SIST ETS 300 723 E2:2003

SLOVENSKI STANDARD
SIST ETS 300 723 E2:2003
01-december-2003
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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)
SIST ETS 300 723 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 723 E2:2003

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SIST ETS 300 723 E2:2003


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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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)
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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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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