1、 ETSI TS 1Digital cellular telecoF(3GPP TS 46.0floppy3TECHNICAL SPECIFICATION146 010 V13.0.0 (2016communications system (PhaFull rate speech; Transcoding .010 version 13.0.0 Release 13GLOBAL SYSTEMOBILE COMMUN16-01) hase 2+); 13) TEM FOR ICATIONSRETSI ETSI TS 146 010 V13.0.0 (2016-01)13GPP TS 46.010
2、 version 13.0.0 Release 13Reference RTS/TSGS-0446010vd00 Keywords GSM 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-Prfecture de Grasse (06) N 78
3、03/88 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 modified without the pri
4、or 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) version kept on a specific network drive within ETSI Secretariat. Users of the present
5、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 http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the
6、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 photocopying and microfilm except as authorized by written permission of ETSI. The content of the
7、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 Telecommunications Standards Institute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETS
8、I 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 logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 146 010 V13.0.0 (2016-01)23GPP TS 46.0
9、10 version 13.0.0 Release 13Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000
10、 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 (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investig
11、ation, 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, essential to the present document. Foreword This Technical Specifica
12、tion (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.
13、 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 interpreted a
14、s 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 146 010 V13.0.0 (2016-01)33GPP TS 46.010 version 13.0.0 Release 13Contents Intellectual P
15、roperty Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g31 Scope 7g31.1 References 7g31.1.1 Abbreviations 8g31.2 Outline description . 8g31.3 Functional description of audio parts . 8g31.4 PCM Format conversion 9g31.5 Principles of the RPE-LTP encoder 9g31.6 Principles of the RPE-LTP
16、 decoder 10g31.7 Sequence and subjective importance of encoded parameters . 10g32 Transmission characteristics. 13g32.1 Performance characteristics of the analogue/digital interfaces . 13g32.2 Transcoder delay 13g33 Functional description of the RPE-LTP codec . 13g33.1 Functional description of the
17、RPE-LTP encoder 13g33.1.1 Offset compensation . 14g33.1.2 Pre-emphasis . 14g33.1.3 Segmentation 14g33.1.4 Autocorrelation . 15g33.1.5 Schur Recursion 15g33.1.6 Transformation of reflection coefficients to Log.-Area Ratios . 15g33.1.7 Quantization and coding of Log.-Area Ratios 15g33.1.8 Decoding of
18、the quantized Log.-Area Ratios 16g33.1.9 Interpolation of Log.-Area Ratios . 16g33.1.10 Transformation of Log.-Area Ratios into reflection coefficients 16g33.1.11 Short term analysis filtering 16g33.1.12 Sub-segmentation . 17g33.1.13 Calculation of the LTP parameters . 17g33.1.14 Coding/Decoding of
19、the LTP lags 17g33.1.15 Coding/Decoding of the LTP gains 18g33.1.16 Long term analysis filtering 18g33.1.17 Long term synthesis filtering 18g33.1.18 Weighting Filter 19g33.1.19 Adaptive sample rate decimation by RPE grid selection 19g33.1.20 APCM quantization of the selected RPE sequence . 19g33.1.2
20、1 APCM inverse quantization 20g33.1.22 RPE grid positioning . 21g33.2 Decoder 21g33.2.1 RPE decoding clause 21g33.2.2 Long Term Prediction clause 21g33.2.3 Short term synthesis filtering clause . 21g33.2.4 Post-processing . 21g34 Codec homing 25g34.1 Functional description 25g34.2 Definitions 25g34.
