1、 ETSI TR 126 936 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Performance characterization of 3GPP audio codecs (3GPP TR 26.936 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 936 V15.0.0 (2018-07)
2、13GPP TR 26.936 version 15.0.0 Release 15Reference RTR/TSGS-0426936vf00 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 - NAF 742 C Association but non lucratif enregistre la Sous-Prfec
3、ture 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 electronic and/or print versions of the present document shall not be
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9、TSI TR 126 936 V15.0.0 (2018-07)23GPP TR 26.936 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 pertaining to these essential IPRs, if any, is publicly available
10、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. Latest updates are available on the ETSI Web server (ht
11、tps:/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 Web server) which are, or may be, or may become, ess
12、ential 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 the property of ETSI, and conveys no right to use or reproduce
13、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 Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3G
14、PP). 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 cross reference between GSM, UMTS, 3GPP and ETSI identities can be fo
15、und under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “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 provisi
16、ons). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 936 V15.0.0 (2018-07)33GPP TR 26.936 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References
17、 6g33 Abbreviations . 6g34 Subjective test results . 7g34.1 Organization of the subjective test results 7g34.2 Subjective test method 9g35 Performance Characterization for Audio Content 10g35.1 Results from characterization phase 1 10g35.2 Results from Characterization phase 2 . 11g35.3 Results from
18、 Selection Test 13g36 Performance characterization over bit-rate 15g37 Performance based on Selection Tests . 16g37.1 Intrinsic quality comparison in lower bit-rate range (up to 24 kbps) . 16g37.2 Quality comparison under stressed operating conditions at lower bit-rates (up to 24 kbps) 18g37.3 Perfo
19、rmance evaluation in higher bit-rate range (up to 48 kbps) . 19g38 Performance characterization for error conditions . 19g39 Results of verification tests 22g39.1 Complexity verification 22g39.1.1 AMR-WB+ complexity 22g39.1.2 Eaac+ Complexity 22g39.2 Frequency response verification . 23g39.2.1 Frequ
20、ency response of AMR-WB+ 23g39.2.1.1 Characterization phase configuration 23g39.2.1.2 Selection phase configuration . 27g39.2.2 Frequency response of Eaac+ . 30g39.3 Codec delay verification . 33g39.3.1 AMR-WB+ codec delay . 33g39.3.2 Eaac+ codec delay 34g39.4 Performance verification with 3D audio
21、signal 36g39.5 Verification of rate switching performance 40g39.5.1 Rate switching performance of AMR-WB+ . 40g39.5.2 Rate switching performance of Eaac+ 40g39.6 Verification of source code 41g39.6.1 Source code verification of AMR-WB+ . 41g39.6.2 Source code verification of Eaac+ 44g39.6.3 General
22、discussion 47g39.7 Content dependency . 48g3Annex A: Test results from other bodies . 49g3A.1 Test results from ITU-T standardization of G.722-1, annex C 49g3Annex B: Documents for information 51g3B.1 Official testing documents (file TR26.936 Annex B1 Official Test Documents.zip) . 51g3B.2 Additiona
23、l information documents (file TR26.936 Annex B2 Additional Documents.zip) 51g3B.3 Verification test documents (file TR26.936 Annex B3 Verification test documents.zip) 52g3ETSI ETSI TR 126 936 V15.0.0 (2018-07)43GPP TR 26.936 version 15.0.0 Release 15Annex C: Change history 53g3History 54g3ETSI ETSI
24、TR 126 936 V15.0.0 (2018-07)53GPP TR 26.936 version 15.0.0 Release 15Foreword This Technical Report 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. Shou
25、ld 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
26、 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 ETSI TR 126 936 V15
27、.0.0 (2018-07)63GPP TR 26.936 version 15.0.0 Release 151 Scope The present document comprises the Technical Report for the Characterization of the 3GPP Audio Codecs, Enhanced aacPlus (Eaac+) and Extended AMR-WB (AMR-WB+), standardized by 3GPP in Release 6 for Packet-switched Streaming Service (PSS),
28、 Multimedia Messaging Service (MMS), Multimedia Broadcast and Multicast Service (MBMS), and IMS Messaging Service and Presence Service. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are eithe
29、r 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
30、 non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 ITU-R Recommendation BS.1534-1 (2003): “Method for the subjective assessment of intermediate quality level of coding systems“. 2 ISO/IEC JTC1/SC29/WG11/N5571 (2003): “Repor
31、t on Informal MPEG-4 Extension 1 (Bandwidth Extension) Verification Tests“. 3 Tech 3296 (2003): “EBU Subjective listening tests on low bit-rate audio codecs“. 4 3GPP TS 26.273: “ANSI-C code for the fixed-point Extended Adaptive Multi-Rate - Wideband (AMR-WB+) speech codec“. 5 3GPP TS 26.290: “Audio
32、codec processing functions; Extended Adaptive Multi-Rate - Wideband (AMR-WB+) codec; Transcoding functions“. 6 3GPP TS 26.410: “General audio codec audio processing functions; Enhanced aacPlus general audio codec; Floating-point ANSI-C code“. 7 3GPP TS 26.411: “General audio codec audio processing f
