视频会议最初的形态可以看作电视和电话会议的结合,通过电视和电话在两个或多个地点的用户之间举行会议,实现传送声音和图像。随着技术的发展,多点控制单元(Multipoint Control Unit,MCU)是多点视频会议系统的关键设备,它将来自各会议...视频会议最初的形态可以看作电视和电话会议的结合,通过电视和电话在两个或多个地点的用户之间举行会议,实现传送声音和图像。随着技术的发展,多点控制单元(Multipoint Control Unit,MCU)是多点视频会议系统的关键设备,它将来自各会议场点的信息流,经过同步分离后,抽取音频、视频、数据等信息和信令,再将这些信息和信令送入同一种处理模块,完成相应的音频混合或切换,视频混合或切换,数据广播和路由选择,定时和会议控制等过程,最后将各会议场点所需的各种信息重新组合起来,送往各相应的终端系统设备。展开更多
随着计算机技术和通信技术的快速发展,视频会议作为新的媒体工具,在通信舞台上锋芒毕露,尤其是在美国“9.11”事件和让人胆战心惊的“非典”之后,人们似乎一夜之间惊醒:原来召开视频会议是如此便捷。视频会议系统中的核心部分——多点...随着计算机技术和通信技术的快速发展,视频会议作为新的媒体工具,在通信舞台上锋芒毕露,尤其是在美国“9.11”事件和让人胆战心惊的“非典”之后,人们似乎一夜之间惊醒:原来召开视频会议是如此便捷。视频会议系统中的核心部分——多点控制单元(MCU:Multipoint Control Unit)也日益受到人们的关注。展开更多
In this paper, the characterization of single event multiple cell upsets(MCUs) in a custom SRAM is performed in a 65 nm triple-well CMOS technology, and O(linear energy transfer(LET) = 3.1 Me V cm2/mg), Ti(LET = 22.2 ...In this paper, the characterization of single event multiple cell upsets(MCUs) in a custom SRAM is performed in a 65 nm triple-well CMOS technology, and O(linear energy transfer(LET) = 3.1 Me V cm2/mg), Ti(LET = 22.2 Me V cm2/mg) and Ge(LET = 37.4 Me V cm2/mg) particles are employed. The experimental results show that the percentage of MCU events in total upset events is 71.11%, 83.47% and 85.53% at O, Ti and Ge exposures. Moreover, due to the vertical well isolation layout, 100%(O), 100%(Ti) and 98.11%(Ge) MCU cluster just present at one or two adjacent columns, but there are still 4 cell upsets in one MCU cluster appearing on the same word wire. The characterization indicates that MCUs have become the main source of soft errors in SRAM, and even though combining the storage array interleaving distance(ID) scheme with the error detection and correction(EDAC) technique, the MCUs cannot be completely eliminated, new radiation hardened by design techniques still need to be further studied.展开更多
文摘视频会议最初的形态可以看作电视和电话会议的结合,通过电视和电话在两个或多个地点的用户之间举行会议,实现传送声音和图像。随着技术的发展,多点控制单元(Multipoint Control Unit,MCU)是多点视频会议系统的关键设备,它将来自各会议场点的信息流,经过同步分离后,抽取音频、视频、数据等信息和信令,再将这些信息和信令送入同一种处理模块,完成相应的音频混合或切换,视频混合或切换,数据广播和路由选择,定时和会议控制等过程,最后将各会议场点所需的各种信息重新组合起来,送往各相应的终端系统设备。
文摘随着计算机技术和通信技术的快速发展,视频会议作为新的媒体工具,在通信舞台上锋芒毕露,尤其是在美国“9.11”事件和让人胆战心惊的“非典”之后,人们似乎一夜之间惊醒:原来召开视频会议是如此便捷。视频会议系统中的核心部分——多点控制单元(MCU:Multipoint Control Unit)也日益受到人们的关注。
基金supported by the National Natural Science Foundation of China(Grant No.61504169)the Preliminary Research Program of National University of Defense Technology of China(Grant No.0100066314001)
文摘In this paper, the characterization of single event multiple cell upsets(MCUs) in a custom SRAM is performed in a 65 nm triple-well CMOS technology, and O(linear energy transfer(LET) = 3.1 Me V cm2/mg), Ti(LET = 22.2 Me V cm2/mg) and Ge(LET = 37.4 Me V cm2/mg) particles are employed. The experimental results show that the percentage of MCU events in total upset events is 71.11%, 83.47% and 85.53% at O, Ti and Ge exposures. Moreover, due to the vertical well isolation layout, 100%(O), 100%(Ti) and 98.11%(Ge) MCU cluster just present at one or two adjacent columns, but there are still 4 cell upsets in one MCU cluster appearing on the same word wire. The characterization indicates that MCUs have become the main source of soft errors in SRAM, and even though combining the storage array interleaving distance(ID) scheme with the error detection and correction(EDAC) technique, the MCUs cannot be completely eliminated, new radiation hardened by design techniques still need to be further studied.
