基于光纤的LED显示屏实时数字视频传输系统的设计

给出了一种应用于LED显示屏远程实时数字视频传输系统的设计方案.将PC端DVI接口输出的视频信号,转换为适合远距离传输的以太网帧格式,在接收端进行帧解码和信号还原,并将接收模块与控制模块集成在一块电路板上,实现了输入端分辨率和刷新率的灵活设置.使用千兆以太网集线器并通过RJ45接口实现了接收控制板的板级级联,免去了数据接收转发的功能模块,减少了设计复杂度.为满足实际远距离传输的需求,打破了千兆以太网5类非屏蔽双绞线最长100 m传输距离的限制,设计了一种以太网光纤转换模块,用单模光纤取代5类非屏蔽双绞线传输信号,最远传输距离达到 10 km.     

行间转移型面阵CCD成像系统设计

采用行间转移型面阵CCD KAI-1020作为图像传感器,以现场可编程门阵列（FPGA）为核心控制器,设计并实现了一个完整的成像系统。FPGA产生驱动时序、控制CCD上电顺序、调节曝光时间,并实现数据缓存。CCD模拟视频信号经过预处理,通过同轴电缆传输到CCD专用视频处理器进行相关双采样和模数转换,以10位像素深度输出到FPGA,数字视频信号经过差分芯片驱动以低压差分信号（LVDS）格式输出到数据采集卡。集成化视频处理电路提高了系统的信噪比,改善了成像质量。实验表明,CCD成像系统工作稳定可靠,像素读出时钟为10 MHz时,帧频为10帧/s。设计的CCD成像系统性能好、可靠性高、实现周期短,具有很强的可扩展性。     

基于FPGA的VGA-DVI视频转换器设计

提出了一种基于FPGA实现12C总线接口来控制芯片ISL98003和芯片SIll64完成VGA-DVI视频转换的设计方案。对输入的VGA模拟视频信号经过两次转换,输出符合TMDS协议的DVI数字视频信号。同时通过FPGA~部设计实现了对视频转换模式选择的可视化操。     

一种延长DVI高清视频信号传输距离的方法

针对DVI高清视频传输距离短的问题,提出了一种利用千兆以太网物理层协议进行点对点低延时传输的方法。该方法通过对DVI视频的采集,并通过一种改进的低复杂度压缩算法,压缩后的数据利用千兆以太网底层协议的ARP包承载数据传输,从而实现实时点对点传输。用此方法可使高清DVI信号延长传输到100 m以上,满足了工程中对高清视频远程实时监控的要求。     

高清视频系统的传输问题

在高清系统设计中除了要考虑各种信号的兼容性．还要考虑信号的传输距离和采用的传输线缆。在现今视频系统发展从模拟视频向数字视频过渡,从标清向高清过渡的时期中．各种视频源设备和各种视频显示设备采用了不同的编码技术和接口方式,因此在高清视频系统设计中必须详细了解各种视频信号的传输距离、编解码方式,否则视频信号将无法兼容和显示。     

模拟视频； NTSC； Xscale处理器； CH7005； WinCE操作系统；

介绍了一种嵌入式平台上采用的模拟视频模块。该嵌入式平台基于IntelXscale处理器和MicrosoftWinCE操作系统。显示模块使用CH7005TVEncoder实现数字视频信号到模拟视频信号的转换,输出NTSC制式标准电视信号。本文介绍了模拟视频模块的硬件框架和基本硬件设计,并详细描述了模拟视频转换模块的软件实现以及性能优化措施。测试结果表明,模拟视频模块输出信号的信噪比达到了国家标准要求。     

一种嵌入式平台上模拟视频模块的设计与实现

介绍了一种嵌入式平台上采用的模拟视频模块。该嵌人式平台基于Intel Xscale处理器和Microsoft WinCE操作系统。显示模块使用CH7005 TV Encoder实现数字视频信号到模拟视频信号的转换,输出NTSC制式标准电视信号。本文介绍了模拟视频模块的硬件框架和基本硬件设计,并详细描述了模拟视频转换模块的软件实现以及性能优化措施。测试结果表明,模拟视频模块输出信号的信噪比达到了国家标准要求。     

超市防盗多路视频监控系统的设计

介绍了一种超市防盗用10路视频监控系统的设计,该系统通过安装在收银台的摄像机进行数字视频信号的采集,根据传感器信号的情况,通过切换控制器将视频信号送入视频采集卡,进行实时视频处理,当有异常情况发生时及时发出报警信号.     

IP网络摄像机

1 IP网络摄像机的定义。IP网络摄像机(IP Network Canmera／Web Camera)实际上就是具有网络接入功能的摄像机，它内建Web Server和CCD图像传感器，内部增加了对模拟视频进行数字化处理的DSP芯片，可以将数字视频信号转成符合网络传输协议的数据流，送到网上传输，远端的浏览者只要用标准的网络浏览器即可实时观看该影像。     

PAL一体化摄像机设计

基于ICX229AK CCD芯片组设计了具有VGA接口的一体化摄像机.采用DSP+FPGA+ASIC的构架,完成了视频信号的采集和多格式显示.在FPGA中实现了自动聚焦、自动光圈等功能,并扩展了鼠标驱动及划线、OSD显示等实用功能.通过PW 1226滤波放大处理,完成了PAL制数字视频信号到VGA格式的转换,分辨率可达到1024×768,.实现了复合视频,S-VIDEO和VGA 3种视频信号的同时输出.该一体化摄像机可用于视频展台及实时监控等方面,大大提高了输出图像质童.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks