SIST ETS 300 723 E2:2003
(Main)Digital cellular telecommunications system; Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 5.2.1)
General Information
- 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
Overview
SIST ETS 300 723 E2:2003 outlines the general description of Enhanced Full Rate (EFR) speech processing functions for the digital cellular telecommunications system, specifically within the context of GSM (Global System for Mobile Communications) networks. This standard, aligned with GSM 06.51 version 5.2.1 and ETS 300 723 Edition 2, is maintained by the Slovenski inštitut za standardizacijo (SIST) and harmonized with European Telecom Standards Institute (ETSI) documents.
The purpose of this standard is to deliver high-quality, efficient speech processing in GSM mobile communication systems through the EFR codec, a technology that balances voice fidelity with spectrum and operational efficiency. It serves as an introduction and overview, referencing several related standards for the in-depth technical details and compliance requirements regarding EFR transcoding, Voice Activity Detection (VAD), Discontinuous Transmission (DTX), comfort noise insertion, and frame loss management.
Key Topics
EFR Speech Channel Transcoding: Provides an overview of how speech is digitized and encoded using the Enhanced Full Rate codec, facilitating efficient speech transmission between mobile stations and Public Switched Telephone Network (PSTN) interfaces. Transcoding is based on the Algebraic Code Excited Linear Prediction (ACELP) technique.
Discontinuous Transmission (DTX): Explains the importance of transmitting voice data only when speech is present, leading to lower power consumption in mobile stations and reduced radio interference-key benefits for mobile network operators and end users.
Voice Activity Detection (VAD): Details the function that differentiates between active speech and silence. Proper detection ensures optimal operation of DTX and efficient bandwidth utilization.
Comfort Noise Insertion: Describes the mechanisms for generating artificial background noise during silence periods, enhancing user experience by avoiding unnatural silences or abrupt audio changes.
Lost Frame Substitution & Muting: Outlines strategies for maintaining call quality when speech frames are lost due to radio errors, ensuring uninterrupted and intelligible communication.
Codec Homing & Interoperability: Discusses the procedures for resetting coders to predefined states, vital for equipment type approval, maintenance, and remote testing. Also addresses interoperability options using Adaptive Multi Rate (AMR) coders.
Applications
The EFR speech processing features specified in SIST ETS 300 723 E2:2003 are crucial for:
- Mobile Network Operators: Ensuring high quality speech services, efficient spectrum use, and extended battery life for GSM handsets.
- Mobile Device Manufacturers: Implementing EFR-compliant codecs in mobile terminals to meet international GSM requirements and pass type approval.
- Telecommunications Equipment Vendors: Providing infrastructure elements (base stations, network gateways) that comply with GSM EFR standards for reliable, high-fidelity communication.
- Test and Certification Bodies: Verifying codec operation and voice service quality through standardized test vectors and reference C code implementations.
Related Standards
SIST ETS 300 723 E2:2003 serves as an entry point to several additional GSM standards covering specific technical implementations and tests:
- GSM 06.60 (ETS 300 726): EFR speech transcoding specifications
- GSM 06.61 (ETS 300 727): Frame loss substitution and muting procedures
- GSM 06.62 (ETS 300 728): Comfort noise aspects for EFR channels
- GSM 06.81 (ETS 300 729): Discontinuous transmission (DTX) processing for EFR
- GSM 06.82 (ETS 300 730): Voice Activity Detector (VAD) for EFR
- GSM 06.53 (ETS 300 724): Reference C code for EFR codec
- GSM 06.54 (ETS 300 725): Test vectors for EFR codec validation
Keywords: GSM standard, EFR speech codec, Enhanced Full Rate, speech processing, digital cellular telecommunications, comfort noise, VAD, DTX, frame substitution, codec interoperability, GSM voice quality, ETSI, SIST standards.
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Frequently Asked Questions
SIST ETS 300 723 E2:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system; Enhanced Full Rate (EFR) speech processing functions; General description (GSM 06.51 version 5.2.1)". This standard covers: CRs from SMG#32
CRs from SMG#32
SIST ETS 300 723 E2:2003 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 ETS 300 723 E2:2003 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 ETS 300 723 E2:2003 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)
SLOVENSKI STANDARD
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP±)XQNFLMH]DREGHODYRL]EROMãDQHJD
JRYRUDVSROQRKLWURVWMR ()5 ±6SORãQLRSLV *60UD]OLþLFD
Digital cellular telecommunications system; Enhanced Full Rate (EFR) speech
processing functions; General description (GSM 06.51 version 5.2.1)
Ta slovenski standard je istoveten z: ETS 300 723 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 723
TELECOMMUNICATION December 2000
STANDARD Second Edition
Source: ETSI TC-SMG Reference: RE/SMG-110651
ICS: 33.020
Key words: EFR, digital cellular telecommunications system, Global System for Mobile communications
(GSM), speech
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech processing functions;
General description
(GSM 06.51 version 5.2.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: secretariat@etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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.
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
Whilst every care has been taken in the preparation and publication of the present document, errors in
content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please
write to "ETSI Standards Making Support Dept." at the address shown on the title page.
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
Contents
Intellectual Property Rights.5
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 General.8
5 Enhanced Full Rate speech channel transcoding.10
6 Enhanced Full Rate speech channel discontinuous transmission (DTX) .10
7 Enhanced Full Rate speech channel Voice Activity Detection (VAD).11
8 Enhanced Full Rate speech channel comfort noise insertion .11
9 Enhanced Full Rate speech channel lost speech frame substitution and muting.11
10 Enhanced Full Rate codec homing .12
11 Alternative Enhanced Full Rate implementation using the Adaptive Multi Rate 12.2 kbit/s mode .12
Annex A (informative): Change Request History .13
History.14
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
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 Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
The present document introduces the Enhanced Full Rate (EFR) speech traffic channels within the digital
cellular telecommunications system.
The present document corresponds to GSM technical specification, GSM 06.51, version 5.1.2.
Transposition dates
Date of adoption of this ETS: 1 December 2000
Date of latest announcement of this ETS (doa):
31 March 2001
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 2001
Date of withdrawal of any conflicting National Standard (dow): 30 September 2001
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
1 Scope
This European Telecommunication Standard (ETS) is an introduction to GSM 06.60 (ETS 300 726) [6],
GSM 06.61 (ETS 300 727) [7], GSM 06.62 (ETS 300 728) [8], GSM 06.81 (ETS 300 729) [9] and
GSM 06.82 (ETS 300 730) [10] ETSs 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 ETSs where each function is specified in detail.
2 Normative references
The present document incorporates by dated and undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to the present document only when incorporated in it by amendment or revision. For undated
references, the latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "Digital cellular telecommunications system (Phase 2);
Abbreviations and acronyms".
[2] GSM 03.50 (ETS 300 540): "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 (ETS 300 575): "Digital cellular telecommunications system
(Phase 2); Channel coding".
[4] GSM 06.53 (ETS 300 724): "Digital cellular telecommunications system;
ANSI-C code for the GSM Enhanced Full Rate (EFR) speech codec".
[5] GSM 06.54 (ETS 300 725): "Digital cellular telecommunications system; Test
vectors for the GSM Enhanced Full Rate (EFR) speech codec".
[6] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech transcoding".
[7] GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;
Substitution and muting of lost frame for Enhanced Full Rate (EFR) speech
traffic channels".
[8] GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;
Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".
[9] GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;
Discontinuous transmission (DTX) for Enhanced Full Rate (EFR) speech traffic
channels".
[10] GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; Voice
Activity Detector (VAD) for Enhanced Full Rate (EFR) speech traffic channels".
3 Definitions and abbreviations
3.1 Definitions
Definition of terms used in the present document can be found in GSM 06.60 (ETS 300 726) [6],
GSM 06.61 (ETS 300 727) [7], GSM 06.62 (ETS 300 728) [8], GSM 06.81 (ETS 300 729) [9] and
GSM 06.82 (ETS 300 730) [10].
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ETS 300 723: December 2000 (GSM 06.51 version 5.2.1)
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 (ETR 100) [1].
4 General
Figure 1 presents a reference configuration where the various speech processing functions are identified.
In this figure, the relevant ETSs 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
(ETS 300 540) [2]. These aspects are only considered to the extent that the performance of the audio
parts affect the performance of the speech transcoder.
An alternative and fully interoperable implementation using as a basis the 12.2 kbit/s mode of the
Adaptive Multi Rate speech coder is described in clause 11.
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