asked Questions
SIST EN 300 723 V7.1.1:2003 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 7.1.1 Release 1998)". This standard covers: CRs from SMG#32
CRs from SMG#32
SIST EN 300 723 V7.1.1:2003 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 V7.1.1:2003 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 V7.1.1:2003 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 7.1.1 Release 1998)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 7.1.1SIST EN 300 723 V7.1.1:2003en01-december-2003SIST EN 300 723 V7.1.1:2003SLOVENSKI
STANDARD
FOR MOBILE COMMUNICATIONSR
ETSI ETSI EN 300 723 V7.1.1 (2000-11)2(GSM 06.51 version 7.1.1 Release 1998)
Reference REN/SMG-110651Q7R1 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 V7.1.1 (2000-11)3(GSM 06.51 version 7.1.1 Release 1998) 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).8 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.9 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 V7.1.1 (2000-11)4(GSM 06.51 version 7.1.1 Release 1998) 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 7.x.y where: 7 indicates Release 1998 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 V7.1.1 (2000-11)5(GSM 06.51 version 7.1.1 Release 1998) 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 1998 document, references to GSM documents are for Release 1998 versions (version 7.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 V7.1.1:2003
ETSI ETSI EN 300 723 V7.1.1 (2000-11)6(GSM 06.51 version 7.1.1 Release 1998) 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 the digital interface of the PSTN. The detailed specification of the audio parts are contained in GSM 03.50 [2]. These aspects are only
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