1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T G.722 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (10/2014) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Coding of voice and audio signals 7 kHz audio-co
2、ding within 64 kbit/s Amendment 1: New Annex E An alternative implementation of stereo super-wideband extension using floating point Recommendation ITU-T G.722 (2012) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNE
3、CTIONS 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 CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY O
4、R 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 General G.700G.709 Coding of voice and audio signals G.710G.729 P
5、rincipal 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 characteristics of transcoder and digital multiplication equipment G.760G.769
6、 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 NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.90
7、0G.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.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refe
8、r to the list of ITU-T Recommendations. Rec. ITU-T G.722 (2012)/Amd.1 (10/2014) i Recommendation ITU-T G.722 7 kHz audio-coding within 64 kbit/s Amendment 1 New Annex E An alternative implementation of stereo super-wideband extension using floating point Summary Amendment 1 to ITU-T G.722 introduces
9、 Annex E, which provides a list of software routines, their description and associated C-code for a reference floating-point implementation of the ITU-T G.722 Annex D coding algorithm. The electronic attachment contains ANSI-C source code, which is an integral part of Annex E. History Edition Recomm
10、endation Approval Study Group Unique ID* 1.0 ITU-T G.722 1987-02-28 XVIII 11.1002/1000/10943 2.0 ITU-T G.722 1988-11-25 11.1002/1000/919 2.1 ITU-T G.722 (1988) App. II 1988-11-25 11.1002/1000/3609 2.2 ITU-T G.722 (1988) Annex A 1993-03-12 XV 11.1002/1000/920 2.3 ITU-T G.722 (1988) App. III 2006-11-2
11、4 16 11.1002/1000/9052 2.4 ITU-T G.722 (1988) App. IV 2006-11-24 16 11.1002/1000/9053 2.5 ITU-T G.722 (1988) App. IV 2007-07-06 16 11.1002/1000/9212 2.6 ITU-T G.722 (1988) App. IV 2009-11-06 16 11.1002/1000/10654 2.7 ITU-T G.722 (1988) Amd. 1 2010-11-13 16 11.1002/1000/10983 2.8 ITU-T G.722 (1988) A
12、md. 2 2011-03-25 16 11.1002/1000/11331 3.0 ITU-T G.722 2012-09-13 16 11.1002/1000/11673 3.1 ITU-T G.722 (2012) Amd. 1 2014-10-14 16 11.1002/1000/12232 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique
13、 ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.722 (2012)/Amd.1 (10/2014) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Te
14、lecommunication 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 worldwide basis. The World Telecommunication Standardizatio
15、n 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 in WTSA Resolution 1. In some areas of information technolo
16、gy 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 administration and a recognized operating agency. Compliance
17、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 provisions are met. The words “shall“ or some other obligato
18、ry 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 RIGHTSITU draws attention to the possibility that the practice or implementation of
19、 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 outside of the Recommendation development process. As of the
20、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 latest information and are therefore strongly urged to consult
21、the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 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.722 (2012)/Amd.1 (10/2014) 1 Recommendation ITU-T G.722 7 kHz audio-coding within 6
22、4 kbit/s Amendment 11 New Annex E An alternative implementation of stereo super-wideband extension using floating point Annex E Floating-point implementation of ITU-T G.722 Annex D (This annex forms an integral part of this Recommendation.) E.1 Algorithmic description This floating-point version of
23、ITU-T G.722 Annex D has the same algorithm steps as the fixed-point version. Similarly, the bitstream is identical to that of ITU-T G.722 Annex D. For algorithmic details, see the main body of the Recommendation and Annex D. E.2 ANSI C code ANSI C source code, simulating the floating-point version o
24、f ITU-T G.722 Annex D defined in this annex, is available as an electronic attachment to Annex E. The current version of this ANSI C source code is Version 1.0 of September 2012. The structure of the floating-point source code is related to the corresponding fixed point source code. Tables E.1 to E.
25、3 give the list of the software files names with a brief description. Note that files related to basic operators or mathematical operations are not used for floating-point arithmetic. A set of floating point related routines have been added as floatutil.c. Table E.1 Summary of encoder specific routi
26、nes Filename Description encoder.c ITU-T G.722-stereo encoder interface routine g722_stereo_enc.c ITU-T G.722-stereo main encoder get_interchannel_difference.c Routines for whole wideband inter-channel differences (IPD, ITD and IC) estimation _ 1 Electronic attachment: SWBS-Float ANSI-C Source code
27、for ITU-T G.722 (2012) Amendment 1 2 Rec. ITU-T G.722 (2012)/Amd.1 (10/2014) Table E.2 Summary of decoder specific routines Filename Description decoder.c ITU-T G.722-stereo decoder interface routine g722_stereo_dec.c ITU-T G.722-stereo main decoder Table E.3 Summary of common routines Filename Desc
28、ription fft.c FFT routine stereo_tools.c Routines for read/write stereo bitstream and phase calculation table_stereo.c Tables for stereo encoder and decoder Printed in Switzerland Geneva, 2015 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principl
29、es Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital netwo
30、rk Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and n
31、etwork maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Tel
32、egraph 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
