SIST ETS 300 725 E1:2003

SLOVENSKI STANDARD
01-december-2003
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Digital cellular telecommunications system (Phase 2+) (GSM); Test sequences for the
GSM Enhanced Full Rate (EFR) speech codec (GSM 06.54 version 5.1.1)
Ta slovenski standard je istoveten z: ETS 300 725 Edition 1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 725
TELECOMMUNICATION February 1998
STANDARD
Source: SMG Reference: DE/SMG-110654Q
ICS: 33.020
Key words: EFR, digital cellular telecommunications system, Global System for Mobile communications
(GSM), speech
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Test sequences for the GSM Enhanced Full Rate (EFR)
speech codec
(GSM 06.54 version 5.1.1)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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 1998. All rights reserved.

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .7
4 General.8
5 Test sequence format .8
5.1 File format.8
5.2 Codec homing.9
6 Speech codec test sequences .9
6.1 Codec configuration.10
6.2 Speech codec test sequences.10
6.2.1 Speech encoder test sequences.10
6.2.2 Speech decoder test sequences.11
6.2.3 Codec homing sequence.11
7 DTX test sequences.13
7.1 Codec configuration.13
7.2 DTX test sequences .13
7.2.1 Predictor values computation.14
7.2.2 Spectral comparison.14
7.2.3 Threshold adaptation.14
7.2.4 Periodicity detection .14
7.2.5 Tone detection.14
7.2.6 Safety and initialisation.14
7.2.7 Comfort noise test sequence .14
7.2.8 Real speech and tones.14
8 Sequences for finding the 20 ms framing of the GSM enhanced full rate speech encoder.15
8.1 Bit synchronisation.15
8.2 Frame synchronisation.16
8.3 Formats and sizes of the synchronisation sequences.16
9 Trau Testing with 8 Bit A- and μ-law PCM Test Sequences .18
History.21
10 Diskettes of test sequences and related files. (attached to back cover)

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee of the European Telecommunications Standards Institute (ETSI).
Eight 3.5 inch diskettes are attached to the back cover of this ETS, the diskettes contain test sequences
for a bit exact implementation of the Enhanced Full Rate (EFR) speech transcoder.
The diskettes contain LHA compressed files and are labelled as follows:
Diskette 1/8 ETS 300 725 clause 10: Test sequences for the GSM Enhanced Full Rate
(EFR) speech codec; Speech test sequences TEST0.xxx to TEST8.xxx.
Diskette 2/8 ETS 300 725 clause 10: Test sequences for the GSM Enhanced Full Rate
(EFR) speech codec; Speech test sequences TEST09.xxx to TEST16.xxx.
Diskette 3/8 ETS 300 725 clause 10: Test sequences for the GSM Enhanced Full Rate
(EFR) speech codec; Speech test sequences TEST17.xxx to TEST20.xxx,
Codec homing and synchronisation sequences.
Diskette 4/8 ETS 300 725 clause 10: Test sequences for the GSM Enhanced Full Rate
(EFR) speech codec; DTX test sequences.
Diskettes 5-8/8 ETS 3000 725 clause 10: Test sequences for the GSM Enhance Full Rate
(EFR) speech codec; 8 bit A- and μ-law compressed test sequences for
alternative TRAU testing.
This ETS specifies the digital test sequences for the GSM enhanced full rate speech codect for the digital
cellular telecommunications system.
Transposition dates
Date of adoption of this ETS: 6 February 1998
Date of latest announcement of this ETS (doa): 31 May 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1998
Date of withdrawal of any conflicting National Standard (dow): 30 November 1998