33、unctions; Enhanced aacPlus general audio codec; Fixed-point ANSI-C code“. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: ACR Absolute Category Rating method AMR-WB+ Extended AMR-WB BLER Block Error Rate DCR Degradation Category Rating method DMOS Degrada
34、tion Mean Opinion Score Eaac+ Enhanced aacPlus EBU European Broadcasting Union EGPRS Enhanced General Packet Radio Service FEC Forward Error Correction FER Frame Error Rate HRTF Head Related Transfer Function ISF Internal Sampling FrequencyITU-T International Telecommunications Union - Telecommunica
35、tions MBMS Multi-media Broadcast and Multicast Services MMS Multi-media Messaging Service MOS Mean Opinion Score ETSI ETSI TR 126 936 V15.0.0 (2018-07)73GPP TR 26.936 version 15.0.0 Release 15MPEG Moving Picture Experts Group MUSHRA Multiple Stimulus with Hidden Reference and Anchors method PLR Pack
36、et Loss RatePSS Packet-switched Streaming Service ROHC Robust Header Compression RTP Real-time transport protocol RLC-PDU Radio Link Control - Protocol Data Unit SEAQ System for the Evaluation of Audio Quality UTRAN UMTS Terrestrial Radio Access Network 4 Subjective test results The main body of the
37、 present document summarizes the results from official tests conducted by 3GPP. Further subjective test results were provided into the standardization process by various parties. Some of these results were part of the verification tasks. Two other contributions from codec proponents assessing the co
38、decs across different bit rates in the low rate segment up to 24 kbps were provided in earlier phases of the process and are also attached to the present document (see S4-040439 and S4-040710 in attachment “TR 26.936 Annex B2 Additional Documents.zip“). In addition, there are further reports from ot
39、her bodies. Clause A.1 comprises test results for the two standardized codecs carried out by ITU-T, where the 3GPP audio codecs served as reference codecs. The Annex also contains references to tests on Eaac+ carried out in MPEG and EBU, which provide information for configurations using the Eaac+ d
40、ecoder in combination with a non-standardized encoder. In the reporting of subjective test results, it is generally agreed that comparisons of results are valid only for conditions conducted within the same experiment. It is not valid, for example, to directly or statistically compare subjective tes
41、t results for one codec across two bit-rates when those results have been obtained from different experiments. In general, this principle will be observed in the subjective test results presented in the following clauses. 4.1 Organization of the subjective test results This report comprises data fro
42、m subjective tests derived from standardization exercises organized in 3GPP. Each of the test exercises was conducted in accordance with a test plan and results were provided in a test report. Table 1 summarizes these test exercises including a series label, a description of the tests, and the speci
43、fic Attachments containing the appropriate test plans and test reports. Table 1: Subjective Test Series involved in the Technical Report Standardization exercise Label Test plan Test report 3GPP audio codec characterization test, phase 1 CT-P1 Attachment 1A Attachment 1B 3GPP audio codec characteriz
44、ation test, phase 2 CT-P2 Attachment 1A Attachment 1C 3GPP audio codec low rate selection test ST-LR Attachment 1D Attachment 1E 3GPP audio codec high rate selection test ST-HR Attachment 1F Attachment 1G Table 2 lists the subjective tests that provided the results reported in the present document i
45、ncluding details such as the test parameters, mode (mono vs. stereo), and number of listening labs. All of the subjective tests described in this report involved some common test parameters. These include the use of 15 subjects and 12 test items where the test items are sub-divided into three classe
46、s of Audio Content - four items each for Music-only, Speech-only, and Mixed Music+Speech audio content. All experiments in CT-P1 and CT-P2 used the same 12 items of material. The ST-LR tests used 24 items in each experiment, but the test items were split into two sets of 12 test items and allocated
47、across to different labs running the same experiment. All experiments in ST-HR used the same 12 test items. ETSI ETSI TR 126 936 V15.0.0 (2018-07)83GPP TR 26.936 version 15.0.0 Release 15Table 2: Summary of subjective tests involved in the Technical Report Series Test parameter(s) Mode # Labs CT-P1
48、3 bit-rates mono 2 3 bit-rates stereo 2 CT-P2 4 PLRs, EGPRS mono 1 4 PLRs, EGPRS stereo 1 3 PLRs, UTRAN - Lower rates stereo 1 3 PLRs, UTRAN - Higher rates stereo 1 ST-LR 14 kbps, PSS mono 4 18 kbps, PSS stereo 4 24 kbps, PSS mono 4 24 kbps, PSS stereo 4 14 kbps, MMS, 16 kHz sampling rate mono 4 18
49、kbps, MMS stereo 4 14 kbps, PSS, 3 % FER mono 4 24 kbps, MMS, 3 % FER stereo 4 ST-HR 32 kbps, PSS stereo 2 48 kbps, PSS stereo 2 32 kbps, PSS, 1 % and 3 % FER stereo 2 It should be noted that, for both audio codecs, the codecs used in the Characterization Test (i.e. CT-P1 and CT-P2 test series) were different (e.g., bug fixes, optimized configurations) from the candidate codecs used in the earlier Selection Test (i.e. ST-LR and ST-HR test series). The Selection test results also provide information how the selected codecs perform in relation to Release 5 aud
