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ITU-T G.729.1 (2006) Amd. 4 (06/2008)
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ITU-T G.729.1 (2006) Amd. 4 (06/2008)
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新附件C(DTX/CNG方案)及对正文和附件B的更正
本建议书描述了一个可与 G.729、G.729A和G.729B互操作的8-32 kbit/s可分级宽带语音和音频编解码算法。G.729EV 编解码器输出信号在8 kbit/s和12 kbit/s 采样频率上带宽为50-4000 Hz,在14-32 kbit/s采样频率上带宽为50-7000 Hz。在8 kbit/s,G.729EV可以与G.729、G.729附件A和G.729附件B实现完全互操作。因此可预见在现有基于G.729的VoIP基础设施中将得到有效的部署。编解码器工作于20 ms帧,算法时延为48.9375 ms。默认情况下,编码器输入和解码器输出信号采样频率为16 kHz。编码器生成一个嵌入式码流,它分为12层结构,分别对应于8-32 kbit/s内12个可用比特率。在解码器端或通信系统任一组成部分都可以将码流截断,从而无需带外信令便可以将比特速率“实时”调整至理想值。基本算法基于三阶段编码结构:低频带(50-4000 Hz)嵌入式码激励线性估计(CELP)编解码,高频带(4000-7000 Hz)时域带宽扩展(TDBWE)参量编解码,以及通过被称为时域混叠消除(TDAC)的估计变换编解码技术实现的全频带(50-7000Hz)增强功能。修订1介绍了新附件A,其中包含RTP有效载荷格式、功能标识符以及使用H.245的ITU-T G.729.1功能信令参量。格式和功能参量都完全兼容于相应的G.729.1 RTP定义,从而允许实现无缝互操作。除了新附件外,ITU-T G.729.1修订1还包含了改正ITU-T G.729.1缺陷所做的必需变动,并提供了新的更全面的测试向量。修订2介绍了新附件B,其中定义了一个用于在浮点运算优化硬件上以浮点运算实施G.729.1算法的备选方案。文件附带的浮点C代码可与定点C代码实现完全互操作。修正3将正文的低延迟功能延伸,并将附件B扩展至第一宽带比特率(14 kbit/s)。此外,它还包括更正G.729.1正文及附件B案文和C代码编码缺陷所需的变更。修正4引入了新的附件,规范了不连续传输(DTX)以及G.729.1中的舒适噪声生成。通过此附件,G.729.1编码器能够在每次周边背景噪声参数更新时生成一个静音插入说明(SID),该更新的目的是保持所生成背景噪声的质量。SID信息包括可由附件B/G.729所述解码器解码的核心较低频段层,一个改进型较低频段层和一个较高频段层。在不活跃部分,SID更新传输失败和SID尺寸较小,将大幅降低带宽。除此附件外,修正4纳入了须针对更正G.729.1 C源代码(正文和附件B)所确定缺陷实施的变革,提出了一系列修订后的测试矢量,并更新了G.729.1表格中复杂的数据。
Citation:
https://handle.itu.int/11.1002/1000/9520
Series title:
G series: Transmission systems and media, digital systems and networks
G.700-G.799: Digital terminal equipments
G.710-G.729: Coding of voice and audio signals
Approval date:
2008-06-29
Provisional name:
G.729EV
Approval process:
AAP
Status:
In force
Observation:
See G.729.1 (2006) Corrigendum 1 (2009) for the latest version of the ANSI C code for this item
Maintenance responsibility:
ITU-T Study Group 16
Further details:
Patent statement(s)
Development history
Associated test signals
Editions
Related Supplement(s)
Related technical papers and reports
Ed.
ITU-T Recommendation
Status
Summary
Table of Contents
Download
1.9
G.729.1 (2006) Amd. 8 (03/2013)
In force
here
-
here
1.8
G.729.1 (2006) Amd. 7 (02/2012)
In force
here
here
here
1.7
G.729.1 (2006) Amd. 6 (03/2010)
In force
here
here
here
1.6
G.729.1 (2006) Cor. 1 (08/2009)
In force
here
here
here
1.5
G.729.1 (2006) Amd. 5 (12/2008)
In force
here
here
here
1.4
G.729.1 (2006) Amd. 4 (06/2008)
In force
here
here
here
1.3
G.729.1 (2006) Amd. 3 (08/2007)
In force
here
here
here
1.2
G.729.1 (2006) Amd. 2 (02/2007)
In force
here
here
here
1.1
G.729.1 (2006) Amd. 1 (01/2007)
In force
here
here
here
1
G.729.1 (05/2006)
In force
here
here
here
ITU-T Supplement
Title
Status
Summary
Table of contents
Download
G Suppl. 4 (12/1972)
Certain methods of avoiding the transmission of excessive noise between interconnected systems
In force
-
-
here
G Suppl. 5 (10/1984)
Measurement of the load of telephone circuits under field conditions
In force
-
-
here
G Suppl. 7 (12/1972)
Loss-frequency response of channel-translating equipment used in some countries for international circuits
In force
here
here
here
G Suppl. 8 (12/1972)
Method proposed by the Belgian telephone administration for interconnection between coaxial and symmetric pair systems
In force
-
-
here
G Suppl. 17 (10/1984)
Group-delay distortion performance of terminal equipment
In force
-
-
here
G Suppl. 19 (10/1984)
Digital crosstalk measurement (method used by the Administrations of France, the Netherlands and Spain)
In force
-
-
here
G Suppl. 22 (10/1984)
Mathematical models of multiplex signals
In force
-
-
here
G Suppl. 26 (10/1984)
Estimating the signal load margin of FDM wideband amplifier equipment and transmission systems
In force
-
-
here
G Suppl. 27 (10/1984)
Interference from external sources
In force
-
-
here
G Suppl. 28 (10/1984)
Application of transmultiplexers, FDM codecs, data-in-voice (DIV) systems and data-over-voice (DOV) systems during the transition from an analogue to a digital network
In force
-
-
here
G Suppl. 32 (11/1988)
Transfer of alarm information on 60-channel transmultiplexing equipment
In force
-
-
here
G Suppl. 34 (11/1988)
Temperature in underground containers for the installation of repeaters
In force
-
-
here
G Suppl. 35 (11/1988)
Guidelines concerning the measurement of wander
In force
-
-
here
G Suppl. 36 (11/1988)
Jitter and wander accumulation in digital networks
In force
-
-
here
G Suppl. 39 (02/2016)
Optical system design and engineering considerations
In force
here
here
here
G Suppl. 40 (10/2018)