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
1 Scope
This European Telecommunication Standard (ETS) specifies the digital test sequences for the GSM
enhanced full rate speech codec. These sequences test for a bit exact implementation of the enhanced
full rate speech transcoder (GSM 06.60 (ETS 300 726) [2]), Voice Activity Detection (GSM 06.82
(ETS 300 730) [6]), comfort noise (GSM 06.62 (ETS 300 728) [4]) and the discontinuous transmission
(GSM 06.81 (ETS 300 729) [5]).
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 350): "Digital cellular telecommunication system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 06.60 (ETS 300 726): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech transcoding".
[3] GSM 06.61 (ETS 300 727): "Digital cellular telecommunications system;
Substitution and muting of lost frames for Enhanced Full Rate (EFR) speech
traffic channels".
[4] GSM 06.62 (ETS 300 728): "Digital cellular telecommunications system;
Comfort noise aspects for Enhanced Full Rate (EFR) speech traffic channels".
[5] GSM 06.81 (ETS 300 729): "Digital cellular telecommunications system;
Discontinuous Transmission (DTX) for Enhanced Full Rate (EFR) speech traffic
channels".
[6] GSM 06.82 (ETS 300 730): "Digital cellular telecommunications system; Voice
Activity Detection (VAD) for Enhanced Full Rate (EFR) speech traffic channels".
[7] GSM 06.53 (ETS 300 724): "Digital cellular telecommunications system; ANSI-C
code for the GSM Enhanced Full Rate (EFR) speech codec".
[8] GSM 06.51 (ETS 300 723): "Digital cellular telecommunications system;
Enhanced Full Rate (EFR) speech coding functions; General description".
3 Definitions and abbreviations
3.1 Definitions
Definition of terms used in this ETS can be found in GSM 06.60 (ETS 300 726) [2], GSM 06.61
(ETS 300 727) [3], GSM 06.62 (ETS 300 728) [4], GSM 06.81 (ETS 300 729) [5] and GSM 06.82
(ETS 300 730) [6].
3.2 Abbreviations
For the purposes of this ETS, 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 (ETR 100) [1].

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
4 General
Digital test Voice Activity Detection (GSM 06.82 (ETS 300 730) [6]), comfort noise (GSM 06.62
(ETS 300 728) [4]) and the discontinuous transmission (GSM 06.81 (ETS 300 729) [5]).
The test sequences may also be used to verify installations of the ANSI C code in GSM 06.53
(ETS 300 725) [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 synchronisation is obtained between the test sequences and the
speech codec under test.
Clause 9 describes the alternative acceptance testing of the speech encoder and decoder in the TRAU by
means of 8 bit A- or m-law compressed test sequences on the A-Interface.
Electronic copies of the digital test sequences are provided as clause 109, these digital test sequences
are contained in the 3.5 inch diskettes attached to the back cover of this ETS 300 725.
5 Test sequence format
This clause provides information on the format of the digital test sequences for the GSM enhanced full
rate speech transcoder (GSM 06.60 (ETS 300 726) [2]), Voice Activity Detection (GSM 06.82
(ETS 300 730) [6]), comfort noise (GSM 06.62 (ETS 300 728) [4]) and the discontinuous transmission
(GSM 06.81 (ETS 300 729) [5]).
5.1 File format
The test sequence files are provided on floppy disks (3.5 inch) which are formatted according to the high
1) 2)
capacity (1.44 Mb) specifications for MS-DOS IBM -PC/AT compatible computers.
Following decompression, four types of file are provided:
- Files for input to the GSM enhanced full rate speech encoder: *.INP
- Files for comparison with the encoder output: *.COD
- Files for input to the GSM enhanced full rate speech decoder: *.DEC
- Files for comparison with the decoder output: *.OUT
The *.DEC files are generated from the corresponding *.COD files.
Tables 1, 2, 3 and 4 define the formats of the four types of file.
Each speech parameter within the speech frame of 244 bits/20 ms is contained in a serial string of 16 bit
words, where each word contains the value of one bit of the parameter. In each string of n 16 bit words
containing the n bits of a parameter, the most significant bit of the parameter is written first, and the least
significant bit is written last. The bit value contained in a single 16 bit word is either 0x0000 or 0x0001
(right justified) for the binary values of “0” and “1”, respectively. See Table 6 of GSM 06.60
(ETS 300 726) [2] for the order of occurrence and bit allocation of speech parameters within the speech
frame of 244 bits/20 ms.
The samples in the encoder input signal and in the decoder output signal are left justified.

