ETSI EN 300 395-2 V1.3.3 (2025-02)

TETRA and Critical Communications Evolution (TCCE); Speech codec for full-rate traffic channel; Part 2: TETRA codec

REN/TCCE-00266

TETRA in razvoj kritičnih komunikacij (TCCE) - Govorni kodek za kanal s polno hitrostjo - 2. del: Kodek TETRA

General Information

• Status: Not Published
• Technical Committee: TCCE - TETRA and Critical Communications Evolution
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Due Date: 21-Jan-2025
• Completion Date: 03-Feb-2025
• Ref Project: SIST EN 300 395-2 V1.3.3:2025 - TETRA and Critical Communications Evolution (TCCE) - Speech codec for full-rate traffic channel - Part 2: TETRA codec

Standards Content (Sample)

Draft ETSI EN 300 395-2 V1.3.2 (2024-10)

EUROPEAN STANDARD
TETRA and Critical Communications Evolution (TCCE);
Speech codec for full-rate traffic channel;
Part 2: TETRA codec

2 Draft ETSI EN 300 395-2 V1.3.2 (2024-10)

Reference
REN/TCCE-00266
Keywords
codec, radio, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from the
ETSI Search & Browse Standards application.
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format on ETSI deliver.
Users should be aware that the present document may be revised or have its status changed,
this information is available in the Milestones listing.
If you find errors in the present document, please send your comments to
the relevant service listed under Committee Support Staff.
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure (CVD) program.
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2024.
All rights reserved.
ETSI
3 Draft ETSI EN 300 395-2 V1.3.2 (2024-10)
Contents
Intellectual Property Rights . 7
Foreword . 7
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Full rate codec . 11
4.1 Structure of the codec . 11
4.2 Functional description of the codec . 13
4.2.1 Pre- and post-processing . 13
4.2.2 Encoder . 13
4.2.2.0 General . 13
4.2.2.1 Short-term prediction . 14
4.2.2.2 LP to LSP and LSP to LP conversion . 15
4.2.2.3 Quantization and interpolation of LP parameters . 17
4.2.2.4 Long-term prediction analysis . 18
4.2.2.5 Algebraic codebook: structure and search . 20
4.2.2.6 Quantization of the gains . 23
4.2.2.7 Detailed bit allocation . 24
4.2.3 Decoder . 25
4.2.3.0 General . 25
4.2.3.1 Decoding process . 25
4.2.3.1.0 General . 25
4.2.3.1.1 Decoding of LP filter parameters . 25
4.2.3.1.2 Decoding of the adaptive codebook vector. 26
4.2.3.1.3 Decoding of the innovation vector . 26
4.2.3.1.4 Decoding of the adaptive and innovative codebook gains . 26
4.2.3.1.5 Computation of the reconstructed speech . 26
4.2.3.2 Error concealment . 26
5 Channel coding for speech . 27
5.1 General . 27
5.2 Interfaces in the error control structure . 27
5.3 Notations . 29
5.4 Definition of sensitivity classes and error control codes . 29
5.4.1 Sensitivity classes . 29
5.4.2 CRC codes . 29
5.4.3 16-state RCPC codes . 31
5.4.3.0 General . 31
5.4.3.1 Encoding by the 16-state mother code of rate 1/3 . 31
5.4.3.2 Puncturing of the mother code . 31
5.5 Error control scheme for normal speech traffic channel . 32
5.5.0 General . 32
5.5.1 CRC code . 32
5.5.2 RCPC codes . 32
5.5.2.0 General . 32
5.5.2.1 Puncturing scheme of the RCPC code of rate 8/12 (equal to 2/3) . 33
5.5.2.2 Puncturing scheme of the RCPC code of rate 8/18 . 33
5.5.3 Matrix Interleaving . 33
5.6 Error control scheme for speech traffic channel with frame stealing activated . 34
ETSI
4 Draft ETSI EN 300 395-2 V1.3.2 (2024-10)
5.6.0 General . 34
5.6.1 CRC code . 34
5.6.2 RCPC codes . 35
5.6.2.0 General . 35
5.6.2.1 Puncturing scheme of the RCPC code of rate 8/17 . 36
5.6.3 Interleaving . 36
6 Channel decoding for speech . 36
6.1 General . 36
6.2 Error control structure . 36
7 Codec performance. 37
8 Bit exact description of the TETRA codec. 37
9 AMR speech codec . 39
10 Channel coding for AMR speech . 39
10.1 General . 39
10.2 Interfaces in the error control structure . 39
10.3 Notations . 39
10.4 Definition of sensitivity classes and error control codes . 39
10.4.1 Sensitivity classes . 39
10.4.2 CRC codes . 39
10.4.3 16-state RCPC codes .
...

