1、 International Telecommunication Union ITU-T G.729.1TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 8(03/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Coding of voice and audio signals G.729-based embedded variable bit-rate coder:
2、An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729 Amendment 8: New Annex G describing an alternative floating-point implementation of the superwideband monaural extension Recommendation ITU-T G.729.1 (2006) Amendment 8 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND M
3、EDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERIS
4、TICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 G
5、eneral G.700G.709 Coding of voice and audio signals G.710G.729Principal characteristics of primary multiplex equipment G.730G.739 Principal characteristics of second order multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristic
6、s of transcoder and digital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NE
7、TWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.899
8、9 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.729.1 (2006)/Amd.8 (03/2013) i Recommendation ITU-T G.729.1 G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729 Amen
9、dment 8 New Annex G describing an alternative floating-point implementation of the superwideband monaural extension Summary Amendment 8 to ITU-T G.729.1 adds new Annex G that describes an alternative floating-point implementation of the superwideband monaural extension described in Annex E. Annex G
10、has, as electronic attachments, the reference ANSI C-source code and associated test vectors. The latter can be downloaded from the ITU-T Test Signal Database at http:/itu.int/net/ITU-T/sigdb/speaudio/Gseries.htm#G.729.1. History Edition Recommendation Approval Study Group 1.0 ITU-T G.729.1 2006-05-
11、29 16 1.1 ITU-T G.729.1 (2006) Amd. 1 2007-01-13 16 1.2 ITU-T G.729.1 (2006) Amd. 2 2007-02-13 16 1.3 ITU-T G.729.1 (2006) Amd. 3 2007-08-29 16 1.4 ITU-T G.729.1 (2006) Amd. 4 2008-06-29 16 1.5 ITU-T G.729.1 (2006) Amd. 5 2008-12-07 16 1.6 ITU-T G.729.1 (2006) Cor.1 2009-08-29 16 1.7 ITU-T G.729.1 (
12、2006) Amd. 6 2010-03-29 16 1.8 ITU-T G.729.1 (2006) Amd. 7 2012-02-29 16 1.9 ITU-T G.729.1 (2006) Amd. 8 2013-03-16 16 ii Rec. ITU-T G.729.1 (2006)/Amd.8 (03/2013) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, in
13、formation and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a
14、worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down
15、in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication ad
16、ministration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory p
17、rovisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attenti
18、on to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others o
19、utside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the lat
20、est information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.729.1 (2006)/Amd.8 (03/
21、2013) 1 Recommendation ITU-T G.729.1 G.729-based embedded variable bit-rate coder: An 8-32 kbit/s scalable wideband coder bitstream interoperable with G.729 Amendment 8 New Annex G describing an alternative floating-point implementation of the superwideband monaural extension Add the following new A
22、nnex G to ITU-T G.729.1 (2006) Annex G Reference floating-point implementation of the superwideband monaural extension as an alternative to the fixed-point implementation described in Annex E (This annex forms an integral part of this Recommendation.) G.1 Scope This annex1describes an alternative im
23、plementation of the ITU-T G.729.1 Annex E (superwideband scalable extension for G.729.1) codec based on floating-point arithmetic. It is fully interoperable with the ITU-T G.729.1 Annex E codec. This annex includes an electronic attachment containing the reference ANSI C source code for floating-poi
24、nt implementation, as well as the associated test vectors. G.2 Overview Annex E of this Recommendation provides a bit-exact, fixed-point specification of an algorithm for extending the ITU-T G.729.1 codec for superwideband speech and audio signals operating at the total bit rates of 36, 40, 48, 56 a
25、nd 64 kbit/s. Exact details of these specifications are given in a bit-exact, fixed-point C-code available from ITU-T. This annex describes and defines an alternative implementation of the ITU-T G.729.1 Annex E codec based on floating-point arithmetic. G.3 Algorithm description This floating-point v