21、3 Encoder homing . 26g34.4 Decoder homing . 26g34.5 Encoder home state 27g34.6 Decoder home state 27g3ETSI ETSI TS 146 010 V13.0.0 (2016-01)43GPP TS 46.010 version 13.0.0 Release 135 Computational details of the RPE-LTP codec 27g35.1 Data representation and arithmetic operations . 27g35.2 Fixed poin
22、t implementation of the RPE-LTP coder . 29g35.2.0 Scaling of the input variable . 30g35.2.1 Downscaling of the input signal . 30g35.2.2 Offset compensation . 30g35.2.3 Pre-emphasis . 30g35.2.4 Autocorrelation . 31g35.2.5 Computation of the reflection coefficients 31g35.2.6 Transformation of reflecti
23、on coefficients to Log.-Area Ratios . 32g35.2.7 Quantization and coding of the Log.-Area Ratios 33g35.2.8 Decoding of the coded Log.-Area Ratios 33g35.2.9 Computation of the quantized reflection coefficients . 34g35.2.9.1 Interpolation of the LARpp18 to get the LARp18 . 34g35.2.9.2 Computation of th
24、e rp18 from the interpolated LARp18 . 34g35.2.10 Short term analysis filtering 34g35.2.11 Calculation of the LTP parameters . 35g35.2.12 Long term analysis filtering 36g35.2.13 Weighting filter . 36g35.2.14 RPE grid selection 37g35.2.15 APCM quantization of the selected RPE sequence . 37g35.2.16 APC
25、M inverse quantization 38g35.2.17 RPE grid positioning . 39g35.2.18 Update of the reconstructed short term residual signal dp-120-1 . 39g35.3 Fixed point implementation of the RPE-LTP decoder . 39g35.3.1 RPE decoding clause 39g35.3.2 Long term synthesis filtering 40g35.3.3 Computation of the decoded
26、 reflection coefficients . 40g35.3.4 Short term synthesis filtering clause . 40g35.3.5 De-emphasis filtering 41g35.3.6 Upscaling of the output signal 41g35.3.7 Truncation of the output variable 41g35.4 Tables used in the fixed point implementation of the RPE-LTP coder and decoder 42g36 Digital test
27、sequences . 43g36.1 Input and output signals . 44g36.2 Configuration for the application of the test sequences 44g36.2.1 Configuration 1 (encoder only) . 44g36.2.2 Configuration 2 (decoder only) . 44g36.3 Test sequences 45g36.3.1 Test sequences for configuration 1 . 45g36.3.2 Test sequences for conf
28、iguration 2 . 46g36.3.3 Additional Test sequences for Codec Homing 50g36.3.3.1 Codec homing frames . 50g36.3.3.2 Sequence for an extensive test of the decoder homing 50g36.3.3.3 Sequences for finding the 20 ms framing of the GSM full rate speech encoder . 50g36.3.3.4 Formats and sizes of the synchro
29、nization sequences 51g3Annex A (informative): Codec performance 53g3A.1 Performance of the RPE-LTP . 53g3A.1.1 Introduction 53g3A.1.2 Speech performance . 53g3A.1.2.1 Single encoding 53g3A.1.2.2 Speech performance when interconnected with coding systems on an analogue basis 54g3A.1.2.2.1 Performance
30、 with 32 kbit/s ADPCM (G.721, superseded by G.726) . 54g3A.1.2.2.2 Performance with another RPE-LTP codec 54g3A.1.2.2.3 Performance with encoding other than RPE-LTP and 32 kbit/s ADPCM (G.721, superseded by G.726) . 54g3A.1.3 Non-speech performance 55g3A.1.3.1 Performance with single sine waves . 55
31、g3A.1.3.2 Performance with DTMF tones 55g3ETSI ETSI TS 146 010 V13.0.0 (2016-01)53GPP TS 46.010 version 13.0.0 Release 13A.1.3.3 Performance with information tones . 55g3A.1.3.4 Performance with voice-band data 55g3A.1.4 Delay 55g3A.1.5 Bibliography . 57g3A.2 Subjective relevance of the speech coder
32、 output bits . 57g3A.3 Format for test sequence distribution . 59g3A.3.1 Type of files provided 59g3A.3.2 File format description . 60g3Annex B (informative): Test sequence disks 62g3Annex C (informative): Change history . 63g3History 64g3ETSI ETSI TS 146 010 V13.0.0 (2016-01)63GPP TS 46.010 version
33、 13.0.0 Release 13Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The present document specifies the full rate speech transcoding within the digital cellular telecommunications system. NOTE: The present document is a reproduction of recommenda
34、tion T/L/03/11 “13 kbit/s Regular Pulse Excitation - Long Term Prediction - Linear Predictive Coder for use in the digital cellular telecommunications system“. Archive en_300961v080101p0.ZIP which accompanies the present document, contains test sequences, as described in clause 6 and annex A.3. The