Optical fibre and cable Recommendations and standards guideline
In force
here
here
here
G Suppl. 41 (02/2018)
Design guidelines for optical fibre submarine cable systems
In force
here
here
here
G Suppl. 42 (10/2018)
Guide on the use of the ITU-T Recommendations related to optical fibres and systems technology
In force
here
here
here
G Suppl. 43 (02/2011)
Transport of IEEE 10GBASE-R in optical transport networks (OTN)
In force
here
here
here
G Suppl. 44 (06/2007)
Test plan to verify B-PON interoperability
In force
here
here
here
G Suppl. 45 (09/2022)
Power conservation in optical access systems
In force
here
here
here
G Suppl. 46 (05/2009)
G-PON interoperability test plan between optical line terminations and optical network units
In force
here
here
here
G Suppl. 47 (09/2012)
General aspects of optical fibres and cables
In force
here
here
here
G Suppl. 48 (06/2010)
10-Gigabit-capable passive optical networks: Interface between media access control with serializer/deserializer and physical medium dependent sublayers
In force
here
here
here
G Suppl. 49 (09/2020)
Rogue optical network unit (ONU) considerations
In force
here
here
here
G Suppl. 50 (09/2011)
Overview of digital subscriber line Recommendations
In force
here
here
here
G Suppl. 51 (06/2017)
Passive optical network protection considerations
In force
here
here
here
G Suppl. 52 (09/2012)
Ethernet ring protection switching
In force
here
here
here
G Suppl. 53 (12/2014)
Guidance for Ethernet OAM performance monitoring
In force
here
here
here
G Suppl. 54 (07/2015)
Ethernet linear protection switching
In force
here
here
here
G Suppl. 55 (12/2023)
Radio-over-fibre (RoF) technologies and their applications
In force
here
here
here
G Suppl. 56 (02/2016)
OTN transport of CPRI signals
In force
here
here
here
G Suppl. 57 (07/2015)
Smart home profiles for 6LoWPAN devices
In force
here
here
here
G Suppl. 58 (12/2023)
Optical transport network module framer interfaces
In force
here
here
here
G Suppl. 59 (02/2018)
Guidance on optical fibre and cable reliability
In force
here
here
here
G Suppl. 60 (09/2016)
Ethernet linear protection switching with dual node interconnection
In force
here
here
here
G Suppl. 62 (02/2018)
Gfast certification
In force
here
here
here
G Suppl. 64 (02/2018)
PON transmission technologies above 10 Gb/s per wavelength
In force
here
here
here
G Suppl. 65 (10/2018)
Simulations of transport of time over packet networks
In force
here
here
here
G Suppl. 66 (09/2020)
5G wireless fronthaul requirements in a passive optical network context
In force
here
here
here
G Suppl. 67 (07/2019)
Application of optical transport network Recommendations to 5G transport
In force
here
here
here
G Suppl. 68 (12/2023)
Synchronization operations, administration and maintenance requirements
In force
here
here
here
G Suppl. 69 (09/2020)
Migration of a pre-standard network to a metro transport network
In force
here
here
here
G Suppl. 70 (09/2020)
Supplement on sub 1 Gbit/s services transport over optical transport network
In force
here
here
here
G Suppl. 71 (12/2023)
Optical line termination capabilities for supporting cooperative dynamic bandwidth assignment
In force
here
here
here
G Suppl. 72 (04/2021)
Modelling consideration for optical media networks
In force
here
here
here
G Suppl. 73 (10/2021)
Influencing factors on quality of experience for multiview video (MVV) services
In force
here
here
here
G Suppl. 74 (12/2021)
Network slicing in a passive optical network context
In force
here
here
here
G Suppl. 75 (12/2021)
5G small cell backhaul/midhaul over TDM-PON
In force
here
here
here
G Suppl. 76 (12/2021)
Optical transport network security
In force
here
here
here
G Suppl. 77 (06/2022)
Supplement 77 to ITU-T G-series of Recommendations - Influencing factors on quality of experience (QoE) for video customized alerting tone (CAT) and video customized ringing signal (CRS) services
In force
here
here
here
G Suppl. 78 (09/2022)
Use case and requirements of fibre-to-the-room for small business applications
In force
here
here
here
G Suppl. 79 (12/2023)
Latency control and deterministic capability over a PON system
In force
here
here
here
Title
Approved on
Download
Roadmap for QoS and QoE in the ITU-T Study Group 12 context (TR-RQ)
2023
here
Considerations on the use of GNSS as a primary time reference in telecommunications
2020
here
Use of G.hn in industrial applications
2020
here
Practical procedures for subjective testing
2011
here
ISDN field trial guidelines
1991
here
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