1、 ETSI TS 126 406 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; General audio codec audio processing functions; Enhanced aacPlus general audio codec; Conformance testing (3GPP TS 26.406 version 15.0.0 Release 15)
2、 TECHNICAL SPECIFICATION ETSI ETSI TS 126 406 V15.0.0 (2018-07)13GPP TS 26.406 version 15.0.0 Release 15Reference RTS/TSGS-0426406vf00 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 348 623 562 00017 -
3、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 any electro
4、nic 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 Document Format (PDF)
5、version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverab
6、leStatus.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 mechanical, including p
7、hotocopying 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. ETSI 2018. All rights reserved. DECTTM, PLUGT
8、ESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are
9、 trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 406 V15.0.0 (2018-07)23GPP TS 26.406 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 information per
10、taining 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 the ETSI Secre
11、tariat. 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 the updates o
12、n 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 indicated as being
13、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 Specification
14、 (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 deliverables. The
15、 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 interpreted as de
16、scribed 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 126 406 V15.0.0 (2018-07)33GPP TS 26.406 version 15.0.0 Release 15Contents Intellectual Prope
17、rty Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 Normative references . 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 General . 6g35 Decoder conformance testing . 6g35.1 AAC-LC, SBR and Parametric Stereo conformance testing 6g35.
18、2 void . 6g36 Encoder conformance . 6g36.1 Floating point encoder 6g36.2 Fixed point encoder 6g36.2.1 Bit-exact Behaviour 7g36.2.2 Objective criteria 7g36.2.2.1 AAC encoder conformance . 7g36.2.2.2 SBR encoder conformance 8g36.2.2.3 PS encoder conformance . 9g36.2.3 Subjective criteria . 9g3Annex A:
19、 Void 10g3Annex B (normative): Test vectors for fixed-point encoder conformance 11g3Annex C (informative): Change history . 12g3History 13g3ETSI ETSI TS 126 406 V15.0.0 (2018-07)43GPP TS 26.406 version 15.0.0 Release 15Foreword This Technical Specification (TS) has been produced by the 3rdGeneration
20、 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 a
21、n 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 enha
22、ncements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 406 V15.0.0 (2018-07)53GPP TS 26.406 version 15.0.0 Release 151 Scope The present document specifies the digital test sequences and conformance c
23、riteria for the Enhanced aacPlus audio codec. 2 Normative 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, e
24、tc.) 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
25、 in the same Release as the present document. 1 3GPP TS 26.401: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; General description“. 2 3GPP TS 26.403: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Encoder specification;
26、 Advanced Audio Coding (AAC) part“. 3 3GPP TS 26.404: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Encoder specification; Spectral Band Replication (SBR) part“. 4 3GPP TS 26.405: “General audio codec audio processing functions; Enhanced aacPlus general audio
27、 codec; Encoder specification; Parametric stereo part“. 5 3GPP TS 26.410: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Floating-point ANSI-C code“. 6 3GPP TS 26.411: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Fixed
28、-point ANSI-C code“. 7 ISO/IEC 14496-4:2004: “Information technology - Coding of audio-visual objects - Part 4: Conformance testing“. 8 ISO/IEC 14496-4:2004/Amd.8:2005: “Information technology - Coding of audio-visual objects - Part 4: Conformance testing Amendment 8: High Efficiency Advanced Audio
29、Coding, audio BIFS, and structured audio conformance“. 9 ITU-R Recommendation BS.1387-1: “Method for objective measurements of PErceived Audio Quality (PEAQ)“. 10 ISO/IEC 14496-4:2004/Amd.11:2006 “Information technology - Coding of audio-visual objects - Part 4: Conformance testing - Amendment 11: P
30、arametric Stereo conformance“. 11 ISO/IEC 14496-4:2004/Amd.11:2006/Cor.2:2007 “Information technology - Coding of audio-visual objects - Part 4: Conformance testing - Amendment 11: Parametric Stereo conformance Technical Corrigendum 2“. ETSI ETSI TS 126 406 V15.0.0 (2018-07)63GPP TS 26.406 version 1
31、5.0.0 Release 153 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TS 26.401 1, 3GPP TS 26.403 2, 3GPP TS 26.404 3, 3GPP TS 26.405 4, 3GPP TS 26.410 5and 3GPP TS 26.411 6 apply. 3.2 Abbreviations For the purposes of the p
32、resent document, the following abbreviations apply: AAC-LC Advanced Audio Coding-Low Complexity audio object type ODG Objective Difference Grade PEAQ Perceptual Evaluation of Audio Quality SBR Spectral Band Replication 4 General Conformance testing is an important tool to verify that implementations
