Development of Dual Channel TV Transmitterwith Image and Audio Modulators

本文介绍用于机场航班彩色动态信息显示系统的小功率双频道电视发送装置的设计，包括系统的方块组成和工作原理及其主要电路。In this paper,the design of small power dual channel TV transmitter For use in colourdynamic inFormation display system of airport marking and clearing is presented in detail.Themain contents include block diagrams,operational principles and some electronic circuits of thedynamic inFormation display system

新型彩色电视接收机中的画中画系统

画中画的数字视频技术已广泛应用于大屏幕彩电、VTr和视频投影机。介绍nEC、三洋和西门子公司开发的新型画中画系统，及其在彩色电视机中的应用，重点介绍nECμPd42272A和μPd6403/04gfPIPg的特点和应用

课程设计实验教学改革的探讨

介绍了电子工程系课程设计的改革经验，及时更新实验内容，改革教学方法，有效地提高了学生综合应用能力和工程设计能力

Study on the Luminescent Properties and Structure of Yb-Implanted InP (Yb)

用离子注入法配合优化退火新技术制成了一种高效发光材料InP（yb）；用高灵敏度激光光谱仪测量了该材料的发光特性（Pl），并研究了离子注入和退火过程中发光特性的变化，对Pl谱峰作出辨认；用X射线衍射谱（XdS）测量分析晶格结构和注入损伤（缺陷）；研究了原材料的掺杂（Sn）对发光特性的影响；较深入地探讨了该材料的发光机制，并用一改进rE发光中心模型阐明该材料的激发发光过程。A new eFFicient luminescent material of rare earth Yb doped InP(Yb)was prepared by ion implanted method accompanied by a new optimal annealingthchnigue.The Photoluminescent (PL) properties of the material and the peak.changes of PL spectra of InP (Yb) crystals during RE (Yb) implantation and annealing processes have been studied by high discriminative laser spectrome ter.The structure and implanted damage(deFects)of these crystals have been analyzed systematically by X-ray diFFractional spectra (XDS) and PL.The luminescent mechanism of the material has been investigated deeply.And these results have been interpreted by a improved model of rare earth luminescent center

Study of Slotted ALOHA based Anti-collision algorithm in RFID and its system implementation

中文摘要: 无线射频识别系统要实现同时阅读现场多个 R FID标签的关键技术在于找到防冲突算法来解决 R FID标签发送数据的冲突问题。本文首先对基于时隙 A LO H A的各种防冲突算法进行研究比较和分 析, 然后给出仿真结果; 接着, 说明各种不同的标签预测方法和信息帧设置调整方法对系统响应时间和识别效率的影响; 最后, 针对自适应调整方法的防冲突算法及其实现方案进行了进一步仿真分析。 英文摘要：The key technology in reading multiple tags simultaneously is to find an Anti- collision algorithm to solve the data transmission collision in RFID system. This paper first studies several Slotted ALOHA based Anti- collision algorithms, then compares、 analysis and gives out the simulation results; Second, the paper evaluates the influence on the total delay of identification and system efficiency when we try in different ways on tag estimation and frame size adjustment; Finally, the paper further simulates and analyses the adaptive adjustment Anti- collision algorithm, and gives out the results as well

基于时隙ALOHA的RFID防冲突算法及其系统实现方案的分析研究

无线射频识别系统要实现同时阅读现场多个RFID标签的关键技术在于找到防冲突算法来解决RFID标签发送数据的冲突问题。本文首先对基于时隙ALOHA的各种防冲突算法进行研究比较和分析,然后给出仿真结果;接着,说明各种不同的标签预测方法和信息帧设置调整方法对系统响应时间和识别效率的影响;最后,针对自适应调整方法的防冲突算法及其实现方案进行了进一步仿真分析

VMOSFET Low Voltage Drive Power Supply For Stepping Motor

论述了开关管采用n沟道VMOSfET构成中功率步进电机低压驱动电源的设计；给出了斩波开关控制电路、运行或锁定稳态电流自调节电路、边沿加速电路及电机驱动用功率半导体器件的选择。The design of low voltage drive power supply For medium power stepping motor is described.It uses as n channel VMOSFET switching devices.The chopper on/ofF control circuit,autostable circuit of operation/lock stationary current and edge accelerated circuit are presented.Choice of the semiconductor devices For motor drive is also discussed

System of Cellular Phone's Wireless Headset

用新型器件研制一种汽车司机用的移动电话机小型调频无线耳机的接收发射系统.给出系统的方块组成图并进行电路分析.该系统具有如下特性:座机装置具有节能功能;抗噪声干扰性能好;全双工系统;小型轻量;容易操作,适用于当前流行的多种移动电话机.Compact FM transceiver system of wireless headset for cellular phone are introduced in this paper.The system's block diagram and circuit analysis are presented respectively.System's features are listed as follows:base unit's energy saving function,noiseproof featre,duplex system,compact and light weight,easy to operate,available to current cellular phone

The Study on Leakage Current Measurement for Electric Appliance

介绍一种电器安全检验在热态耐压测试中漏电流及其波形检测的实现.系统采用浮动电位的隔离和磁气耦合技术实现高压电路中电流的检测,设计适当的硬件电路处理被测信号以适合计算机数据采集和Windows编程接口,并达到漏电流峰值检测和波形显示的要求.此方法在实际应用中达到了较好的效果.The implementation of leakage current measurement in withstand voltage test at operating temperature for electric appliance safety inspection is presented in this paper. This system detects the current in high voltage circuit by means of insulation of floating potential and magnetic coupling technology. The detected signal is processed by suitable hardware circuits fitting with computer data acquisition and Windows' programming interface. It can detect the peak value of leakage current and its waveform. The method acquires a fine effect in the application.原国家商检局重点科研项目(K9637微机声卡测试系统

基于短时能量和短时过零率的VAD算法及其FPGA实现

介绍了一种基于短时能量和短时过零率的VAD算法,并对该算法进行了硬件实现。对其中主要的运算模块——滤波器和平方器模块,在硬件实现方法上进行了优化和改进,取得了较好效果使其在保证实时性要求的同时节省了资源,为进一步向低成本器件上移植或系统中作为IP模块应用提供了可能性