编码器轴系晃动对测角精度影响分析

光电轴角编码器作为一种精密测角传感器,其测角精度受到多种因素的影响,其中轴系晃动是影响其精度的主要因素之一。为了研究编码器轴系晃动的规律,利用多种检测方法对轴系晃动进行检测,利用傅里叶谐波数学模型对测量结果进行分析,并结合编码器测角精度检测结果,发现测角精度与轴系晃动的低频谐波之间存在固定的函数关系,采用这种关系可以补偿编码器的测角误差。利用这种方法可以在编码器内部或在线的方式进行实时误差补偿,从而达到提高编码器测角精度的目的。这对相关仪器的测量精度的提高起到一定参考意义。     

水泥生产线高精度自动计数仪表的设计与实现

该文介绍了以MSP430F149单片机为核心的高精度水泥包自动计数器的研制,其通过双光电开关和旋转编码器等多种检测途径,解决水泥包的计数和显示问题,水泥包的数量可同时在仪表和外接高亮度LED大屏上显示。用户可根据需要,任意设定计数的初值和最大值以及选定单或双光电触发,以适应不同的工作场合。该仪表具有自动分辨连包和叠包功能。并另配有无线接口,用于较远距离传输信息。该仪表可解决各类软性包装物品的计数难题。     

钢丝绳生产过程控制系统的设计

介绍在钢丝绳合成生产过程中应用ＳＴＤ工业控制计算机设计的实例，该系统采用变频调速器实现电机的调速，省去了传统的机械传动机构，使得操作灵活方便，生产精度高，在不增加硬件设备的条件下可生产多种规格的产品．     

智能语言发令和报警系统的研制

本文介绍一种能自动用语言准确报出故障、发出指令的系统。该系统用UM5100语言处理器作语言波形编码器,直接用数字表示语言波形。借助于存储器和音频电路组成语言录放电路,进行语言的记录和再生,并在微机的控制下组成智能系统,应用于工业生产及智能测试等领域。当过程控制中出现不正常情况时,迅速、准确地为操作人员指出故障所在和发出操作指令。这种系统明显地优于以往的指示灯显示或者电铃呜响的报警方式,并且在工业生产、交通管理及医疗技术等各种领域中有广泛的通用性及实用价值。     

基于BER的ASN．1编解码原理与设计实现

本文介绍了ASN．1和BER基本编码规则，分析了7号信令协议栈的TCAP层消息结构和ASN．1之间的关系，详细介绍了应用于信令中继系统中的ASN．1编解码模块的设计和实现。     

