SIST ETS 300 395-1:1999

• Abstract:

  Selection and specification of the speech codec for TETRA voice plus data standard

• Status: Published
• Publication Date: 31-Oct-1999
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1999
• Due Date: 01-Nov-1999
• Completion Date: 01-Nov-1999
• Mandate: T-300
• Ref Project: ETSI ETS 300 395-1 ed.1 (1997-05) - Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 1: General description of speech functions

Overview

SIST ETS 300 395-1:1999 defines the general description of speech functions for the Terrestrial Trunked Radio (TETRA) system, focusing on the full-rate speech codec used in voice plus data (V+D) environments. Developed by SIST and based on ETSI standards, this document provides an introduction to the architecture, interfaces, and essential speech processing aspects that enable reliable voice communication in digital trunked radio systems. The standard is directly aligned with ETS 300 395-1 and serves as Part 1 of a four-part series on TETRA speech codecs, supporting both interoperability and performance in critical communications.

Key Topics

• TETRA Speech Codec Architecture: Outlines the configuration and core building blocks of speech processing within TETRA systems, including encoder, decoder, and control units.
• Full-Rate Traffic Channel Functions: Details the handling of speech coding and decoding for full-rate channels ensuring consistent voice quality across TETRA networks.
• Input and Output Specifications: Standardizes the speech codec’s interface as 16-bit linear Pulse Code Modulated (PCM), sampled at 8000 Hz.
• Frame Management: Explains frame stealing for control signaling, lost frame handling, and error concealment to maintain audio quality under various conditions.
• Comfort Noise Generation: Describes methods for generating comfort noise to ensure natural listening during periods of silence or dropped packets.
• Speech Importance Parameter: Introduces the computation of an importance parameter for every speech frame, supporting advanced operational control such as discontinuous transmission and improved direction control in half-duplex modes.
• Codec Homing Function: Specifies procedures to reset codec state variables, which is essential for bit-accurate test reproducibility and error recovery.
• Conformance Testing Framework: Provides references for testing codec functionality and verifying interoperability according to the TETRA standards family.

Applications

The standardized TETRA speech codec plays a vital role in mission-critical communications, including:

• Public Safety and Emergency Services: Enables reliable digital voice transmission for police, fire, and ambulance services using TETRA radio networks.
• Transport and Utilities: Supports secure, robust communication for railways, airports, public transit, and utility companies with requirements for high voice clarity and data integration.
• Industrial and Enterprise Radio Networks: Facilitates group calling, dispatch, and workflow management in sectors needing dependable, real-time team communication.
• Interoperable Multi-Vendor Deployments: Ensures consistent voice quality and data services across equipment from different manufacturers, leveraging the standardized speech codec design.

Related Standards

The following standards form the extended TETRA codec specification and are referenced within SIST ETS 300 395-1:1999:

• ETS 300 395-2: Defines the detailed TETRA codec algorithms, including the mapping between raw PCM signals and encoded speech frames.
• ETS 300 395-3: Describes specific operating features such as frame handling techniques, comfort noise generation, and additional codec functionalities.
• ETS 300 395-4: Outlines conformance testing procedures and provides digital test sequences for verifying codec implementation.
• ETS 300 392-2: Specifies general TETRA system definitions, terminology, and the air interface for voice and data integration.
• ETS 300 392-7: Details TETRA security mechanisms, especially relevant for protecting speech and data streams.

By adhering to SIST ETS 300 395-1:1999 and its related standards, organizations ensure high-quality, interoperable, and secure digital voice services in their TETRA radio networks. This standard is crucial for manufacturers, system integrators, and end-users seeking compliance and best practice implementation in digital trunked radio communications.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prizemni snopovni radio (TETRA) - Govorni kodek za prometni kanal s polno hitrostjo - 1. del: Splošni opis govornih funkcijTerrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 1: General description of speech functions33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)33.020Telekomunikacije na splošnoTelecommunications in generalICS:Ta slovenski standard je istoveten z:ETS 300 395-1 Edition 13SIST ETS 300 395-1:1999en01-MXOLM-19993SIST ETS 300 395-1:1999SLOVENSKI
STANDARD
EUROPEANETS 300 395-1TELECOMMUNICATIONMay 1997STANDARDSource: ETSI TC-RESReference: DE/RES-06002-1ICS:33.020Key words:TETRA, CODECTerrestrial Trunked Radio (TETRA);Speech CODEC for full-rate traffic channel;Part 1: General description of speech functionsETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 395-1:1999

Page 2ETS 300 395-1: May 1997Whilst 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.SIST ETS 300 395-1:1999

Page 3ETS 300 395-1: May 1997ContentsForeword.51Scope.72Normative references.73Definitions, and abbreviations.73.1Definitions.73.2Abbreviations.74General.85Full rate speech CODEC.86Speech control unit.96.1Lost frame aspects.96.2Comfort noise aspects.106.3Importance parameter.106.4Homing function.107Conformance testing.10History.11SIST ETS 300 395-1:1999

Page 4ETS 300 395-1: May 1997Blank pageSIST ETS 300 395-1:1999

Page 5ETS 300 395-1: May 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Radio Equipment andSystems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).The sole purpose of the copyright statement below is to protect the documentation of the standard itselfand not the technology which is described therein.ETSI states that the technology described herein is in the sole ownership of THOMSON-CSF (subject tothe right of it's associated partner) and the disclosure of the standard documentation cannot be construedas granting any right whatsoever by licence or otherwise on the said technology.THOMSON-CSF has undertaken to grant licences for the technology described in the standard, on fair,reasonable and non-discriminatory terms and conditions to the users of the present standard inaccordance with the ETSI IPR Policy. Such licences are subject to a licence agreement to be agreed uponand entered into with THOMSON-CSF.This ETS consists of four parts as follows:Part 1:"General description of speech functions";Part 2:"TETRA CODEC";Part 3:"Specific operating features";Part 4:"Codec conformance testing".Transposition datesDate of adoption:2 May 1997Date of latest announcement of this ETS (doa):31 August 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):28 February 1998Date of withdrawal of any conflicting National Standard (dow):28 February 1998SIST ETS 300 395-1:1999

