|
TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
ANSI-C code for the GSM Enhanced Full Rate (EFR)
speech codec
(3GPP TS 46.053 version 16.0.0 Release 16)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
---------------------- Page: 1 ----------------------
3GPP TS 46.053 version 16.0.0 Release 16 1 ETSI TS 146 053 V16.0.0 (2020-09)
Reference
RTS/TSGS-0446053vg00
Keywords
GSM
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
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 at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
If you find errors in the present document, please send your comment to one of the following services:
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 2020.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
---------------------- Page: 2 ----------------------
3GPP TS 46.053 version 16.0.0 Release 16 2 ETSI TS 146 053 V16.0.0 (2020-09)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 (https://ipr.etsi.org/).
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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under .
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
---------------------- Page: 3 ----------------------
3GPP TS 46.053 version 16.0.0 Release 16 3 ETSI TS 146 053 V16.0.0 (2020-09)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations . 5
4 C code structure . 6
4.1 Contents of the C source code disk . 6
4.2 Program execution . 6
4.3 Code hierarchy . 7
Annex A (informative): Change History . 13
History . 14
ETSI
---------------------- Page: 4 ----------------------
3GPP TS 46.053 version 16.0.0 Release 16 4 ETSI TS 146 053 V16.0.0 (2020-09)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The present document provides the bit exact definition of the Enhanced Full Rate (EFR) speech traffic codec for the
digital cellular telecommunications system.
An electronic attachment accompanies the present document, containing clause 5, the bit-exact ANSI-C code for the
Enhanced Full Rate speech transcoder.
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
---------------------- Page: 5 ----------------------
3GPP TS 46.053 version 16.0.0 Release 16 5 ETSI TS 146 053 V16.0.0 (2020-09)
1 Scope
The present document contains an electronic copy of the ANSI-C code for the GSM Enhanced Full Rate codec. The
ANSI-C code is necessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (GSM 06.60 [3]),
Voice Activity Detection (GSM 06.82 [7]), comfort noise (GSM 06.62 [5]), Discontinuous Transmission
(GSM 06.81 [6]) and example solutions for substituting and muting of lost frames (GSM 06.61 [4]).
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, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a
GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and
acronyms".
[2] GSM 06.54: "Digital cellular telecommunications system (Phase 2+); Test sequences for the GSM
Enhanced Full Rate (EFR) speech codec".
[3] GSM 06.60: "Digital cellular telecommunications system (Phase 2+); Enhanced Full Rate (EFR)
speech transcoding".
[4] GSM 06.61: "Digital cellular telecommunications system (Phase 2+); Substitution and muting
...