基于汇编语言的DSP源代码优化技术的研究

介绍了一种利用汇编语言 ,借助流水线技术优化 TMS3 2 0 C60 0 0源代码的方法。该方法能够提高代码的执行效率 ,为实际工程中复杂算法的实时性提供了软件保障。以图像的测量跟踪程序为例 ,介绍了使用汇编语言 ,利用流水线结构优化源代码的方法和步骤 ,在实验中得出三个程序优化前和优化后的执行时间情况对比。窗口尺寸为 1 0 0× 80的重心跟踪程序优化前所用时间为 1 640μs,优化后所用时间为 48μs,执行时间缩短了 3 4.2倍 ,充分验证了汇编语言和流水线技术对 TMS3 2 0 C60 0 0源代码的优化效果 ,为实时条件下应用更为复杂和有效的算法开辟了广阔的空间     

激光电源中DSP数字控制技术的研究

介绍了DSP(DigitalSignalProcessor数字信号处理器 )在激光电源数字控制中的应用 ,针对连续固体激光器电源的特性与要求提出了以TI公司 2 4××系列芯片TMS32 0LF2 40 7为核心的数字PID控制系统的实现方案 ,并给出了相应的仿真结果     

用TMS320C25实现图像的(8×8)离散余弦变换

本文研究了图像的(8×8)像素DCT快速实现的基本方法,分析了直接(8×8)2D DCT和8点l-D DCT实现(8×8)2-D DCT的两步算法的两种矩阵分解模型,并对这两种实现方法进行了比较。在比较的基础上选用两步快速算法实现图像DCT。在硬件实现中,研究了DSP芯片TMS320C25的特点,提出了软件设计的准则和技巧,确定了硬件配置。通过上机与实验测试,取得的结果是:使用一片TMS320C25,64k DRAM,1/2~8精度,256×256×8 bit图像进行DCT时间约为206ms。     

基于DSP实现舰船目标检测与跟踪

DSP作为数字信号处理平台,随性能的不断提高其应用越来越广泛。TI公司的C64XX系列,主频达到1.1 GHz,处理速度达到9 000 MIPS。基于单片C6416的DSP处理系统可以实现导航雷达中目标杂波的恒虚警处理、目标量化检测与跟踪,充分结合DSP的特点,采用DSP/BIOS实时内核,根据功能的不同采用硬件中断、软件中断和任务的方式实现功能的分配和调度,可以在24 n mile的覆盖范围内,每周4 096个方位。A/D采集点距离分辨率3 m的条件下,检测和跟踪200个目标,跟踪算法选用α-β滤波算法。     

信息与动态

TFT LCD 5～ 8代线情况公　司代基板尺寸 (mm)万张 /月地点生产日期 (年 月 )夏　普 6.0 1 5 0 0× 1 80 0 1 .5龟山 2 0 0 4 16.0 1 5 0 0× 1 80 0 1 .5 2 0 0 4 78.0 2 2 0 0× 2 60 0 2 0 0 5 9LG Philips 5 .0 1 0 0 0× 1 2 0 0 6.0龟尾 2 0 0 2 55 .0 1 1 0 0× 1 2 5 0 6.0龟尾 2 0 0 3 36.0 1 5 0 0× 1 85 0 6.0龟尾 2 0 0 4 1 27.0 2 1 5 0× 2 2 5 0 6.0Paju 2 0 0 6 3Samsung 5 .0 1 1 0 0× 1 2 5 0 1 0天安 2 0 0 2 95 .0 1 1 0 0× 1 30 0 6.0 2 0 0 3 1 27.0 1 870× 2 2 0 0 6.0 2 0 0 5年初8.0 2 2 0 0× 2 4…     

TMS320C3×DSP的软件开发调测及程序优化

文章描述了TMS32 0C3×系列DSP的软件开发与调试环境及开发过程 ,分析了用C语言和汇编语言编程的优缺点及应用场合 ,介绍了一些编程技巧 ,以实现TMS32 0C3×高效编程     

红外弱小目标实时检测跟踪系统

根据红外弱小目标检测和跟踪的实时性要求,基于中波红外热像仪、双数字信号处理 器(DSP) 、管理板卡HEPC9,双DSPC6201和双现场可编程阵列( FPGA)搭建了一套实时的红外图像处理系统。同时针对C6201微处理器,成功实现了弱小目标检测与跟踪程序的优化和移植。系统测试表明:该系统实时和有效检测跟踪每秒50帧,每帧320 ×240,每像素14位的低信噪比复杂序列图像。     

基于DSP+FPGA框架的实时目标跟踪系统设计

随着我国武器研制水平的不断提高,高速度、高机动能力的武器装备越来越多,为了使型号武器中的目标跟踪器对于目标大尺度变化、速度快等情况有很好的鲁棒性,本文设计了一款基于DSP+FPGA的实时目标跟踪系统。针对均值漂移算法不适用于快速运动目标等限制情况使用多级金字塔进行了改进,采用背景加权的核直方图建立目标模板从而减小跟踪框中背景对于跟踪的影响,并将整个算法进行了优化以在嵌入式系统上实时实现。实验结果表明,本文设计的实时目标跟踪系统对于目标的快速运动、尺度变化以及一定程度的模糊均有很好的跟踪结果。每帧的平均处理时间为13.5ms,满足实际工程的实时性和稳定性要求。     

一种红外海面小目标检测算法的ASIC结构实现

文章基于一种用于红外图像小目标检测的多级滤波算法,提出其硬件实现结构。该结构选用统一的1×3模板,通过改变滤波器的级连数目得到不同大小的滤波模板,从而检测不同大小的小目标。数据路径包含三个并行的数据通道,采用流水线形式对数据进行处理,分别检测1×1～1×3、1×4～1×5和1×6～1×7的目标。这种结构可以对输入的红外图像进行实时处理。     

基才Stratix Ⅱ EP2S60的改进中值滤波器的设计及实现

在红外搜索跟踪系统中,为了有效可靠地对目标进行探测、跟踪,必须对红外图像进行滤波预处理,从而提高图像信号的信噪比.为满足实时红外图像预处理时对速度的高要求,采用了一种利于硬件实现的中值滤波改进算法,以Altera公司的Stratix Ⅱ系列EP2S60型FPGA为平台,成功实现了对256×320×16 bit图像的中值滤波,整个电路去噪效果明显,速度满足要求.     

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.     

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.     

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.     

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.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.