SLOVENSKI STANDARD
01-april-2025
TETRA in razvoj kritičnih komunikacij (TCCE) - Govorni kodek za kanal s polno
hitrostjo - 2. del: Kodek TETRA
TETRA and Critical Communications Evolution (TCCE) - Speech codec for full-rate traffic
channel - Part 2: TETRA codec
Ta slovenski standard je istoveten z: ETSI EN 300 395-2 V1.3.3 (2025-02)
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
TETRA and Critical Communications Evolution (TCCE);
Speech codec for full-rate traffic channel;
Part 2: TETRA codec

2 ETSI EN 300 395-2 V1.3.3 (2025-02)

Reference
REN/TCCE-00266
Keywords
codec, radio, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from the
ETSI Search & Browse Standards application.
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format on ETSI deliver repository.
Users should be aware that the present document may be revised or have its status changed,
this information is available in the Milestones listing.
If you find errors in the present document, please send your comments to
the relevant service listed under Committee Support Staff.
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure (CVD) program.
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2025.
All rights reserved.
ETSI
3 ETSI EN 300 395-2 V1.3.3 (2025-02)
Contents
Intellectual Property Rights . 7
Foreword . 7
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Full rate codec . 11
4.1 Structure of the codec . 11
4.2 Functional description of the codec . 13
4.2.1 Pre- and post-processing . 13
4.2.2 Encoder . 13
4.2.2.0 General . 13
4.2.2.1 Short-term prediction . 14
4.2.2.2 LP to LSP and LSP to LP conversion . 15
4.2.2.3 Quantization and interpolation of LP parameters . 17
4.2.2.4 Long-term prediction analysis . 18
4.2.2.5 Algebraic codebook: structure and search . 20
4.2.2.6 Quantization of the gains . 23
4.2.2.7 Detailed bit allocation . 24
4.2.3 Decoder . 25
4.2.3.0 General . 25
4.2.3.1 Decoding process . 25
4.2.3.1.0 General . 25
4.2.3.1.1 Decoding of LP filter parameters . 25
4.2.3.1.2 Decoding of the adaptive codebook vector. 26
4.2.3.1.3 Decoding of the innovation vector . 26
4.2.3.1.4 Decoding of the adaptive and innovative codebook gains . 26
4.2.3.1.5 Computation of the reconstructed speech . 26
4.2.3.2 Error concealment . 26
5 Channel coding for speech . 27
5.1 General . 27
5.2 Interfaces in the error control structure . 27
5.3 Notations . 29
5.4 Definition of sensitivity classes and error control codes . 29
5.4.1 Sensitivity classes . 29
5.4.2 CRC codes . 29
5.4.3 16-state RCPC codes . 31
5.4.3.0 General . 31
5.4.3.1 Encoding by the 16-state mother code of rate 1/3 . 31
5.4.3.2 Puncturing of the mother code . 31
5.5 Error control scheme for normal speech traffic channel . 32
5.5.0 General . 32
5.5.1 CRC code . 32
5.5.2 RCPC codes . 32
5.5.2.0 General . 32
5.5.2.1 Puncturing scheme of the RCPC code of rate 8/12 (equal to 2/3) . 33
5.5.2.2 Puncturing scheme of the RCPC code of rate 8/18 . 33
5.5.3 Matrix Interleaving . 33
5.6 Error control scheme for speech traffic channel with frame stealing activated . 34
ETSI
4 ETSI EN 300 395-2 V1.3.3 (2025-02)
5.6.0 General . 34
5.6.1 CRC code . 34
5.6.2 RCPC codes . 35
5.6.2.0 General . 35
5.6.2.1 Puncturing scheme of the RCPC code of rate 8/17 . 36
5.6.3 Interleaving . 36
6 Channel decoding for speech . 36
6.1 General . 36
6.2 Error control structure . 36
7 Codec performance. 37
8 Bit exact description of the TETRA codec. 37
9 AMR speech codec . 39
10 Channel coding for AMR speech . 39
10.1 General . 39
10.2 Interfaces in the error control
...