扬声器音质测试系统的设计

针对目前扬声器音质测试系统存在的功能、价格等方面的问题,设计了一种扬声器音质测试系统。该系统采用DSP设计信号发生器,使用数据采集卡对声波信号进行采集,利用计算机进行信号分析与特征提取,并根据特征参数对扬声器的音质进行判断。该系统除可以测试扬声器的各项传统指标外．还可进行纯音检测。该系统可靠、稳定．具有较高的性价比。     

基于DSP的列车应变力测试系统设计

本文介绍了基于TMS320VC33　DSP芯片的应变力测试系统的设计,给出了结构原理框图,并围绕DSP设计了测试系统的中断、复位子系统、存储子系统和通信子系统。同时还对测试系统进行了信号完整性分析。     

基于DSP的振动测试系统设计与实现

以DSP芯片TMS320VC5402例，论述了利用DSP芯片进行振动测试系统设计的方法。着重分析了振动测试系统中的信号采集、信号处理、DSP的存储器、硬件接口等关键问题。测试结果证明，该振动测试系统具有误差小、速度快、实时性强等特点。     

误码测试仪设计与实现

本文讨论了一种基于DSP、FPGA和触摸屏的误码测试仪的设计与实现。DSP实现对测试系统的控制,FPGA完成误码判别与计数,触摸屏提供人机操作交互界面。本文重点讨论了系统硬件FPGA设计和软件DSP设计,测试结果表明该误码测试仪工作稳定可靠,可实现对传输设备通信质量的检测。     

基于DSP的光纤1553总线数据传输板卡设计

阐述一种符合FC-AE-1553光纤总线协议的设计，以DSP处理器作为主控的光纤1553数据传输板卡，它采用模块化设计原则，包括DSP系统、光纤传输系统、供电系统，同时对EMIF总线进行逻辑设计，光纤传输速率满足2.5Gbps。搭建测试平台，对板卡的稳定性及光纤数据传输的功能进行验证。     

某新型火炮随动系统的性能测试系统设计

提出一种新型火炮随动系统的性能测试系统设计,采用TMS320LF2A07A DSP作为火炮随动系统性能测试系统的核心,利用DSP的捕获单元完成了随动系统跟踪速度的实时数据采集,并详细介绍CAN总线通信模块的设计.测试结果表明,该测试系统满足设计要求,效果良好.     

TMS320VC5410 CCS 2.2上实现指纹预处理的嵌入式应用研究

嵌入式指纹识别是目前指纹脱机系统的研究应用热点，其核心是DSP系统。本文就此采用TI的高速DSP芯片TMS320VC5410集成开发环境（IDE）CCS2．2对其实现进行了研究，并用极值滤波、平滑滤波、拉普拉氏锐化、二值化对指纹图像进行预处理。系统EVM测试得出，预处理的时间为0．18～0．3s，需要DSPCPU资源为约30000MIPS。达到了DSP实现指纹识别实时性能要求。     

JPEG解码器的软硬件协同设计

JPEG压缩标准已被广泛的应用于数码相机、图像网络传输等众多领域，实时处理对JPEG解码器提出了更高．的要求。本文设计出适合JPEG快速解码的嵌入式可重构32位DSP(Digital Signal Processing)，并基于此款DSP结构对JPEG解码器进行了系统和局部的优化。实际测试结果显示，相比传统的解码器，改进后的JPEG解码器平均解码周期降低了80％左右。     

基于可控电流源的太阳电池模型参数测试方法

太阳电池等效模型参数测试是太阳电池生产应用与光伏研究的必备环节,针对传统太阳电池测试系统不但成本高,而且无法测试交流模型参数,提出了一种基于可控电流源的太阳电池等效模型参数测试方法,并成功搭建微型测试系统.实验结果表明,基于该方法搭建的微型测试系统不但可以精确测量太阳电池的直流模型参数(并联电阻Rsh,串联电阻Rs,开路电压Voc,短路电流Isc,填充因子FF,最大功率Pmax,转换效率η),而且可以测量电池的交流模型参数(寄生结电容Ci),同时还可以用于判断电池组件的内部结构.该系统测试相对误差小于4％,实验数据表明了该系统在太阳电池光电特性研究中的科学性与可靠性.     

一种在CCSS中与DSP进行联合仿真的方法

本文主要介绍一种在仿真软件CoCentric System Studio(CCSS)环境下运用DSP开发包（DDK）进行DSP联合仿真的方法，该方法可以将算法仿真结果与DSP的具体实现结果在同一环境下进行测试、比较，降低了仿真与测试的复杂度，适用于含有DSP的系统仿真。     

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