1、 ETSI TS 126 274 V15.0.0 (2018-07) 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 15.0.0
2、 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 274 V15.0.0 (2018-07)13GPP TS 26.274 version 15.0.0 Release 15Reference RTS/TSGS-0426274vf00 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 348 623
3、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 content of
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9、GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 274 V15.0.0 (2018-07)23GPP TS 26.274 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The inf
10、ormation 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 th
11、e 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 t
12、he updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicat
13、ed as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical S
14、pecification (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 deliv
15、erables. 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“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be inter
16、preted 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 ETSI TS 126 274 V15.0.0 (2018-07)33GPP TS 26.274 version 15.0.0 Release 15Contents Intell
17、ectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 General . 5g35 Conformance 6g35.1 Bit-exactness 7g35.2 Objective quality measures. 8g35.2.1 Encoder . 8g35.2.1.
18、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 compliance 10g35.2.1.6 TCX-1024 mode compliance 10g35.2.1.7 ACELP/TCX switching compliance . 10g35.2.1.8 ACELP
19、/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 . 13g35.2.2.1 AMR-WB mode compliance with DTX disabled . 14g35.2.2.2 AMR-WB mode compliance with DTX enabled 14
20、g35.2.2.3 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 in stereo operation without frame erasures 15g35.2.2.6 Extension mode compliance in stereo operation with f
21、rame 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 with frame erasures 16g35.2.3 Additional objective criteria (valid for both fixed- and floating point versi
22、ons) 16g35.3 Subjective conformance testing 16g3Annex A (normative): Codec test sequences for bit exact testing of AMR-WB+ . 18g3Annex B (normative): Codec test sequences for objective testing of AMR-WB+ 19g3Annex C (informative): Change history . 20g3History 21g3ETSI ETSI TS 126 274 V15.0.0 (2018-0
23、7)43GPP TS 26.274 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration 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 t
24、he 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 appr
25、oved 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 ETSI TS 126 274 V15.0.0 (2018-07)53GPP
26、 TS 26.274 version 15.0.0 Release 151 Scope The present document specifies test procedures and digital test sequences to be used for conformance testing of implementations of the Extended Adaptive Multi-Rate Wideband (AMR-WB+) codec. 2 References The following documents contain provisions which, thr
27、ough 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 l
28、atest 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 26.290: “Audio codec processing functions; Extended Adaptive Multi
29、-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 for the fixed-point Extended Adaptive Multi-Rate - Wideband (AMR-WB+) speech codec“. 4 ITU-R Recommendat
30、ion 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 26.174: “AMR speech codec, wideband; Test sequences“. 3 Definitions and abbreviations 3.1 Definitions F
31、or 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, the following abbreviations apply: ACELP Algebraic Code Excited Linear Prediction AMR Adaptive Multi-
32、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 TCX Transform coded excitation WB Wideband 4 General ETSI ETSI TS 126 274 V15.0.0 (2018-07)63GPP TS 26
33、.274 version 15.0.0 Release 15Test 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 procedure for conformance testing and the detailed requirements. Annex A and B explain the digital te
34、st 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 testing of fixed-point encoder and decoder is done by showing bit-exactness to the fixed-point reference C-
35、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 should be preferred over applying objective and subjective measures if it can be achieved without undue pe
36、nalty 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. Details are given in clause 5.3. Floating-point implementations of encoder or decoder should be done by u
37、tilizing (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 on the platform onto which it was compiled, for implementations used in mobile equipment the objective
38、 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 objective measures is recommended. Conformance may also be concluded by subjective tests, in which performance
39、 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 for all implementations (fixed- and floating-point). If an implementor chooses to implement only mono
40、 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 objective measures, or by subjective testing. Although the details of encoder and decoder implementation
41、 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 testing is that the reference decoder decodes the output of implemented encoder and the resulting aud
42、io 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 implemented decoder decodes the output of reference encoder and the resulting audio file is compared again
43、st the audio file got when the reference decoder decodes the output of reference encoder. ETSI ETSI TS 126 274 V15.0.0 (2018-07)73GPP TS 26.274 version 15.0.0 Release 15The conformance requirements are summarised in the below table. Fixed-point Floating-point Encoder* One of the following requiremen
44、ts 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 objective performance requirements shall be met as explained in Clause 5.2 using the test sequences inc
45、luded 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 measures if it can be achieved without undue penalty on computational complexity. The reference floati
46、ng-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 explained in Clause 5.2 using the test sequences included in Annex B, or the set of minimum subjective
47、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 in Clause 5.2 using the test sequences included in Annex B, or the set of minimum subjective performanc
48、e 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 encoder functionality, then conformance of only this functionality shall be tested. 5.1 Bit-exactness The im
49、plementor 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. 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 and check that the output (bit stream from encoder and dec
