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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Half rate speech;
Test sequences for the GSM half rate speech codec
(3GPP TS 46.007 version 15.0.0 Release 15)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
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3GPP TS 46.007 version 15.0.0 Release 15 1 ETSI TS 146 007 V15.0.0 (2018-07)
Reference
RTS/TSGS-0446007vf00
Keywords
GSM
ETSI
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3GPP TS 46.007 version 15.0.0 Release 15 2 ETSI TS 146 007 V15.0.0 (2018-07)
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.
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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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", "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 46.007 version 15.0.0 Release 15 3 ETSI TS 146 007 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 General . 7
5 Test sequence format . 7
5.1 File format . 7
5.2 Codec homing . 8
6 Speech codec test sequences . 8
6.1 Codec configuration . 8
6.2 Speech codec test sequences . 8
6.2.1 Speech encoder test sequences . 9
6.2.2 Speech decoder test sequences . 9
6.2.3 Codec homing sequence . 9
7 DTX test sequences . 10
7.1 Codec configuration . 10
7.2 DTX test sequences . 10
7.2.1 Predictor values computation . 10
7.2.2 Spectral comparison . 10
7.2.3 Threshold adaptation. 11
7.2.4 Periodicity detection . 11
7.2.5 Tone detection . 11
7.2.6 Safety and initialization . 11
7.2.7 Comfort noise test sequence . 11
7.2.8 Real speech and tones . 11
8 Sequences for finding the 20 ms framing of the GSM half rate speech encoder . 12
8.1 Bit synchronization. 12
8.2 Frame synchronization . 12
8.3 Formats and sizes of the synchronization sequences . 13
9 Trau Testing with 8 Bit A- and µ-law PCM Test Sequences . 13
10 Test sequences for the GSM half rate speech codec . 14
Annex A (informative): Change history . 15
History . 16
ETSI
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3GPP TS 46.007 version 15.0.0 Release 15 4 ETSI TS 146 007 V15.0.0 (2018-07)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
An electronic attachment accompanies the present document, containing test sequences for a bit exact implementation
of the half rate speech transcoder.
Archive en_300968v080001p0.ZIP which accompanies the present document contains compressed files which are
labelled as follows:
Disks24.zip Clause 10: Test sequences for the GSM half rate speech codec; Disks 2 and 4 (GSM 06.07).
Disks135.zip Clause 10: Test sequences for the GSM half rate speech codec; Disks 1, 3 and 5 (GSM 06.07).
Disks6A.zip Clause 10: Test sequences for the GSM half rate speech codec; Disks 6 and 10 (GSM 06.07).
Disks7B.zip Clause 10: Test sequences for the GSM half rate speech codec; Disks 7 and 11 (GSM 06.07).
Disks89.zip Clause 10: Test sequences for the GSM half rate speech codec; Disks 8 and 9 (GSM 06.07).
The present document specifies the half rate speech traffic channels for the Digital cellular telecommunications system.
The present document specifies the digital test sequences for the GSM half rate speech codec for the digital cellular
telecommunications system. The present document, is part of a series covering the half rate speech traffic channels as
described below:
GSM 06.02 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech
processing functions".
GSM 06.06 "Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI-C code for the
GSM half rate speech codec".
GSM 06.07 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Test sequences for
the GSM half rate speech codec".
GSM 06.20 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate speech
transcoding".
GSM 06.21 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and muting
of lost frames for half rate speech traffic channels".
GSM 06.22 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort noise aspects
for half rate speech traffic channels".
GSM 06.41 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Discontinuous
Transmission (DTX) for half rate speech traffic channels".
GSM 06.42 "Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice Activity Detector
(VAD) for half rate speech traffic channels".
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.
ETSI
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3GPP TS 46.007 version 15.0.0 Release 15 5 ETSI TS 146 007 V15.0.0 (2018-07)
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 46.007 version 15.0.0 Release 15 6 ETSI TS 146 007 V15.0.0 (2018-07)
1 Scope
The present document specifies the digital test sequences for the GSM half rate speech codec. These sequences test for
a bit exact implementation of the half rate speech transcoder (GSM 06.20 [2]), Voice Activity Detector
(GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous transmission (GSM 06.41 [5]).