33、 of Enhanced aacPlus match the relevant specifications. It is also helpful in verifying the proper use of the source code provided in 3GPP TS 26.410 5 and 3GPP TS 26.411 6. Conformance testing focuses on the core algorithm, therefore no criteria are defined for error concealment, downsampling and fi
34、le I/O. Clause 5 describes the proposed method of conformance testing for the decoder. Clause 6 discusses encoder conformance. 5 Decoder conformance testing Decoder conformance for both fixed-point and floating-point implementations shall be tested in accordance with clause 5.1. Conformance shall be
35、 verified by either bit-exact behaviour to the reference output or by meeting the objective criteria defined below. Bit-exact behaviour should be preferred for fixed-point implementations where it can be achieved without undue penalty on computational complexity. 5.1 AAC-LC, SBR and Parametric Stere
36、o conformance testing Conformance testing for AAC-LC, SBR and Parametric Stereo shall be performed according to the relevant clauses in ISO/IEC 14496-4 7, 8, 10, 11. 3GPP conformance shall not be claimed for implementations achieving an accuracy level of K L/R unmapping. The comparison however takes
37、 place in the log-domain. For higher energies only low deviations are allowed, while lower energies are permitted to deviate more: Differences of up to 3dB are allowed for all energies, differences of up to 6dB are allowed for energies up to 42 dB below a full scale sine, differences of up to 9 dB a
38、re allowed for energies up to 60 dB below a full scale sine. - The test of the transient detector is performed by comparing the bitstream element sbr_grid() from both encoders. The RMS of the difference between the transient position vector of the encoder under test and the reference encoder shall n
39、ot be greater than 0.2. - The test of the missing harmonics detector is carried out by comparing the bitstream elements sbr_sinusoidal_coding() from both encoders. The vector that is constructed by subtracting the missing harmonics vectors from both bitstreams and concatenating the result over all f
40、rames shall not have an RMS greater than 0.2. - The test of the whitening level detector is performed by comparing the bitstream element sbr_invf() from both encoders. The vector that is constructed by subtracting the whitening level vectors of the encoder under test and the reference encoder shall
41、not have an RMS greater than 0.2. - The test for the noise floor estimator module is identical to the test for the envelope energy conformance test, except that the actual noise floor energies are compared instead of the envelope energies. The maximum permissible noise floor energy difference for a
42、given deviation between reference encoder and encoder under test are as follows: Differences of up to 6 dB are allowed for all energies, differences of up to 9 dB are allowed for energies up to 42 dB below a full scale sine, differences of up to 12 dB are allowed for energies up to 60 dB below a ful
43、l scale sine. ETSI ETSI TS 126 406 V15.0.0 (2018-07)93GPP TS 26.406 version 15.0.0 Release 156.2.2.3 PS encoder conformance All comparisons shall be limited to frames and bands in the bitstream that contain an energy greater than -87 dB below a full-scale sine. Prior to the actual conformance test,
44、the stereo parameters from both encoders are mapped to the highest available stereo frequency resolution. - the signal that is constructed from the differences between all IID values signaled by the encoder under test and the reference encoder shall have a maximum absolute difference of 2 and the RM
45、S must not exceed 0.25 - the signal that is constructed from the differences between all ICC values signaled by the encoder under test and the reference encoder shall have a maximum absolute difference of 2 and the RMS must not exceed 0.25 6.2.3 Subjective criteria Subjective tests shall cover the e
46、ncoder configurations tested during the characterization phase. The requirement for passing the subjective tests is that the encoder under test does not perform worse in a statistically significant sense in any test case when compared to the fixed-point reference encoder. ETSI ETSI TS 126 406 V15.0.
47、0 (2018-07)103GPP TS 26.406 version 15.0.0 Release 15Annex A: Void Table 1: Void ETSI ETSI TS 126 406 V15.0.0 (2018-07)113GPP TS 26.406 version 15.0.0 Release 15Annex B (normative): Test vectors for fixed-point encoder conformance Table 2: Testvectors specifically relevant for the objective testing
48、of the AAC tool # Test vector file name 1 ct_castagnettes.wav 2 ct_glockenspiel.wav 3 ct_test_1_48.wav 4 ct_test_2_48.wav 5 ct_test_3_48.wav 6 cymbal.wav 7 gong.wav 8 guitar_1.wav 9 guitar_2.wav 10 guitar_cymbals.wav 11 handcuff.wav 12 hihat.wav 13 laugh.wav 14 shaker.wav 15 speech_female.wav 16 spe
49、ech_male_german.wav 17 speech_male_portuguese.wav 18 triangle.wav 19 wooden_toys_1.wav 20 wooden_toys_2.wav Table 3: Testvectors specifically relevant for the objective testing of the SBR tool # Test vector file name SBR module 21 noise_fade.wav Envelope 12 hihat.wav Transients1 ct_castagnettes.wav Transients 22 sines.wav Sines21 noise_fade.wav Noise 23 invf.wav WhiteningTable 4: Testvectors specifically relevant for the objective testing of the PS tool # Test vector file name PS parameter 3 ct_test_1_48.wav IID 2 ct_glockenspiel
