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ITU-T G.729.1 (2006) Amd. 3 (08/2007)

G.729.1低延时模式功能向14 kbit/s的扩展，以及对正文和附件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ITU-T 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至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， G.729.1修订1还包含了改正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。

Citation:	https://handle.itu.int/11.1002/1000/9213
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:	2007-08-29
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

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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ITU-T Recommendations

ITU-T G.729.1 (2006) Amd. 3 (08/2007)