ETSI EN 300 968 V7.0.1 (2000-01)

SLOVENSKI STANDARD
SIST EN 300 968 V7.0.1:2003
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Test
sequences for the GSM half rate speech codec (GSM 06.07 version 7.0.1 Release 1998)
Ta slovenski standard je istoveten z: EN 300 968 Version 7.0.1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST EN 300 968 V7.0.1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 968 V7.0.1:2003

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SIST EN 300 968 V7.0.1:2003
ETSI EN 300 968 V7.0.1 (2000-01)
European Standard (Telecommunications series)
Digital cellular telecommunications system (Phase 2+);
Half rate speech;
Test sequences for the GSM half rate speech codec
(GSM 06.07 version 7.0.1 Release 1998)
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GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
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SIST EN 300 968 V7.0.1:2003
(GSM 06.07 version 7.0.1 Release 1998) 2 ETSI EN 300 968 V7.0.1 (2000-01)
Reference
REN/SMG-110607Q7
Keywords
Digital cellular telecommunications system,
Global System for Mobile communications (GSM)
ETSI
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If you find errors in the present document, send your
comment to: editor@etsi.fr
Important notice
This ETSI deliverable may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network
drive within ETSI Secretariat.
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2000.
All rights reserved.
ETSI

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SIST EN 300 968 V7.0.1:2003
(GSM 06.07 version 7.0.1 Release 1998) 3 ETSI EN 300 968 V7.0.1 (2000-01)
Contents
Intellectual Property Rights.4
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.9
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.11
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- andµ-law PCM Test Sequences.14
10 Test sequences for the GSM half rate speech codec.15
Annex A (informative): Change Request History .16
History .17
ETSI

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SIST EN 300 968 V7.0.1:2003
(GSM 06.07 version 7.0.1 Release 1998) 4 ETSI EN 300 968 V7.0.1 (2000-01)
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 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://www.etsi.org/ipr).
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 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 the Special Mobile Group (SMG).
An electronic attachment accompanies the present document, containing test sequences for a bit exact implementation of
the half rate speech transcoder.
Archive en_300968v070001p0.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".
ETSI

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SIST EN 300 968 V7.0.1:2003
(GSM 06.07 version 7.0.1 Release 1998) 5 ETSI EN 300 968 V7.0.1 (2000-01)
The contents of the present document is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of
release date and an increase in version number as follows:
Version 7.x.y
where:
7 indicates Release 1998 of GSM Phase 2+.
x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates,
etc.
y the third digit is incremented when editorial only changes have been incorporated in the specification.
National transposition dates
Date of adoption of this EN: 31 December 1999
Date of latest announcement of this EN (doa): 31 March 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 September 2000
Date of withdrawal of any conflicting National Standard (dow): 30 September 2000
ETSI

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SIST EN 300 968 V7.0.1:2003
(GSM 06.07 version 7.0.1 Release 1998) 6 ETSI EN 300 968 V7.0.1 (2000-01)
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.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
• For this Release 1998 document, references to GSM documents are for Release 1998 versions (version 7.x.y).
[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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SIST EN 300 968 V7.0.1:2003
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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 subclause, 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_300968v070001p0.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_300968v070001p0.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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SIST EN 300 968 V7.0.1:2003
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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 variables to their initial value. In the case of a correct installation of the ANSI-C simulation
(GSM 06.06 [7]), all speech decoder output frames shall be identical to the corresponding frame in the *.OUT file. In
the case of a correct hardware implementation undergoing type approval, the first speech decoder output frame is
undefined and need not be identical to first frame in the
...