1、 International Telecommunication Union ITU-T G.722.2TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 2(01/2007) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Coding of analogue signals by methods other than PCM Wideband coding of speech
2、 at around 16 kbit/s using Adaptive Multi-Rate Wideband (AMR-WB) Corrigendum 2 ITU-T Recommendation G.722.2 (2003) Corrigendum 2ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERIST
3、ICS 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 OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC
4、 LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of analogue signals by pulse code modulation G.710G.719 Coding of analogue signals by methods other than PCM G
5、720G.729 Principal 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
6、 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 NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE
7、SYSTEM G.900G.999 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 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please re
8、fer to the list of ITU-T Recommendations. ITU-T Rec. G.722.2 (2003)/Cor.2 (01/2007) i ITU-T Recommendation G.722.2 Wideband coding of speech at around 16 kbit/s using Adaptive Multi- Rate Wideband (AMR-WB) Corrigendum 2 Summary Corrigendum 2 details a number of corrections needed to the C source cod
9、e in G.722.2 Annex C. These changes are due to an error in the ITU output interface and are necessary to maintain the synchronization with the 3GPP AMR-WB codec specifications. Source Corrigendum 2 to ITU-T Recommendation G.722.2 (2003) was approved on 13 January 2007 by ITU-T Study Group 16 (2005-2
10、008) under the ITU-T Recommendation A.8 procedure. ITU-T Rec. G.722.2 (2003)/Cor.2 (01/2007) ii FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanen
11、t 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 Standardization Assembly (WTSA), which meets every four years, establishes
12、 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 technology which fall within ITU-Ts purview, the necessary standards
13、 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 with this Recommendation is voluntary. However, the Recommen
14、dation 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 obligatory language such as “must“ and the negative equivalents are us
15、ed 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 attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intelle
16、ctual 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 date of approval of this Recommendation, ITU had received not
17、ice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2007 All rights reserved. No par
18、t of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.722.2 (2003)/Cor.2 (01/2007) iii CONTENTS Page 1 Annex C (electronic attachment) file bits.c 1 2 Annex C (electronic attachment) file dec_main.c 3 ITU-T Rec. G.722.2 (2003)/Cor
19、2 (01/2007) 1 ITU-T Recommendation G.722.2 Wideband coding of speech at around 16 kbit/s using Adaptive Multi- Rate Wideband (AMR-WB) Corrigendum 2 1 Annex C (electronic attachment) file bits.c Lines 319-371 Software listing before the change: if(n = 2) if(datalen = 0) /* RX_NO_DATA frame type */ i
20、f(st-prev_ft = RX_SPEECH_GOOD | st-prev_ft = RX_SPEECH_BAD) *frame_type = RX_SID_FIRST; else *frame_type = RX_NO_DATA; *mode = st-prev_mode; else coding_mode = -1; for(i=NUM_OF_MODES-1; i=0; i-) if(datalen = nb_of_bitsi) coding_mode = i; if(coding_mode = -1) fprintf(stderr, “nn ERROR: Invalid number
21、 of data bits received %dnn“, datalen); exit(-1); if(coding_mode = NUM_OF_MODES-1) /* DTX frame type */ if(type_of_frame_type = 0x6b20) /* bad SID frame */ *frame_type = RX_SID_BAD; else /* correct SID frame */ *frame_type = RX_SID_UPDATE; *mode = st-prev_mode; else if(type_of_frame_type = 0x6b20) I
22、TU-T Rec. G.722.2 (2003)/Cor.2 (01/2007) 2 *frame_type = RX_SPEECH_BAD; else *frame_type = RX_SPEECH_GOOD; *mode = coding_mode; Software listing after the change: if(n = 2) if(type_of_frame_type = 0x6b20) /* bad frame */ *frame_type = RX_SPEECH_LOST; *mode = st-prev_mode; else if(type_of_frame_type
23、 0x6b21) /* good frame */ if(datalen = 0) /* RX_NO_DATA frame type */ if(st-prev_ft = RX_SPEECH_GOOD) *frame_type = RX_SID_FIRST; else *frame_type = RX_NO_DATA; *mode = st-prev_mode; else coding_mode = -1; for(i=NUM_OF_MODES-1; i=0; i-) if(datalen = nb_of_bitsi) coding_mode = i; if(coding_mode = -1
24、) fprintf(stderr, “nn ERROR: Invalid number of data bits received %dnn“, datalen); exit(-1); if(coding_mode = NUM_OF_MODES-1) /* DTX frame type */ *frame_type = RX_SID_UPDATE; *mode = st-prev_mode; else *frame_type = RX_SPEECH_GOOD; *mode = coding_mode; ITU-T Rec. G.722.2 (2003)/Cor.2 (01/2007) 3 st
25、prev_mode = *mode; st-prev_ft = *frame_type; else fprintf(stderr, “nn ERROR: Invalid ITU file format nn“); exit(-1); 2 Annex C (electronic attachment) file dec_main.c Lines 244-261 Software listing before the change: /* SPEECH action state machine */ test();test(); if (sub(frame_type, RX_SPEECH_BAD
26、) = 0) | (sub(frame_type, RX_SPEECH_PROBABLY_DEGRADED) = 0) /* bfi for all index, bits are not usable */ bfi = 1; move16(); unusable_frame = 0; move16(); else if (sub(frame_type, RX_NO_DATA) = 0) | (sub(frame_type, RX_SPEECH_LOST) = 0) /* bfi only for lsf, gains and pitch period */ bfi = 1; move16()
27、 unusable_frame = 1; move16(); else bfi = 0; move16(); unusable_frame = 0; move16(); Software listing after the change: /* SPEECH action state machine */ test();test(); if (sub(frame_type, RX_SPEECH_BAD) = 0) | (sub(frame_type, RX_SPEECH_PROBABLY_DEGRADED) = 0) /* bfi only for lsf, gains and pitch
28、period */ bfi = 1; move16(); unusable_frame = 0; move16(); else if (sub(frame_type, RX_NO_DATA) = 0) | (sub(frame_type, RX_SPEECH_LOST) = 0) /* bfi for all index, bits are not usable */ bfi = 1; move16(); unusable_frame = 1; move16(); else bfi = 0; move16(); unusable_frame = 0; move16(); SERIES OF I
29、TU-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 Transmission systems and media, digital systems and
30、 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 signalsSeries K Protection against interference Series L Construction, installation and protection of cables
31、 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 equipment Series P Telephone transmission quality, telephone
32、 installations, local line networks 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