Page 6ETS 300 395-1: May 1997Blank pageSIST ETS 300 395-1:1999

Page 7ETS 300 395-1: May 19971ScopeThis European Telecommunication Standard (ETS) is an introduction to the other parts of this ETSdealing with the speech processing functions in the TETRA system. In addition to this introduction, thisETS contains the full specification of the speech CODEC including provisions for specific cases ofoperation and optional functionalities plus CODEC conformance testing. In this part, a general overview ofthe speech processing parts is given with reference to the ETSs where each part is specified in detail.2Normative referencesThis ETS incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to, or revisions of, any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ETS 300 395-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 2:TETRA codec".[2]ETS 300 395-3 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 3:Specific operating features".[3]ETS 300 395-4 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4:Codec conformance testing".[4]ETS 300 392-2 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface".[5]ETS 300 392-7 (1995): "Radio Equipment and Systems (RES); Trans-EuropeanTrunked Radio (TETRA); Voice plus Data; Part 7: Security".3Definitions, and abbreviations3.1DefinitionsRefer to ETS 300 392-2 [4], clause 3 for common TETRA definitions.3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:ACELPAlgebraic CELPBSBase StationCELPCode-Excited Linear PredictiveMFGMissing Frame GenerationMFSMissing Frame SubstitutionMSMobile StationPCMPulse Code ModulatedRefer to ETS 300 392-2 [4], clause 3 for common TETRA abbreviations.SIST ETS 300 395-1:1999

Page 8ETS 300 395-1: May 19974GeneralFigure 1 illustrates a reference configuration with the various speech proce
...

SLOVENSKI STANDARD
01-november-1999
Prizemni snopovni radio (TETRA) - Govorni kodek za prometni kanal s polno
hitrostjo - 1. del: Splošni opis govornih funkcij
Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 1:
General description of speech functions
Ta slovenski standard je istoveten z: ETS 300 395-1 Edition 1
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 395-1
TELECOMMUNICATION May 1997
STANDARD
Source: ETSI TC-RES Reference: DE/RES-06002-1
ICS: 33.020
Key words: TETRA, CODEC
Terrestrial Trunked Radio (TETRA);
Speech CODEC for full-rate traffic channel;
Part 1: General description of speech functions
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: [e-mail]
Tel.: [phone] - Fax: [phone]
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.

Page 2
ETS 300 395-1: 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.

Page 3
ETS 300 395-1: May 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions, and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .7
4 General.8
5 Full rate speech CODEC.8
6 Speech control unit.9
6.1 Lost frame aspects .9
6.2 Comfort noise aspects. 10
6.3 Importance parameter .10
6.4 Homing function.10
7 Conformance testing .10
History.11

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ETS 300 395-1: May 1997
Blank page
Page 5
ETS 300 395-1: May 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
The sole purpose of the copyright statement below is to protect the documentation of the standard itself
and not the technology which is described therein.
ETSI states that the technology described herein is in the sole ownership of THOMSON-CSF (subject to
the right of it's associated partner) and the disclosure of the standard documentation cannot be construed
as granting any right whatsoever by licence or otherwise on the said technology.
THOMSON-CSF has undertaken to grant licences for the technology described in the standard, on fair,
reasonable and non-discriminatory terms and conditions to the users of the present standard in
accordance with the ETSI IPR Policy. Such licences are subject to a licence agreement to be agreed upon
and entered into with THOMSON-CSF.
This ETS consists of four parts as follows:
Part 1: "General description of speech functions";
Part 2: "TETRA CODEC";
Part 3: "Specific operating features";
Part 4: "Codec conformance testing".
Transposition dates
Date of adoption: 2 May 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 300 395-1: May 1997
Blank page
Page 7
ETS 300 395-1: May 1997
1 Scope
This European Telecommunication Standard (ETS) is an introduction to the other parts of this ETS
dealing with the speech processing functions in the TETRA system. In addition to this introduction, this
ETS contains the full specification of the speech CODEC including provisions for specific cases of
operation and optional functionalities plus CODEC conformance testing. In this part, a general overview of
the speech processing parts is given with reference to the ETSs where each part is specified in detail.
2 Normative references
This ETS incorporates, by dated or 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] ETS 300 395-2 (1995): "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 2:
TETRA codec".
[2] ETS 300 395-3 (1995): "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 3:
Specific operating features".
[3] ETS 300 395-4 (1995): "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 4:
Codec conformance testing".
[4] ETS 300 392-2 (1995): "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface".
[5] ETS 300 392-7 (1995): "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA); Voice plus Data; Part 7: Security".
3 Definitions, and abbreviations
3.1 Definitions
Refer to ETS 300 392-2 [4], clause 3 for common TETRA definitions.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ACELP Algebraic CELP
BS Base Station
CELP Code-Excited Linear Predictive
MFG Missing Frame Generation
MFS Missing Frame Substitution
MS Mobile Station
PCM Pulse Code Modulated
Refer to ETS 300 392-2 [4], clause 3 for common TETRA abbreviations.

SIST ETS 300 3
...