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

SIST ETS 300 395-1:1999 is the Slovenian adoption of ETS 300 395-1 Edition 1 for Terrestrial Trunked Radio (TETRA) speech coding. It gives the general description of the speech functions for the full-rate traffic channel in TETRA Voice plus Data (V+D), and it points readers to the parts that define the codec, operating features, and conformance testing in detail.

What does SIST ETS 300 395-1:1999 specify?

SIST ETS 300 395-1:1999 specifies the overall speech processing structure for the TETRA full-rate speech CODEC. It is an introductory and architectural part of the TETRA speech codec series, so it explains how the speech path is organized and where the detailed specifications are found.

The document is organized into these clauses:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Definitions, and abbreviations
• Clause 4 - General
• Clause 5 - Full rate speech CODEC
• Clause 6 - Speech control unit
• Clause 7 - Conformance testing

Figure 1 gives the reference configuration of the speech processing functions, including the signals exchanged between them. In practice, this helps implementers see how the speech encoder, decoder, control functions, and interface points fit together in an MS and BS design.

What are the key requirements of SIST ETS 300 395-1:1999?

SIST ETS 300 395-1:1999 defines the speech path and the main control functions that surround the TETRA full-rate codec. The most important points are the interface format, the codec data flow, the handling of lost frames, and the way compliance is checked.

Speech path and interface format

Clause 4 states that the speech input and output at the TETRA speech CODEC use 16-bit linear Pulse Code Modulated (PCM) audio. The standard also shows that the audio path is described for the connection between the Mobile Station (MS) and the Base Station (BS), which matters because implementers must match the digital interface correctly at both ends.

Full-rate codec data flow

Clause 5 describes the full-rate speech CODEC behavior at a high level. In normal operation, the channel coding function produces an encoded block of 432 bits for 60 ms of speech data, and when speech is stolen for signalling purposes it produces 216 bits for 30 ms of speech data.

Clause 5 also states that the full-rate speech source encoder and decoder are defined in ETS 300 395-2, and that the coding model is Code-Excited Linear Predictive (CELP), specifically Algebraic CELP (ACELP). For readers, this means the detailed bit mapping and algorithmic behavior are handled in the companion part, while this part explains the role of the codec in the TETRA speech chain.

Speech control functions

Clause 6 groups the control behavior around the codec and refers the detailed descriptions to ETS 300 395-3. The listed functions are:

• Missing Frame Generation (MFG) and Missing Frame Substitution (MFS) for lost-frame handling
• Comfort noise aspects for long periods of frame loss
• An importance parameter for each speech frame
• A homing function that resets the codec to a known state

In practice, these functions matter when frames are lost, stolen, or used for control purposes, because they help keep speech intelligible and support deterministic testing.

Conformance testing

Clause 7 states that TETRA CODEC conformance testing is described in ETS 300 395-4. The specific operating features from ETS 300 395-3 should be disabled for conformance testing, so test labs evaluate the core codec behavior in a controlled state.

What terms does SIST ETS 300 395-1:1999 define?

SIST ETS 300 395-1:1999 uses a short set of technical abbreviations that are central to the codec description.

• ACELP - Algebraic CELP, the codec technique used for the TETRA speech model.
• CELP - Code-Excited Linear Predictive, the speech coding model underlying the codec.
• MFG - Missing Frame Generation, used to recover speech when a frame is lost.
• MFS - Missing Frame Substitution, used to replace a missing frame with suitable parameters.
• MS - Mobile Station, the user terminal side of the TETRA speech path.
• BS - Base Station, the network-side endpoint in the speech path.
• PCM - Pulse Code Modulated, the 16-bit linear audio format used at the codec interface.

Who uses SIST ETS 300 395-1:1999?

SIST ETS 300 395-1:1999 is used by TETRA equipment engineers, codec developers, and system integrators working on the speech path in Voice plus Data systems. It is also relevant to test laboratories and conformance teams that need to understand the codec architecture before applying the detailed test methods in the companion parts.

Buyers, quality managers, and reviewers use it to check that a proposed TETRA solution covers the correct speech functions, interfaces, and test framework. It is particularly relevant where MS and BS implementations must interoperate with the codec and with encryption-related functions.

What changed in SIST ETS 300 395-1:1999 from the previous edition?

SIST ETS 300 395-1:1999 is identical to ETS 300 395-1 Edition 1.

Which standards are used with SIST ETS 300 395-1:1999?

The document relies on several companion standards in the same TETRA speech series and on core TETRA references:

• ETS 300 395-2 - defines the TETRA codec itself, including the detailed speech encoder and decoder, the bit exact description, and codec performance.
• ETS 300 395-3 - defines specific operating features, including frame stealing, comfort noise, importance, and homing-related behavior.
• ETS 300 395-4 - defines codec conformance testing and the digital test sequences used for verification.
• ETS 300 392-2 - provides common TETRA definitions and abbreviations.
• ETS 300 392-7 - defines the messages at standardized interface points 3, 4, and 8.

What does the SIST ETS 300 395-1:1999 document contain?

SIST ETS 300 395-1:1999 contains a block-level overview of the TETRA speech processing chain, shown in Figure 1, including the speech encoder, channel coding, decoder, control functions, and the interface points between MS and BS. It also identifies where frame stealing, encryption, comfort noise, and homing fit into the speech path.

The document includes the reference configuration and the supporting explanation needed to understand how the speech functions interact. It is written as a guide to the series, so it is most useful when read together with the companion parts that define the codec, the special operating features, and the conformance tests.

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
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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
...