ETSI ETS 300 966 ed.1 (1997-05)

SLOVENSKI STANDARD
SIST ETS 300 966 E1:2003
01-december-2003
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Digital cellular telecommunications system; Half rate speech; Half rate speech
processing functions (GSM 06.02 version 5.0.1)
Ta slovenski standard je istoveten z: ETS 300 966 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 966 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 966 E1:2003

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SIST ETS 300 966 E1:2003
EUROPEAN ETS 300 966
TELECOMMUNICATION May 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-110602Q
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system;
Half rate speech;
Half rate speech processing functions
(GSM 06.02 version 5.0.1)
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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
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 1997. All rights reserved.

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ETS 300 966 (GSM 06.02 version 5.0.1): May 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 966 (GSM 06.02 version 5.0.1): May 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 General.9
5 Half rate speech transcoding .10
6 Half rate Discontinuous Transmission (DTX).10
7 Half rate Voice Activity Detection (VAD) .11
8 Half rate comfort noise insertion .11
9 Half rate lost speech frame substitution and muting .11
10 Half rate codec homing .12
History.13

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ETS 300 966 (GSM 06.02 version 5.0.1): May 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS gives a general overview of the half rate speech traffic channels speech processing functions for
the digital cellular telecommunications system. This ETS is part of ETSs' series covering the half rate
speech traffic channels as described below:
GSM 06.02 ETS 300 966: "Digital cellular telecommunications system; Half rate
speech; Half rate speech processing functions".
GSM 06.20 ETS 300 969: "Digital cellular telecommunications system; Half rate speech;
Half rate speech transcoding".
GSM 06.21 ETS 300 970: "Digital cellular telecommunications system; Half rate speech;
Substitution and muting of lost frames for half rate speech traffic channels".
GSM 06.22 ETS 300 971: "Digital cellular telecommunications system; Half rate speech;
Comfort noise aspects for half rate speech traffic channels".
GSM 06.41 ETS 300 972: "Digital cellular telecommunications system; Half rate speech;
Discontinuous Transmission (DTX) for half rate speech traffic channels".
GSM 06.42 ETS 300 973: "Digital cellular telecommunications system; Half rate speech;
Voice Activity Detector (VAD) for half rate speech traffic channels".
GSM 06.06 ETS 300 967: "Digital cellular telecommunications system; Half rate speech;
ANSI-C code for the GSM half rate speech codec".
GSM 06.07 ETS 300 968: "Digital cellular telecommunications system; Half rate speech;
Test sequences for the GSM half rate speech codec".
Transposition dates
Date of adoption: 4 April 1997
Date of latest announcement of this ETS (doa): 31 August 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 28 February 1998
Date of withdrawal of any conflicting National Standard (dow): 28 February 1998

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ETS 300 966 (GSM 06.02 version 5.0.1): May 1997
1 Scope
This European Telecommunication Standard (ETS) is an introduction to GSM 06.20 (ETS 300 969) [4],
GSM 06.21 (ETS 300 970) [5], GSM 06.22 (ETS 300 971) [6], GSM 06.41 (ETS 300 972) [7] and
GSM 06.42 (ETS 300 973) [8] ETSs dealing with the speech processing functions in the half-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
This ETS 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 this ETS 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 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 03.50 (ETS 300 903): "Digital cellular telecommunications system
(Phase 2+); Transmission planning aspects of the speech services in the GSM
Public Land Mobile Network (PLMN) system".
[3] GSM 05.03 (ETS 300 909): "Digital cellular telecommunications system
(Phase 2+); Channel coding".
[4] GSM 06.20 (ETS 300 969): "Digital cellular telecommunications system; Half
rate speech: Half rate speech transcoding".
[5] GSM 06.21 (ETS 300 970): " Digital cellular telecommunications system; Half
rate speech; Substitution and muting of lost frame for half rate speech traffic
channels".
[6] GSM 06.22 (ETS 300 971): "Digital cellular telecommunications system; Half
rate speech; Comfort noise aspects for half rate speech traffic channels ".
[7] GSM 06.41 (ETS 300 972): "Digital cellular telecommunications system; Half
rate speech; Discontinuous transmission (DTX) for half rate speech traffic
channels".
[8] GSM 06.42 (ETS 300 973): "Digital cellular telecommunications system; Half
rate speech; Voice Activity Detector (VAD) for half rate speech traffic channels ".
[9] ITU-T Recommendation G.711: "Pulse Code Modulation (PCM) of voice
frequencies".
[10] GSM 06.07 (ETS 300 968): "Digital cellular telecommunications system; Half
rate speech; Test sequences for the GSM half rate speech codec".
[11] GSM 06.06 (ETS 300 967): "Digital cellular telecommunications system; Half
rate speech; ANSI-C code for the GSM half rate speech codec".

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3 Definitions and abbreviations
3.1 Definitions
Definition of terms used in this ETS can be found in GSM 06.20 (ETS 300 969) [4],
GSM 06.21 (ETS 300 970) [5], GSM 06.22 (ETS 300 971) [6], GSM 06.41 (ETS 300 972) [7] and
GSM 06.42 (ETS 300 973) [8].
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BFI Bad Frame Indication
BSS Base Station System
DTX Discontinuous Transmission
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
RX Receive
RSS Radio SubSystem
SACCH Slow Associated Control CHannel
SID SIlence Descriptor
SP flag SPeech flag
TAF Time Alignment Flag
TX Transmit
VSELP Vector Sum Excited Linear Predictor
UFI Unreliable Frame Indication
For abbreviations not given in this subclause, see GSM 01.04 (ETR 100) [1].

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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 fig
...