35、archive contains the following: Disk1.zip Annex B: Test sequences for the GSM Full Rate speech codec; Test sequences SEQ01.xxx to SEQ05.xxx. (Disk1.zip contains LHA compressed files.) Disk2.zip Annex B: Test sequences for the GSM Full Rate speech codec with homing frames; Test sequences SEQ01H.* to
36、SEQ02H.*. Disk3.zip Annex B: Test sequences for the GSM Full Rate speech codec with homing frames; Test sequences SEQ03H.* to SYNC159.COD. Disk4.zip Annex B: 8 bit A-law test sequences for the GSM Full Rate speech codec with and without homing frames (Disk4.zip contains self-extracting files). Disk5
37、.zip Annex B: 8 bit -law test sequences for the GSM Full Rate speech codec with and without homing frames (Disk5.zip contains self-extracting files). 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
38、 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 ap
39、proved 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 146 010 V13.0.0 (2016-01)73G
40、PP TS 46.010 version 13.0.0 Release 131 Scope The transcoding procedure specified in the present document is applicable for the full-rate Traffic Channel (TCH) in the digital cellular telecommunications system. The use of this transcoding scheme for other applications has not been considered. In GSM
41、 06.01, a reference configuration for the speech transmission chain of the digital cellular telecommunications system is shown. According to this reference configuration, the speech encoder takes its input as a 13 bit uniform PCM signal either from the audio part of the mobile station or on the netw
42、ork side, from the PSTN via an 8 bit/A- or -law (PCS 1900) to 13 bit uniform PCM conversion. The encoded speech at the output of the speech encoder is delivered to a channel encoder unit which is specified in GSM 05.03. In the receive direction, the inverse operations take place. The present documen
43、t describes the detailed mapping between input blocks of 160 speech samples in 13 bit uniform PCM format to encoded blocks of 260 bits and from encoded blocks of 260 bits to output blocks of 160 reconstructed speech samples. The sampling rate is 8000 sample/s leading to an average bit rate for the e
44、ncoded bit stream of 13 kbit/s. The coding scheme is the so-called Regular Pulse Excitation - Long Term prediction - Linear Predictive Coder, here-after referred to as RPE-LTP. The present document also specifies the conversion between A- and -law (PCS 1900) PCM and 13 bit uniform PCM. Performance r
45、equirements for the audio input and output parts are included only to the extent that they affect the transcoder performance. The present document also describes the codec down to the bit level, thus enabling the verification of compliance to the present document to a high degree of confidence by us
46、e of a set of digital test sequences. These test sequences are described and are contained in archive en_300961v080101p0.ZIP which accompanies the present document. 1.1 References The following documents contain provisions which, through reference in this text, constitute provisions of the present d
47、ocument. 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 (inc
48、luding 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 GSM 01.04: “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. 2 GSM 05.03: “Digital cellular telecommunications s
49、ystem (Phase 2+); Channel coding“. 3 GSM 06.01: “Digital cellular telecommunications system (Phase 2+); Full rate speech; Processing functions“. 4 GSM 11.10: “Digital cellular telecommunications system (Phase 2+); Mobile Station (MS) conformity specification“. 5 Void. 6 ITU-T Recommendation G.711: “Pulse code modulation (PCM) of voice frequencies“. 7 ITU-T Recommendation G.712: “Transmission performance characteristics of pulse code modulation“. 8 ITU-T Recommendation G.726: “40, 32, 24, 16 kbit/s adaptive differential pulse code modulation
