M11;M40 标准查询与下载

ITU-T P.862 CORR 1-2007 语音质量的感知评估(PESQ):语音质量的感知评估(PESQ):评估窄带电话网络和语音编解码器的端到端语音质量的客观方法.勘误表1.12号研究组[作废的:ITU-T P.861;ITU-T P.861]

ITU draws attention 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 outside of the Recommendation development process.

Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs Corrigendum 1 Study Group 12 [Superseded: ITU-T P.861 ITU-T P.861]

YD/T 1434-2006 软交换设备总体技术要求

本标准规定了软交换在网络中的位置、网络框架结构、功能、通信接口、协议及其性能和业务要求。 本标准适用于软交换设备的研制、开发、引进和验收。

General Technical Requirements for Softswitch Equipments

YD/T 1435-2006 软交换设备测试方法

本标准规定了软交换设备的通信接口、功能、协议、人性能、操作维护及网络管理、可靠性、协议、 供电以及环境测试等。 本标准适用于软交换设备。

Testing Methods for Softswitch Equipments

ITU-T E.470 FRENCH-2005 具有公用交换电话网.互联网协议.公用交换电话网(PSTN).互联网协议(IP).公用交换电话网(PSTN))架构的基于互联网协议(IP)的网络上的语音业务质量(QoS)的操作事项

It is recognized that IP-based networks are increasingly used to deliver voice services to customers. These networks can impact the end-to-end service quality perceived by users. In order to maintain network performance required to deliver the desired service quality, several operational issues have to be considered. These issues include defining network performance measuresand their objectives, interworking issues between networks employing a variety of technologies, network measurement points, information to be exchanged between network operators, etc.

Operational considerations for QoS of voice over IP-based networks with PSTN-IP-PSTN architecture

ITU-T E.470 SPANISH-2005 具有公用交换电话网.互联网协议.公用交换电话网(PSTN).互联网协议(IP).公用交换电话网(PSTN))架构的基于互联网协议(IP)的网络上的语音业务质量(QoS)的操作事项

It is recognized that IP-based networks are increasingly used to deliver voice services to customers. These networks can impact the end-to-end service quality perceived by users. In order to maintain network performance required to deliver the desired service quality, several operational issues have to be considered. These issues include defining network performance measuresand their objectives, interworking issues between networks employing a variety of technologies, network measurement points, information to be exchanged between network operators, etc.

Operational considerations for QoS of voice over IP-based networks with PSTN-IP-PSTN architecture

ITU-T P.862 SPANISH-2001 语音质量的感知评估(PESQ):语音质量的感知评估(PESQ):评估窄带电话网络和语音编解码器的端到端语音质量的客观方法.系列P:电话传输质量.电话设备.本地线路网络.评定质量的客观和主观方法.12号研究组

Based on the benchmark results presented within Study Group 12, an overview of the test factors, coding technologies and applications to which this Recommendation applies is given in Tables 1 to 3. Table 1 presents the relationships of test factors, coding technologies and applications for which this Recommendation has been found to show acceptable accuracy. Table 2presents a list of conditions for which the Recommendation is known to provide inaccurate predictions or is otherwise not intended to be used. Finally, Table 3 lists factors, technologies and applications for which PESQ has not currently been validated. Although correlations between objective and subjective scores in the benchmark were around 0.935 for both known and unknown data, the PESQ algorithm cannot be used to replace subjective testing.

Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs--SERIES P: TELEPHONE TRANSMISSION QUALITY TELEPHONE INSTALLATIONS LOCAL LINE NETWORKS Methods