ETSI TS 126 074 V17.0.1 (2022-05)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Mandatory speech codec speech processing functions; Adaptive Multi-Rate (AMR) speech codec test sequences (3GPP TS 26.074 version 17.0.1 Release 17)

RTS/TSGS-0426074vh01

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 4 - Codec
• Current Stage: 12 - Completion
• Completion Date: 09-May-2022

Standards Content (Sample)

TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
Mandatory speech codec speech processing functions;
Adaptive Multi-Rate (AMR) speech codec test sequences
(3GPP TS 26.074 version 17.0.1 Release 17)


3GPP TS 26.074 version 17.0.1 Release 17 1 ETSI TS 126 074 V17.0.1 (2022-05)

Reference
RTS/TSGS-0426074vH01
Keywords
5G,GSM,LTE,UMTS
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ETSI
3GPP TS 26.074 version 17.0.1 Release 17 2 ETSI TS 126 074 V17.0.1 (2022-05)
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Legal Notice
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ETSI
3GPP TS 26.074 version 17.0.1 Release 17 3 ETSI TS 126 074 V17.0.1 (2022-05)
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 General . 6
5 Test sequence format . 6
5.1 File format . 6
5.2 Codec homing . 6
6 Speech codec test sequences . 7
6.1 Codec configuration . 7
6.2 Speech codec test sequences . 7
6.2.1 Speech encoder test sequences . 7
6.2.2 Speech decoder test sequences . 8
6.2.3 Codec homing sequence . 8
7 Test sequences for source controlled rate operation . 9
7.1 Codec configuration . 9
7.2 Test Sequences . 9
7.2.1 Test sequences for background noise estimation . 9
7.2.2 Test sequences for pitch, tone and complex signal detection . 10
7.2.3 Real speech and tones . 10
7.2.4 Test sequence for signal-to-noise ratio estimation . 10
8 Sequences for finding the 20 ms framing of the adaptive multi-rate speech encoder . 10
8.1 Bit synchronisation . 10
8.2 Frame synchronisation . 11
8.3 Formats and sizes of the synchronisation sequences . 11
9 Trau Testing with 8 Bit A- and µ-law PCM Test Sequences . 12
Annex A (informative): Change history . 13
History . 14

ETSI
3GPP TS 26.074 version 17.0.1 Release 17 4 ETSI TS 126 074 V17.0.1 (2022-05)
Foreword
rd
This Technical Specification (TS) 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
3GPP TS 26.074 version 17.0.1 Release 17 5 ETSI TS 126 074 V17.0.1 (2022-05)
1 Scope
The present document specifies the digital test sequences for the adaptive multi-rate (AMR) speech codec. These
sequences test for a bit exact implementation of the adaptive multi-rate speech transcoder (TS 26.090 [2]), voice activity
detection (TS 26.094 [5]), comfort noise (TS 26.092 [3]), and source controlled rate operation (TS 26.093 [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] 3GPP TS 26.071: "AMR Speech Codec; General Description".
[2] 3GPP TS 26.090: "AMR Speech Codec; Speech Transcoding Functions".
[3] 3GPP TS 26.092: "AMR Speech Codec; Comfort Noise Aspects".
[4] 3GPP TS 26.093: "AMR Speech Codec; Source Controlled Rate Operation".
[5] 3GPP TS 26.094: "AMR Speech Codec; Voice Activity Detector".
[6] 3GPP TS 26.091: "AMR Speech Codec; Error Concealment of Lost Frames".
[7] 3GPP TS 26.073: "AMR Speech Codec; ANSI C-code".
[8] 3GPP TS 46.054: "Test sequences for the GSM Enhanced Full Rate (EFR) speech codec".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TS 26.090 [2], TS 26.091 [6],
TS 26.092 [3], TS 26.093 [4] and TS 26.094 [5] apply.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
[T.B.A]
ETSI
3GPP TS 26.074 version 17.0.1 Release 17 6 ETSI TS 126 074 V17.0.1 (2022-05)
4 General
Digital test sequences are necessary to test for a bit exact implementation of the adaptive multi-rate speech transcoder
(TS 26.090 [2]), voice activity detection (TS 26.094 [5]), comfort noise generation (TS 26.092 [3]), and source
controlled rate operation (TS 26.093 [4]).
The test sequences may also be used to verify installations of the ANSI C code in TS 26.073 [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 source controlled rate
operation.
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 µ-law compressed test sequences on the A-Interface.]
5 Test sequence format
This clause provides information on the format of the digital test sequences for the GSM adaptive multi-rate speech
transcoder (TS 26.090 [2]), voice activity detection (TS 26.094 [5]), comfort noise generation (TS 26.092 [3]), and
source controlled rate operation (TS 26.093 [4]).
5.1 File format
The test sequence files in PC (little-endian) byte order are provided in archive files (ZIP format) which accompany the
present document.
Following decompression, three types of file are provided:
- Files for input to the speech encoder: *.INP
- Files for comparison with the encoder output and for input to the speech decoder: *.COD
- Files for comparison with the decoder output: *.OUT
- One mode control file for the mode switching test T21.MOD
All file formats are described in TS 26.073 [7].
5.2 Codec homing
Each *.INP file includes two homing frames (see TS 26.073 [7]) 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 (TS 26.073 [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.
The function of the two homing frames in the *.COD files is to reset the speech decoder state variables to their initial
value. In the case of a correct installation of the ANSI-C simulation (TS 26.073 [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.
ETSI
3GPP TS 26.074 version 17.0.1 Release 17 7 ETSI TS 126 074 V17.0.1 (2022-05)
6 Speech codec test sequences
This clause describes the test sequences designed to exercise the adaptive multi-rate speech transcoder (TS 26.090 [2]).
6.1 Codec configuration
The speech encoder shall be configured not to operate in the source controlled rate mode.
6.2 Speech codec test sequences
6.2.1 Speech encoder test sequences
Twenty-two encoder input sequences are provided. Note that for the input sequences T00.INP to T03.INP, the
amplitude figures are given in 13-bit precision. The active speech levels are given in dBov.
- T00.INP - Synthetic harmonic signal. The pitch delay varies slowly from 18 to 143.5 samples. The minimum and
maximum amplitudes are -997 and +971.
- T01.INP - Synthetic harmonic signal. The pitch delay varies slowly from 144 down to 18.5 samples. Amplitudes
at saturation point -4096 and +4095.
- T02.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes ± 1250.
- T03.INP - Sinusoidal sweep varying from 150 Hz to 3400 Hz. Amplitudes ± 4000.
- T04.INP - Female speech, active speech level: -19.4 dBov, flat frequency response.
- T05.INP - Male speech, active speech level: -18.7 dBov, flat frequency response.
- T06.INP - Female speech, am
...