1、 ETSI TS 126 274 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Audio codec processing functions; Extended Adaptive Multi-Rate - Wideband (AMR-WB+) speech codec; Conformance testing (3GPP TS 26.274 version 14.0.0
2、 Release 14) floppy3TECHNICAL SPECIFICATION ETSI ETSI TS 126 274 V14.0.0 (2017-04)13GPP TS 26.274 version 14.0.0 Release 14Reference RTS/TSGS-0426274ve00 Keywords GSM,LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 3
3、48 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The con
4、tent of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Doc
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6、rg/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mech
7、anical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunication
8、s Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM l
9、ogo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 274 V14.0.0 (2017-04)23GPP TS 26.274 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to t
10、hese 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. Late
11、st 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 W
12、eb 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 i
13、dentities 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 http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “s
14、hall 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 dir
15、ect citation. ETSI ETSI TS 126 274 V14.0.0 (2017-04)33GPP TS 26.274 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 Gen
16、eral . 6g35 Conformance 6g35.1 Bit-exactness 7g35.2 Objective quality measures. 8g35.2.1 Encoder . 8g35.2.1.1 AMR-WB mode compliance with DTX disabled . 9g35.2.1.2 AMR-WB mode compliance with DTX enabled 9g35.2.1.3 ACELP mode compliance . 9g35.2.1.4 TCX-256 mode compliance 9g35.2.1.5 TCX-512 mode co
17、mpliance 10g35.2.1.6 TCX-1024 mode compliance 10g35.2.1.7 ACELP/TCX switching compliance . 10g35.2.1.8 ACELP/TCX open-loop mode selection compliance 11g35.2.1.9 Stereo operation compliance . 11g35.2.1.10 Mode switching operation compliance 12g35.2.1.11 Overall mono compliance . 13g35.2.2 Decoder . 1
18、3g35.2.2.1 AMR-WB mode compliance with DTX disabled . 14g35.2.2.2 AMR-WB mode compliance with DTX enabled 14g35.2.2.3 Extension mode compliance in mono operation without frame erasures 14g35.2.2.4 Extension mode compliance in mono operation with frame erasures . 14g35.2.2.5 Extension mode compliance
19、 in stereo operation without frame erasures 15g35.2.2.6 Extension mode compliance in stereo operation with frame erasures . 15g35.2.2.7 Extension mode compliance in stereo to mono downmixing operation without frame erasures 15g35.2.2.8 Extension mode compliance in stereo to mono downmixing operation
20、 with frame erasures 16g35.2.3 Additional objective criteria (valid for both fixed- and floating point versions) 16g35.3 Subjective conformance testing 17g3Annex A (normative): Codec test sequences for bit exact testing of AMR-WB+ . 18g3Annex B (normative): Codec test sequences for objective testing
21、 of AMR-WB+ 19g3Annex C (informative): Change history . 20g3History 21g3ETSI ETSI TS 126 274 V14.0.0 (2017-04)43GPP TS 26.274 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are sub
22、ject 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
23、 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 whe
24、n editorial only changes have been incorporated in the document. ETSI ETSI TS 126 274 V14.0.0 (2017-04)53GPP TS 26.274 version 14.0.0 Release 141 Scope The present document specifies test procedures and digital test sequences to be used for conformance testing of implementations of the Extended Adap
25、tive Multi-Rate Wideband (AMR-WB+) codec. 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-spec
26、ific. 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
27、 as the present document. 1 3GPP TS 26.290: “Audio codec processing functions; Extended Adaptive Multi-Rate - Wideband (AMR-WB+) codec; Transcoding functions“. 2 3GPP TS 26.304: - “Extended Adaptive Multi-Rate - Wideband (AMR-WB+) codec; Floating-point ANSI-C code“. 3 3GPP TS 26.273: “ANSI-C code fo
28、r the fixed-point Extended Adaptive Multi-Rate - Wideband (AMR-WB+) speech codec“. 4 ITU-R Recommendation BS.1387-1: “Method for objective measurements of perceived audio quality“. 5 3GPP TS 26.204: “ANSI-C code for the floating-point Adaptive Multi-Rate - Wideband (AMR-W) speech codec“. 6 3GPP TS 2
29、6.174: “AMR speech codec, wideband; Test sequences“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TS 26.290 1, 3GPP TS 26.304 2 and 3GPP TS 26.273 3 apply. 3.2 Abbreviations For the purposes of the present document,
30、 the following abbreviations apply: ACELP Algebraic Code Excited Linear Prediction AMR Adaptive Multi-Rate AMR-WB Adaptive Multi-Rate Wideband AMR-WB+ Extended Adaptive Multi-Rate Wideband CELP Code Excited Linear Prediction ODG Objective Difference Grade PEAQ Perceptual Evaluation of Audio Quality
31、TCX Transform coded excitation WB Wideband ETSI ETSI TS 126 274 V14.0.0 (2017-04)63GPP TS 26.274 version 14.0.0 Release 144 General Test procedures and test sequences are necessary to test for correct implementations of the Extended Adaptive Multi-Rate Wideband (AMR-WB+) codec. Clause 5 explains the
32、 procedure for conformance testing and the detailed requirements. Annex A and B explain the digital test sequences and scripts to be executed for conformance testing of AMR-WB+ codec implementations. The test sequences and scripts are attached to the present document. 5 Conformance Conformance testi
