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TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Codec for Enhanced Voice Services (EVS);
ANSI C code (fixed-point)
(3GPP TS 26.442 version 12.1.0 Release 12)
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3GPP TS 26.442 version 12.1.0 Release 12 1 ETSI TS 126 442 V12.1.0 (2015-01)
Reference
RTS/TSGS-0426442vc10
Keywords
LTE,UMTS
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© European Telecommunications Standards Institute 2015.
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TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
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3GPP TS 26.442 version 12.1.0 Release 12 2 ETSI TS 126 442 V12.1.0 (2015-01)
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://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.
Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "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
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3GPP TS 26.442 version 12.1.0 Release 12 3 ETSI TS 126 442 V12.1.0 (2015-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 C code structure . 6
4.1 Contents of the C source code . 6
4.2 Program execution . 7
5 File formats . 7
5.1 Speech file (encoder input / decoder output) . 7
5.2 Rate switching profile (encoder input) . 8
5.3 Parameter bitstream file (encoder output / decoder input) . 8
5.3.1 ITU-T G.192 compliant format . 8
5.4 VoIP parameter bitstream file (decoder input) . 8
Annex A (informative): Change history . 9
History . 10
ETSI
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3GPP TS 26.442 version 12.1.0 Release 12 4 ETSI TS 126 442 V12.1.0 (2015-01)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
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
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3GPP TS 26.442 version 12.1.0 Release 12 5 ETSI TS 126 442 V12.1.0 (2015-01)
1 Scope
The present document contains an electronic copy of the ANSI-C code for the Enhanced Voice Services (EVS) Codec.
The ANSI-C code is necessary for a bit exact implementation of the EVS Codec (3GPP TS 26.445), Voice Activity
Detection (VAD) (3GPP TS 26.451), Comfort Noise Generation (CNG) (3GPP TS 26.449), Discontinuous
Transmission (DTX) (3GPP TS 26.450), Packet Loss Concealm
...