Platform-Based MPEG-4 SOC Design for Video Communications

An MPEG-4 video coding SOC design is presented in this paper. We adopt platform-based architecture with an embedded RISC core and efficient memory organization. A motion estimator supporting predictive diamond search and spiral full search is implemented for compromise between compression performance and design cost. The proposed data reuse scheme reduces required memory access bandwidth. For texture coding path, an interleaving DCT/IDCT scheduling with substructure sharing technique is proposed. Several key modules are integrated into an efficient platform in hardware/software co-design fashion. The cost-efficient video encoder SOC consumes 256.8 mW at 40 MHz and achieves real-time encoding of 30 CIF (352×288) frames per second. Yung-Chi Chang was born in Kaohsiung, Taiwan, R.O.C., in 1975. He received the B.S. and M.S. degrees from the Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C., in 1998 and 2000, respectively, where he is currently pursuing the Ph.D. degree in the Graduate Institute of Electrical Engineering. His research interests include video coding algorithms and VLSI architectures for image/video processing. Wei-Min Chao was born in Taoyuan, Taiwan, R.O.C., in 1977. He received the B.S. and M.S. degrees from the Department of Electronics Engineering, National Taiwan University in 2000 and 2002 separately. His research interests include video coding algorithms and VLSI architecture for image and video processing. Chih-Wei Hsu was born in Taipei, Taiwan, in 1979. He received the B.S.E.E and M.S.E.E degrees from National Taiwan University (NTU), Taipei, in 2001 and 2003, respectively. He joined MediaTek, Inc., Hsinchu, Taiwan, in 2003, where he develops integrated circuits related to multimedia systems and optical storage devices. His research interests include object tracking, video coding, baseband signal processing, and VLSI design. Liang-Gee Chen was born in Yun-Lin, Taiwan, in 1956. He received the B.S., M.S., and Ph.D. degrees in electrical engineering from National Cheng Kung University, Tainan, Taiwan, in 1979, 1981, and 1986, respectively. He was an Instructor (1981-1986), and an Associate Professor (1986-1988) in the Department of Electrical Engineering, National Cheng Kung University. In the military service during 1987 to 1988, he was an Associate Professor in the Institute of Resource Management, Defense Management College. In 1988, he joined the Department of Electrical Engineering, National Taiwan University. During 1993 to 1994 he was a Visiting Consultant of DSP Research Department, AT & T Bell Lab, Murray Hill. In 1997, he was a visiting scholar of the Department of Electrical Engineering, University of Washington, Seattle. During 2001 to 2004, he was the first director of the Graduate Institute of Electronics Engineering (GIEE) in National Taiwan University (NTU). Currently, he is a Professor of the Department of Electrical Engineering and GIEE in NTU, Taipei, Taiwan. He is also the director of the Electronics Research and Service Organization in Industrial Technology Research Institute, Hsinchu, Taiwan. His current research interests are DSP architecture design, video processor design, and video coding systems. Dr. Chen has served as an Associate Editor of IEEE Transactions on Circuits and Systems for Video Technology since 1996, as Associate Editor of IEEE Transactions on VLSI Systems since 1999, and as Associate Editor of IEEE Transactions on Circuits and Systems II since 2000. He has been the Associate Editor of the Journal of Circuits, Systems, and Signal Processing since 1999, and a Guest Editor for the Journal of Video Signal Processing Systems. He is also the Associate Editor of the Proceedings of the IEEE. He was the General Chairman of the 7th VLSI Design/CAD Symposium in 1995 and of the 1999 IEEE Workshop on Signal Processing Systems: Design and Implementation. He is the Past-Chair of Taipei Chapter of IEEE Circuits and Systems (CAS) Society, and is a member of the IEEE CAS Technical Committee of VLSI Systems and Applications, the Technical Committee of Visual Signal Processing and Communications, and the IEEE Signal Processing Technical Committee of Design and Implementation of SP Systems. He is the Chair-Elect of the IEEE CAS Technical Committee on Multimedia Systems and Applications. During 2001--2002, he served as a Distinguished Lecturer of the IEEE CAS Society. He received the Best Paper Award from the R.O.C. Computer Society in 1990 and 1994. Annually from 1991 to 1999, he received Long-Term (Acer) Paper Awards. In 1992, he received the Best Paper Award of the 1992 Asia-Pacific Conference on circuits and systems in the VLSI design track. In 1993, he received the Annual Paper Award of the Chinese Engineer Society. In 1996 and 2000, he received the Outstanding Research Award from the National Science Council, and in 2000, the Dragon Excellence Award from Acer. He is a member of Phi Tan Phi.     

基于算法容错中的编码方法

论述了基于算法容错技术的基本思想以及用于该容错技术的线性码的结构，并分析了加权校验和容方案在实际计算系统中的性能，同指出了目前有待进一步研究的几个问题。     

原子发射光谱法测定钢中微量硅的研究

利用光电直读光谱仪探讨了钢中微量硅的发射光谱分析方法，选择Ｓｉ２８８１．５Ａ作为分析线，Ｆｅ２７１４．４Ａ作为内标线，对钢中硅测定的线性范围为０．０５％～１．３％，对Ｓｉ含量为０．１７％的标准钢样的１２次平行测定，相对标准偏差为５．３％，并对标准钢样进行了测定，与理论值相符，本法用于实际样品分析，结果令人满意。     

CCD光电尺寸检测装置的分析与设计

本文介绍了CCD光电尺寸检测装置的原理,分析了光学系统中各部分的形式结构,设计了一套适合数字信号处理的单片机应用系统。并对通过实验得到的一些结论给予了详细的理论分析。最后就影响系统工作精度的几种主要误差进行了讨论。     

The Development and Application of a Planar Encoder Measuring System for Performance Tests of CNC Machine Tools

In this paper, a measuring device with a planar encoder is developed to test the performance of a CNC machine tool. With the assistance of a PC, this system can be employed for both 2D contouring tests and 3D positioning tests for a CNC machine tool. The structure and the principle of the system, the applications for the general 2D contouring test, the drift test, and the specified geometric part path tests. An actual case study on improving the accuracy of machining a cam are described. Finally, a new 3D positioning method using the optic encoder is demonstrated. ID="A1"Correspondance and offprint requests to: Dr W. Jwye, 64 Wenhua Road, National Huwei Institute of Technology, Huwei, Yunlin, Taiwan 632. E-mail: Jywe@sunws.nhit.edu.tw