1、 ETSI TS 146 010 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Full rate speech; Transcoding (3GPP TS 46.010 version 14.0.0 Release 14) TECHNICAL SPECIFICATION G L O B AL SYST E M F O R M O B IL E CO M M U NICAT IO NSRETSI ETSI TS 146 010 V14.0.0 (2017-04) 1 3GPP TS
2、46.010 version 14.0.0 Release 14Reference RTS/TSGS-0446010ve00 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
3、) 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 modified without t
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5、esent 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/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your commen
6、t 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 photocopying and microfilm except as authorized by written permission of ETSI. The
7、 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 Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are T
8、rade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE a re 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 V14.0.0 (201
9、7-04) 2 3GPP TS 46.010 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 these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be
10、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 (https:/ipr.etsi.org/). Pursuant to the ETSI IPR
11、 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, essential to the present document. Foreword This
12、 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 identities or GSM identities. These should be interpreted as being references to the correspondin
13、g 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“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are
14、 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 direct citation. ETSI ETSI TS 146 010 V14.0.0 (2017-04) 3 3GPP TS 46.010 version 14.0.0 Release 14C
15、ontents Intellectual Property Rights 2 Foreword. 2 Modal verbs terminology . 2 Foreword. 6 1 Scope 7 1.1 References 7 1.1.1 Abbreviations . 8 1.2 Outline description . 8 1.3 Functional description of audio parts . 8 1.4 PCM Format conversion 9 1.5 Principles of the RPE-LTP encoder . 9 1.6 Principles
16、 of the RPE-LTP decoder . 10 1.7 Sequence and subjective importance of encoded parameters 10 2 Transmission characteristics 13 2.1 Performance characteristics of the analogue/digital interfaces 13 2.2 Transcoder delay 13 3 Functional description of the RPE-LTP codec . 13 3.1 Functional description o
17、f the RPE-LTP encoder . 13 3.1.1 Offset compensation . 14 3.1.2 Pre-emphasis 14 3.1.3 Segmentation 14 3.1.4 Autocorrelation 15 3.1.5 Schur Recursion . 15 3.1.6 Transformation of reflection coefficients to Log.-Area Ratios 15 3.1.7 Quantization and coding of Log.-Area Ratios 15 3.1.8 Decoding of the
18、quantized Log.-Area Ratios . 16 3.1.9 Interpolation of Log.-Area Ratios 16 3.1.10 Transformation of Log.-Area Ratios into reflection coefficients . 16 3.1.11 Short term analysis filtering . 16 3.1.12 Sub-segmentation . 17 3.1.13 Calculation of the LTP parameters . 17 3.1.14 Coding/Decoding of the LT
19、P lags 17 3.1.15 Coding/Decoding of the LTP gains 18 3.1.16 Long term analysis filtering . 18 3.1.17 Long term synthesis filtering 18 3.1.18 Weighting Filter . 19 3.1.19 Adaptive sample rate decimation by RPE grid selection 19 3.1.20 APCM quantization of the selected RPE sequence 19 3.1.21 APCM inve
20、rse quantization . 20 3.1.22 RPE grid positioning 21 3.2 Decoder 21 3.2.1 RPE decoding clause 21 3.2.2 Long Term Prediction clause . 21 3.2.3 Short term synthesis filtering clause 21 3.2.4 Post-processing 21 4 Codec homing 25 4.1 Functional description 25 4.2 Definitions . 25 4.3 Encoder homing . 26
21、 4.4 Decoder homing . 26 4.5 Encoder home state 27 4.6 Decoder home state 27 5 Computational details of the RPE-LTP codec . 27 ETSI ETSI TS 146 010 V14.0.0 (2017-04) 4 3GPP TS 46.010 version 14.0.0 Release 145.1 Data representation and arithmetic operations . 27 5.2 Fixed point implementation of the
22、 RPE-LTP coder 29 5.2.0 Scaling of the input variable . 30 5.2.1 Downscaling of the input signal . 30 5.2.2 Offset compensation . 30 5.2.3 Pre-emphasis 30 5.2.4 Autocorrelation 31 5.2.5 Computation of the reflection coefficients . 31 5.2.6 Transformation of reflection coefficients to Log.-Area Ratio
23、s 32 5.2.7 Quantization and coding of the Log.-Area Ratios 33 5.2.8 Decoding of the coded Log.-Area Ratios . 33 5.2.9 Computation of the quantized reflection coefficients . 34 5.2.9.1 Interpolation of the LARpp18 to get the LARp18. 34 5.2.9.2 Computation of the rp18 from the interpolated LARp18 34 5
24、.2.10 Short term analysis filtering . 34 5.2.11 Calculation of the LTP parameters . 35 5.2.12 Long term analysis filtering . 36 5.2.13 Weighting filter 36 5.2.14 RPE grid selection 37 5.2.15 APCM quantization of the selected RPE sequence 37 5.2.16 APCM inverse quantization . 38 5.2.17 RPE grid posit
