一种自动拨号报警电路的设计

设计了一种自动拨号报警电路系统。该系统通过MT8888芯片收发DTMF信号。用AT89C51单片机控制整个电路系统，通过电话线实现自动拨号报警。     

新型DTMF信号收/发芯片MT8888及其应用

介绍了新型DTMF信号收/发芯片MT8888的基本工作原理及其在89C51单片机控制下的编程实例，该芯片集成度高、可编程控制、具有多种工作模式，可以广泛应用于有线/无线通信设备和控制系统中。     

智能家居总线式控制开关的设计与实现

智能家居是一个多功能的技术系统,其中智能开关控制家庭内部照明或者其它家电,是智能家居系统的一项重要技术。利用单片机可以实现开关的集中或者分布式控制、网络控制或者电话远程控制。通过AT89S52和AT89C2051将二进制数据送给MT8880变成双音多频信号传输到总线,同时MT8880接收总线上的双音多频信号并解调出二进制数据,实现了智能总线式开关,满足了智能家居系统的要求。     

DTMF信号收、发芯片在微机通讯中的应用

采用DTMF信号实现远距离微机通讯,具有传输距离长、数据准确以及抗干扰能力强等特点,文中介绍了DTMF信号的收、发芯片MT8870、MT5087的功能及引脚,并给出了DTMF信号发生器芯片MT5087和接收器芯片MT8870与单片机接口实现数据传输的应用电路。     

DTMF调制解调器MT8880的性能及其应用

MT8880是具有检测通话滤波器的单片DTMF调制解调器,应用了CMOS技术使其具有低功耗和高可靠性。其中DTMF解调器是基于MT8870解调器的工业标准,发射机利用开关电容数/模转换器产生高精度DTMF信令。内部计数器提供猝发模式,这种单音猝发可用精确定时发送。可选择呼叫过程滤波器,以便微处理机分析呼叫过程中的单音。提供标准微机接口和6800系列兼容,并允许微机选址一个状态寄存器、两个控制寄存器和两个数据寄存器。MT8880-1除了在解调器部分具有接收更低信号电平和特定信号电平拒收的功能外,其它功能和MT8880一致;MT8880-2电性能与MT8880-样,但没有提供分析呼叫过程功能。     

MT2000型发射机谐波滤波器故障分析

在广播电视信号发射当中,MT2000型发射机是一种非常常见的、得到广泛应用的短波发射器.MT2000型发射机在工作过程中,容易出现一些常见的谐波滤波器故障,这些故障的出现会直接导致MT2000型发射机信号发射功能障碍或者停止,对于广播电视信号的正常发射来说影响很大.因此,必须对MT2000型发射机常见的谐波滤波器故障进行分析,找到避免这些故障出现的有效措施.基于此,本文对MT2000型发射机谐波滤波器故障展开分析.     

DTMF信号收、发芯片 MT8888原理及应用

MT8888芯片是MITEL公司采用CMOS工艺生产的一种低功耗、高集成度的DTMF信号收、发芯片，它可方便地与微机接口。文中介绍了MT8888的主要功能结构及控制指令，给出了它的具体应用电路。     

基于PSTN的远程控制系统的设计与实现

介绍了一种基于PSTN的远程控制系统。他采用电话机上的按键作为控制命令按键，以公用电话网作为传输线路，将控制信号发送给远地与受控设备相连接的远程控制系统。该系统使用MT8870芯片作为DTMF信号的解码核心，配合单片机实现对受控设备的控制功能。同时，为了保证系统的安全性，系统通过软件设置了密码。当需要远程控制时，操作者首先要拔打相应的电话号码；电话接通后，根据语音提示输入密码，便可进入对远地设备进行控制的状态。这种控制系统具有简单、廉价、实用的特点，并且较一般的控制系统更为安全可靠。     

浅析非均匀采样信号的频谱和功率

在非均匀采样信号模型的基础上，给出了非均匀采样周期信号的频谱表达式，分析了非均匀采样信号平均功率和模拟信号功率谱的对应关系，并做了仿真以验证非均匀采样信号功率收敛于真值的条件(|fn-fn-1|≠1/MT整数倍)。     

DTMF专用芯片MT8880在通信网数据传输中的应用

DTMF技术广泛应用于通信网中。本文介绍了如何利用MT8880这种DTMF专用芯片实现计算机问的简单的敖据传输，其特点是利用单片机的I／O口模拟产生MT8880的接口信号时序．以89C51为控．4器，利用MAX232实现转换，完成计算机问的数据通信．绔出了MT8880与89C51连接、89C51与MAX232连接的软、硬件设计．     

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.     

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