1)
This is a trademark of Microsoft.
2)
This is a trademark of International Business Machines

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
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 06.53 (ETS 300 725) [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 testing, 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 06.53 (ETS 300 725) [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 testing, the first speech decoder output frame is undefined and need not be
identical to first frame in the *.OUT file, but all remaining speech decoder output frames shall be identical
to the corresponding frames in the *.OUT file.
Table 1: Encoder input sequence (*.INP) format
Name Description No. of bits Justification
s(n) Encoder input signal 13 Left
Table 2: Encoder output sequence (*.COD) format
Name Description No. of bits Justification
Speech parameters
Serial stream of speech parameter
SPEECH bits to the channel encoder 244 Right
Additional information
VAD Voice activity detection flag 1 Right
SP SP flag 1 Right
Table 3: Decoder input sequence (*.DEC) format
Name Description No. of bits Justification
Additional information
BFI Bad Frame Indicator flag 1 Right
Speech parameters
Serial stream of speech parameter
SPEECH bits to the channel encoder 244 Right
Additional information
SID Silence Descriptor flag 1 Right
TAF Time Alignment Flag 1 Right
Table 4: Decoder output sequence (*.OUT) format
Name Description No. of bits Justification
s'(n) Decoder output signal 13 Left
6 Speech codec test sequences
This clause describes the test sequences designed to exercise the GSM enhanced full rate speech
transcoder (GSM 06.60 (ETS 300 726) [2]).

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
6.1 Codec configuration
The speech encoder shall be configured to operate in the non-DTX mode. The VAD and SP flags shall be
set to 1 at the speech encoder output.
6.2 Speech codec test sequences
Table 5 lists the location and size of the speech codec test sequences.
6.2.1 Speech encoder test sequences
Twenty-one encoder input sequences are provided. Note that for the input sequences TEST0.INP to
TEST3.INP, the amplitude figures are given in 13-bit precision. The active speech levels are given in
dBov.
- TEST0.INP - Synthetic harmonic signal. The pitch delay varies slowly from 18 to 143.5 samples.
The minimum and maximum amplitudes are -997 and +971.
- TEST1.INP - Synthetic harmonic signal. The pitch delay varies slowly from 144 down to 18.5
samples. Amplitudes at saturation point -4096 and +4095.
- TEST2.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes – 1250.
- TEST3.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes – 4000.
- TEST4.INP - Female speech, active speech level: -19.4 dBov, flat frequency response.
- TEST5.INP - Male speech, active speech level: -18.7 dBov, flat frequency response.
- TEST6.INP - Female speech, ambient noise, active speech level: -35.0 dBov, flat frequency
response.
- TEST7.INP - Female speech, ambient noise, active speech level: -25.0 dBov, flat frequency
response.
- TEST8.INP - Female speech, ambient noise, active speech level: -15.6 dBov, flat frequency
response.
- TEST9.INP - Female speech, car noise, active speech level: -35.5 dBov, flat frequency response.
- TEST10.INP - Female speech, car noise, active speech level: -26.1 dBov, flat frequency response.
- TEST11.INP - Female speech, car noise, active speech level: -15.8 dBov, flat frequency response.
- TEST12.INP - Male speech, ambient noise, active speech level: -34.9 dBov, flat frequency
response.
- TEST13.INP - Male speech, ambient noise, active speech level: -24.8 dBov, flat frequency
response.
- TEST14.INP - Male speech, ambient noise, active speech level: -15.0 dBov, flat frequency
response.
- TEST15.INP - Male speech, babble noise, active speech level: -34.1 dBov, flat frequency response.
- TEST16.INP - Male speech, babble noise, active speech level: -24.3 dBov, flat frequency response.
- TEST17.INP - Male speech, babble noise, active speech level: -14.4 dBov, flat frequency response.

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ETS 300 725 (GSM 06.54 version 5.1.1): February 1998
- TEST18.INP - Female speech, ambient noise, active speech level: -26.0 dBov, modified IRS
frequency response, with many zero frames.
- TEST19.INP - Male speech, ambient noise, active speech level: -36.0 dBov, modified IRS
frequency response, with many zero frames.
- TEST20.INP - Sequence for exercising the LPC vector quantisation codeboo
...