25、ioning 39 5.2.18 Update of the reconstructed short term residual signal dp-120-1 39 5.3 Fixed point implementation of the RPE-LTP decoder . 39 5.3.1 RPE decoding clause 39 5.3.2 Long term synthesis filtering 40 5.3.3 Computation of the decoded reflection coefficients . 40 5.3.4 Short term synthesis
26、filtering clause 40 5.3.5 De-emphasis filtering . 41 5.3.6 Upscaling of the output signal 41 5.3.7 Truncation of the output variable . 41 5.4 Tables used in the fixed point implementation of the RPE-LTP coder and decoder . 42 6 Digital test sequences . 43 6.1 Input and output signals . 44 6.2 Config
27、uration for the application of the test sequences . 44 6.2.1 Configuration 1 (encoder only) 44 6.2.2 Configuration 2 (decoder only) 44 6.3 Test sequences . 45 6.3.1 Test sequences for configuration 1 . 45 6.3.2 Test sequences for configuration 2 . 46 6.3.3 Additional Test sequences for Codec Homing
28、. 50 6.3.3.1 Codec homing frames . 50 6.3.3.2 Sequence for an extensive test of the decoder homing . 50 6.3.3.3 Sequences for finding the 20 ms framing of the GSM full rate speech encoder . 50 6.3.3.4 Formats and sizes of the synchronization sequences 51 Annex A (informative): Codec performance 53 A
29、.1 Performance of the RPE-LTP 53 A.1.1 Introduction 53 A.1.2 Speech performance . 53 A.1.2.1 Single encoding 53 A.1.2.2 Speech performance when interconnected with coding systems on an analogue basis 54 A.1.2.2.1 Performance with 32 kbit/s ADPCM (G.721, superseded by G.726) . 54 A.1.2.2.2 Performanc
30、e with another RPE-LTP codec 54 A.1.2.2.3 Performance with encoding other than RPE-LTP and 32 kbit/s ADPCM (G.721, superseded by G.726) . 54 A.1.3 Non-speech performance . 55 A.1.3.1 Performance with single sine waves 55 A.1.3.2 Performance with DTMF tones 55 A.1.3.3 Performance with information ton
31、es 55 A.1.3.4 Performance with voice-band data . 55 ETSI ETSI TS 146 010 V14.0.0 (2017-04) 5 3GPP TS 46.010 version 14.0.0 Release 14A.1.4 Delay 55 A.1.5 Bibliography 57 A.2 Subjective relevance of the speech coder output bits . 57 A.3 Format for test sequence distribution . 59 A.3.1 Type of files p
32、rovided 59 A.3.2 File format description . 60 Annex B (informative): Test sequence disks 62 Annex C (informative): Change history . 63 History 64 ETSI ETSI TS 146 010 V14.0.0 (2017-04) 6 3GPP TS 46.010 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rd Genera
33、tion 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 recommendation T/L/03/11 “13 kbit/s Regular Pulse Excitation - Long Term Prediction - Linear Predict
34、ive 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 archive contains the following: Disk1.zip Annex B: Test sequences for the GSM Full Rate sp
35、eech 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 SEQ02H.*. Disk3.zip Annex B: Test sequences for the GSM Full Rate speech codec with homing
36、 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.zip Annex B: 8 bit -law test sequences for the GSM Full Rate speech codec with and withou
37、t 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 the contents of the present document, it will be re-released by the TSG with an identifyi
38、ng 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 approved document under change control. y the second digit is incremented for all changes of
39、 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 V14.0.0 (2017-04) 7 3GPP TS 46.010 version 14.0.0 Release 141 Scope The transcoding procedure specified in the
40、 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 06.01, a reference configuration for the speech transmission chain of the digital cellu
41、lar 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 network side, from the PSTN via an 8 bit/A- or -law (PCS 1900) to 13 bit uniform PCM convers
42、ion. 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 document describes the detailed mapping between input blocks of 160 speech samples in 13 bit un
43、iform 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 encoded bit stream of 13 kbit/s. The coding scheme is the so-called Regular Pulse Excitat
44、ion - 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 requirements for the audio input and output parts are included only to the extent that th
45、ey 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 use of a set of digital test sequences. These test sequences are described and are contain
46、ed 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 document. References are either specific (identified by date of publication, edition numb
47、er, 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 non-specific reference implicitly refers to the latest version
48、 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 system (Phase 2+); Channel coding“. 3 GSM 06.01: “Digital cellular telecommunications sys
49、tem (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 (ADPCM)“. 9 ITU-T Recommendation Q.35: “Technical characteristics of tones for the