33、ng of fixed-point encoder and decoder is done by showing bit-exactness to the fixed-point reference C-code implementation (given in 3GPP TS 26.273 3) or by meeting a set of minimum objective performance requirements by means of objective measures or by subjective testing. The bit-exact approach shou
34、ld be preferred over applying objective and subjective measures if it can be achieved without undue penalty on computational complexity. Conformance may also be concluded by subjective tests, in which performance not worse than that of the reference codec (given in 3GPP TS 26.273 3) is achieved. Det
35、ails are given in clause 5.3. Floating-point implementations of encoder or decoder should be done by utilizing (compiling) the reference floating-point source code in specification (see 3GPP TS 26.304 2). In addition, as the exact behaviour of executables derived from floating-point code may depend
36、on the platform onto which it was compiled, for implementations used in mobile equipment the objective measures shall be used for verification that minimum objective performance requirements are met. For floating-point implementations, which are not used in mobile equipment the usage of the objectiv
37、e measures is recommended. Conformance may also be concluded by subjective tests, in which performance not worse than that of the reference codec (see 3GPP TS 26.304 2) is achieved. Details are given in clause 5.3. The minimum performance requirements (objective and subjective measures) are the same
38、 for all implementations (fixed- and floating-point). If an implementor chooses to implement only mono encoder functionality, then conformance of only this functionality shall be tested. As above, conformance shall be shown by applying the bit-exact approach (fixed-point encoders), or by applying ob
39、jective measures, or by subjective testing. Although the details of encoder and decoder implementation conformance testing depends on the comparison criteria given in sections 5.1 to 5.3, the following generic procedures applies for testing. A generic procedure for encoder implementation conformance
40、 testing is that the reference decoder decodes the output of implemented encoder and the resulting audio file is compared against the audio file got when the reference decoder decodes the output of reference encoder. A generic procedure for decoder implementation conformance testing is that the impl
41、emented decoder decodes the output of reference encoder and the resulting audio file is compared against the audio file got when the reference decoder decodes the output of reference encoder. ETSI ETSI TS 126 274 V14.0.0 (2017-04)73GPP TS 26.274 version 14.0.0 Release 14The conformance requirements
42、are summarised in the below table. Fixed-point Floating-point Encoder* One of the following requirements must be met: bit-exactness to the fixed-point reference C-code (given in TS 26.273) shall be shown as explained in Clause 5.1 using the test sequences included in Annex A, or the set of minimum o
43、bjective performance requirements shall be met as explained in Clause 5.2 using the test sequences included in Annex B, or the set of minimum subjective performance requirements shall be met as explained in Clause 5.3. The bit-exact approach should be preferred over applying objective or subjective
44、measures if it can be achieved without undue penalty on computational complexity. The reference floating-point source code (given in TS 26.304) shall be used (compiled). In addition: For implementations used in mobile equipment: the set of minimum objective performance requirements shall be met as e
45、xplained in Clause 5.2 using the test sequences included in Annex B, or the set of minimum subjective performance requirements shall be met as explained in Clause 5.3. For implementations not used in mobile equipment: the set of minimum objective performance requirements should be met as explained i
46、n Clause 5.2 using the test sequences included in Annex B, or the set of minimum subjective performance requirements should be met as explained in Clause 5.3. Decoder Same as for the fixed-point encoder Same as for the floating-point encoder *) If an implementor chooses to implement only mono encode
47、r functionality, then conformance of only this functionality shall be tested. 5.1 Bit-exactness The implementor should choose the bit-exact approach for fixed-point encoder/decoder implementations. For fixed-point encoder and decoder implementations, test sequences are used for conformance testing.
48、The test sequences consist of reference input audio files and corresponding reference encoder and decoder outputs. To meet the bit exact criterion all test sequences must give bit-exact result to the reference fixed-point C-code of 3GPP TS 26.273 3. The procedure is to run the encoder and decoder an
49、d check that the output (bit stream from encoder and decoded audio) is identical to the reference. Decoder only implementation conformance is checked using the reference encoder output and the reference decoder output test vectors. The test sequences are described in Annex A. ETSI ETSI TS 126 274 V14.0.0 (2017-04)83GPP TS 26.274 version 14.0.0 Release 14For the floating-point encoder and decoder implementations, executables should be derived by directly compiling the reference source code in the floating-point codec specification 3GPP TS 26.3
