SIST EN 300 395-1 V1.2.1:2006

• Abstract:

  The present document is an introduction to the other parts of this multi-part deliverable dealing with the speech processing functions in the TETRA system. In addition to this introduction, the present document contains the full specification of the speech CODEC including provisions for specific cases of operation and optional functionalities plus CODEC conformance testing. The present document also contains the full specification for the optional AMR CODEC as implemented within the TETRA system. In the present document, a general overview of the speech processing parts is given with reference to the multi-part deliverable where each part is specified in detail.

• Status: Published
• Publication Date: 31-Mar-2006
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2006
• Due Date: 01-Apr-2006
• Completion Date: 01-Apr-2006
• Ref Project: ETSI EN 300 395-1 V1.2.1 (2005-01) - Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 1: General description of speech functions

Overview

SIST EN 300 395-1 V1.2.1:2006 specifies the general description of speech processing functions, including the speech codec used on the full-rate traffic channel in the Terrestrial Trunked Radio (TETRA) system. This standard serves as the introduction to a comprehensive, multi-part series defining how speech is encoded, transmitted, and decoded in TETRA digital radio networks. The document provides the detailed specification of the TETRA speech codec, provisions for specific cases of operation, optional functionalities such as the Advanced Multi-Rate (AMR) codec implementation, and outlines procedures for codec conformance testing.

TETRA is a critical international standard for digital mobile radio communications, widely used in public safety, transportation, utilities, and enterprise networks. Ensuring reliable and high-quality speech transmission is central to TETRA's function, making the definition and testing of the speech codec fundamental for equipment interoperability and system performance.

Key Topics

• Speech Codec Specification
  The standard fully defines the TETRA full-rate speech codec, based on Code-Excited Linear Predictive (CELP) technology, with specific reference to an Algebraic CELP (ACELP) scheme for optimal speech quality and bandwidth efficiency.

• Speech Processing Functions
  Includes descriptions of key speech processing features such as:

  • Speech encoding and decoding between Mobile Station (MS) and Base Station (BS)
  • Handling of lost frames (Missing Frame Generation/Substitution)
  • Comfort noise generation for enhanced listening experience amid frame loss
  • Importance parameter calculation for robust communication control
  • Homing functions to ensure bit-exact implementation and reliable state resets

• AMR Codec (Optional)
  The standard allows for the use of the Advanced Multi-Rate (AMR) codec, specifically supporting the 4.75 kbit/s mode, as an optional feature for increased flexibility in speech quality and bandwidth use.

• Conformance Testing
  Outlines the requirements and procedures for codec conformance testing, ensuring that TETRA equipment meets consistent levels of speech quality, interoperability, and reliability.

Applications

TETRA speech codecs and their defined operation are essential in:

• Public Safety Communications:
  Mission-critical voice communication for emergency services such as police, fire, and ambulance, where reliability and clarity are paramount.

• Transport and Utilities:
  Secure and efficient communications for railway operations, airport ground services, and electrical grid management.

• Industrial and Enterprise Networks:
  Group communication, dispatch operations, and secure voice links in large manufacturing facilities and corporate campuses.

• Interoperability Validation:
  Equipment vendors and system integrators use the codec specifications and conformance tests to certify devices for interoperability and compliance with international TETRA standards.

Related Standards

For comprehensive understanding and implementation, the following standards are closely related to SIST EN 300 395-1 V1.2.1:2006:

• EN 300 395-2: TETRA speech codec detailed specification
• EN 300 395-3: Specific operating features for speech codecs in TETRA
• EN 300 395-4: Procedures and sequences for codec conformance testing
• EN 300 392-2: TETRA Voice plus Data (V+D) Air Interface definition
• EN 300 392-7: TETRA Security (relevant for speech/data encryption)

Summary

SIST EN 300 395-1 V1.2.1:2006 is a foundational document in the TETRA standard family, defining the general structure and operation of speech functions and codecs for full-rate traffic channels. Its specifications ensure high-quality, secure, and reliable speech communications essential for professional mobile radio users across critical sectors. By adhering to this standard, organizations can achieve robust TETRA system deployments with guaranteed interoperability and communication efficiency.

SLOVENSKI STANDARD
01-april-2006
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: EN 300 395-1 Version 1.2.1
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 Standard (Telecommunications series)

Terrestrial Trunked Radio (TETRA);
Speech codec for full-rate traffic channel;
Part 1: General description of speech functions

2 ETSI EN 300 395-1 V1.2.1 (2005-01)

Reference
REN/TETRA-05113-1
Keywords
TETRA, codec
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ETSI
3 ETSI EN 300 395-1 V1.2.1 (2005-01)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.5
3.1 Definitions.5
3.2 Abbreviations.5
4 General.6
5 Full rate speech CODEC .6
6 Speech control unit.8
6.1 Lost frame aspects.8
6.2 Comfort noise aspects .8
6.3 Importance parameter.8
6.4 Homing function.8
7 Conformance testing.8
8 AMR speech codec.9
Annex A (informative): Bibliography.10
History .11

ETSI
4 ETSI EN 300 395-1 V1.2.1 (2005-01)
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://webapp.etsi.org/IPR/home.asp).
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 Standard (Telecommunications series) has been produced by ETSI Project Terrestrial Trunked Radio
(TETRA).
The present document is part 1 of a multi-part deliverable covering speech codec for full-rate traffic channel, as
identified below:
Part 1: "General description of speech functions";
Part 2: "TETRA codec";
Part 3: "Specific operating features";
Part 4: "Codec conformance testing".

National transposition dates
Date of adoption of this EN: 21 January 2005
Date of latest announcement of this EN (doa): 30 April 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 October 2005
Date of withdrawal of any conflicting National Standard (dow): 31 October 2005

ETSI
5 ETSI EN 300 395-1 V1.2.1 (2005-01)
1 Scope
The present document is an introduction to the other parts of this multi-part deliverable dealing with the speech
processing functions in the TETRA system. In addition to this introduction, the present document contains the full
specification of the speech CODEC including provisions for specific cases of operation and optional functionalities plus
CODEC conformance testing. The present document also contains the full specification for the optional AMR CODEC
as implemented within the TETRA system. In the present document, a general overview of the speech processing parts
is given with reference to the multi-part deliverable where each part is specified in detail.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ETSI TS 126 090: "Universal Mobile Telecommunications System (UMTS); Mandatory Speech
Codec speech processing functions AMR Speech Codec - Transcoding functions
(3GPP TS 26.090 Release 4)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in EN 300 392-2, clause 3 apply.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in EN 300 392-2, clause 3 and the following apply:
ACELP Algebraic CELP
AMR Advanced Multi-Rate
BS Base Station
CELP Code-Excited Linear Predictive
MFG Missing Frame Generation
MFS Missing Frame Substitution
MS Mobile Station
PCM Pulse Code Modulated
SCR Source Controlled Rate
ETSI
6 ETSI EN 300 395-1 V1.2.1 (2005-01)
4 General
Figure 1 illustrates a refe
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