26、ersion of the ITU-T G.729.1 Annex E codec has the same algorithm steps as the fixed-point version. Similarly, the bitstream is identical to that of the ITU-T G.729.1 Annex E codec. For algorithmic details, see ITU-T G.729.1 Annex E. _ 1This annex includes an electronic attachment containing the rela
27、ted ANSI C code. 2 Rec. ITU-T G.729.1 (2006)/Amd.8 (03/2013) G.4 ANSI C-code ANSI C-code simulating the floating-point version of the ITU-T G.729.1 Annex E codec defined in this annex has been developed and is available as an electronic attachment to this Recommendation. The ANSI C-code represents t
28、he normative specification of this annex. The algorithmic description given by the C-code shall take precedence over the text contained in the main body of this Recommendation. As of the date of approval of this text, the current version of this ANSI C-code is version 1.0 of January 2013. More recen
29、t versions may become available through corrigenda or amendments to this Recommendation. It is important to make sure to use the latest available version from the ITU-T website. The structure of the floating-point source code faithfully follows the corresponding fixed-point source code. The code is
30、written in ANSI-C. The codec is implemented as two separate programs: encoder options R input_audio_file bitstream_file decoder options R bitstream_file output_audio_file where R is the input/output sampling rate in kHz. The following options are defined for the encoder: -rXXXXX : Encoding bit rate,
31、 XXXXX = 32000, 36000, 40000, 48000, 56000, 64000 (default) bps * -g729_bst : G.729 8 kbit/s interoperable bitstream -quiet : Quiet processing The following options are defined for the decoder: -rXXXXX : Maximum decoded bit rate, BR = 32000, 36000, 40000, 48000, 56000, 64000 (default) bps * -g729_bs
32、t : G.729 interoperable bitstream (compatible with G.729 and G.729 Annex B) -quiet : Quiet processing * From 8000bps to 32000bps, the following bit rates are supported as G.729.1 supports these bit rates; 8000, 12000, 14000, 16000, 18000, 20000, 22000, 24000, 26000, 28000, 30000, 32000. The codec di
33、rectory structure is as follows: + /bin_msvc/ will be created for containing Microsoft Visual C+ 2008 executables. + /bin_cygwin/ will be created for containing Cygwin gcc executables. + /bin_linux/ will be created for containing Linux gcc executables. + /src/g729/ contains source files used with th
34、e ITU-T G.729 subroutines. + /src/celp2s/ contains source files used with the ITU-T G.729.1 embedded CELP subroutines. + /src/fec/ contains source files used with the ITU-T G.729.1 FEC subroutines. + /src/tdbwe/ contains source files used with the ITU-T G.729.1 TDBWE subroutines. + /src/tdac/ contai
35、ns source files used with the ITU-T G.729.1 TDAC subroutines. + /src/SWB/ contains source files used with the superwideband extension. + /src/GLCVQ/ contains source files used with the GLCVQ subroutines. + /src/music_enh_lib/ contains source files used only with the music enhancement. Rec. ITU-T G.7
36、29.1 (2006)/Amd.8 (03/2013) 3 + /src/lib_wmops/ contains complexity estimation tools. + /src/main/ contains the main routines of the encoder and the decoder. + /workspace/VC2008/ contains MSVC+2008 workspace “g7291_swb.sln“ and projects. + /workspace/makefile is the Cygwin/Linux gcc makefile. The fi
37、le format of the supplied binary data is 16-bit binary data which is read and written in 16-bit little-endian words. The bitstream follows the ITU-T G.192 format. For every 20-ms input speech frame, the bitstream contains the following 16-bit unsigned short integer data: SyncWord DataLen 1st Databit
38、 2nd DataBit . . . Nth DataBit Each bit is presented as follows: Bit 0 = 0x007F, Bit 1 = 0x0081. The SyncWord from the encoder is always 0x6B21. The SyncWord 0x6B20 on the decoder side indicates that the frame was corrupted. The DataLen parameter gives the number of transmitted source bits in the fr
39、ame. Printed in Switzerland Geneva, 2013 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G
40、 Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series
41、L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipme
42、nt Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