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 06.20: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate
speech transcoding".
[3] GSM 06.21: "Digital cellular telecommunications system (Phase 2+); Half rate speech;
Substitution and muting of lost frame for half rate speech traffic channels".
[4] GSM 06.22: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Comfort
noise aspects for half rate speech traffic channels".
[5] GSM 06.41: "Digital cellular telecommunications system (Phase 2+); Half rate speech;
Discontinuous Transmission (DTX) for half rate speech traffic channels".
[6] GSM 06.42: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Voice
Activity Detector (VAD) for half rate speech traffic channels".
[7] GSM 06.06: "Digital cellular telecommunications system (Phase 2+); Half rate speech; ANSI-C
code for the GSM half rate speech codec".
[8] GSM 06.02: "Digital cellular telecommunications system (Phase 2+); Half rate speech; Half rate
speech coding functions".
3 Definitions and abbreviations
3.1 Definitions
Definition of terms used in the present document can be found in GSM 06.20 [2], GSM 06.21 [3], GSM 06.22 [4],
GSM 06.41 [5] and GSM 06.42 [6].
ETSI
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3GPP TS 46.007 version 15.0.0 Release 15 7 ETSI TS 146 007 V15.0.0 (2018-07)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ETS European Telecommunication Standard
GSM Global System for Mobile communications
For abbreviations not given in this clause, see GSM 01.04 [1].
4 General
Digital test sequences are necessary to test for a bit exact implementation of the half rate speech transcoder
(GSM 06.20 [2]), Voice Activity Detector (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous
transmission (GSM 06.41 [5]).
The test sequences may also be used to verify installations of the ANSI C code in GSM 06.06 [7].
Clause 5 describes the format of the files which contain the digital test sequences. Clause 6 describes the test sequences
for the speech transcoder. Clause 7 describes the test sequences for the VAD, comfort noise and discontinuous
transmission.
Clause 8 describes the method by which synchronization is obtained between the test sequences and the speech codec
under test.
Clause 9 describes the optional acceptance testing of the speech encoder and decoder in the TRAU by means of 8 bit A-
or μ-law compressed test sequences on the A-Interface.
Electronic copies of the digital test sequences are provided as clause 10, these digital test sequences are contained in
archive en_300968v080001p0.ZIP which accompanies the present document.
5 Test sequence format
This clause provides information on the format of the digital test sequences for the GSM half rate speech transcoder
(GSM 06.20 [2]), Voice Activity Detector (GSM 06.42 [6]), comfort noise (GSM 06.22 [4]) and the discontinuous
transmission (GSM 06.41 [5]).
5.1 File format
The test sequence files are provided in archive en_300968v080001p0.ZIP which accompanies the present document.
Following decompression, by execution of the 11 "disk*.exe" files, four types of file are provided:
- Files for input to the GSM half rate speech encoder: *.INP
- Files for comparison with the encoder output: *.COD
- Files for input to the GSM half rate speech decoder: *.DEC
- Files for comparison with the decoder output: *.OUT
Tables 1, 2, 3 and 4 define the formats of the four types of file. Each parameter in these tables is contained in a 16 bit
word except for the samples of the 8 bit PCM test sequences, which are contained in an 8 bit word each. The left or
right justification is indicated in the tables. The size and location of speech parameters in the encoder output (*.COD)
and decoder input files (*.DEC) are described in GSM 06.20 [2].
ETSI
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3GPP TS 46.007 version 15.0.0 Release 15 8 ETSI TS 146 007 V15.0.0 (2018-07)
5.2 Codec homing
Each *.INP file includes two homing frames at the start of the test sequence. The function of these frames is to reset the
speech encoder state variables to their initial value. In the case of a correct installation of the ANSI-C simulation
(GSM 06.06 [7]), all speech encoder output frames shall be identical to the corresponding frame in the *.COD file. In
the case of a correct hardware implementation undergoing type approval, the first speech encoder output frame is
undefined and need not be identical to the first frame in the *.COD file, but all remaining speech encoder output frames
shall be identical to the corresponding frames in the *.COD file.
Each *.DEC file includes two homing frames at the start of the test sequence. The function of these frames is to reset
the speech decoder state v
...