嵌入式智能数字机顶盒系统设计

针对高清数字机顶盒面向家居智能化的发展趋势,设计了基于STIH416芯片与Android操作系统的智能数字机顶盒系统。嵌入式智能数字机顶盒相比传统机顶盒,其在解码能力、功耗、数据流处理以及平台拓展性方面都具有独特的优势。该文就机顶盒系统总体结构进行了介绍,硬件平台方面,对网络接入模块、条件接收系统以及红外接收模块进行了重点设计;软件方面,以Android操作系统为核心,采用松散耦合便于扩展的分层式设计。最后介绍基于移动平台的机顶盒控制端的软件设计。     

Optical services over the intelligent optical network

Optical networks are growing at unprecedented rates to accommodate the explosion in data traffic brought on by new Internet and enterprise applications. Coupled with this growth has been the introduction of client devices (e.g., routers, storage devices, and content servers) at the network edge operating at optical line rates. These two trends are changing the fundamental way in which optical transport networks are being architectured, deployed, and managed. Emerging intelligent optical networks address the traffic scaling challenge. Additionally, when combined with modern service management technologies, these networks open exciting opportunities for delivering new customized optical services directly to end-users, allowing carriers to fully exploit the economics of optical transport. This article presents a network framework for delivering optical services     

论智能配电网自动化开关在配网调度的应用

近年来在智能配电网中应用最早、技术最为成熟的是配网自动化开关,配合故障指示器、配网主站系统等自动化功能在配网调度工作中的应用,为配网故障定位、隔离和恢复的快速性、准确性提供了保障。本文介绍了自动化开关在配网调度的应用情况,阐述了自动化开关实现配网故障定位、隔离和恢复的原理和过程,分析了在实际工作中所存在的问题。     

A 70 mΩ intelligent high side switch with full diagnostics

A new, smart power switch for industrial, automotive, and computer applications developed in BCD (Bipolar, CMOS, DMOS) technology is described. It consists of an on-chip 70 mΩ power DMOS transistor connected in high side configuration and its driver makes the device virtually indestructible and suitable to drive any kind of load with an output current of 2.5 A. If the load is inductive, an internal voltage clamp allows fast demagnetization down to 55 V below the supply voltage. The device includes novel structures for the driver, the fully integrated charge pump circuit, and its oscillator. These circuits have specifically been designed to reduce electromagnetic interference (EMI) thanks to an accurate control of the output voltage slope and the reduction of the output voltage ripple caused by the charge pump itself. An innovative open load circuit allows the detection of the open load condition with high precision (3 mA ±10% within the temperature range from -25 to 150°C and including process spreads). Furthermore, the device protects the load from ground disconnection and is compatible with the new IEC standards concerning burst and surge tests. The quiescent current has also been reduced to 600 μA. Diagnostics for CPU feedback is externally available from the chip by two dedicated pins when the following fault conditions occur: open load, overload and short circuit to ground or to the supply voltage, overtemperature, and undervoltage supply     

嵌入式Web服务器在智能网络家居中的应用

嵌入式Web服务器主要用在远程监测和控制方面,流媒体服务器主要用在网络中传输音视频。将嵌入式Web服务器和流媒体服务器移植到介入网络的嵌入式设备后,客户端借助浏览器对远端的嵌入式设备进行监测和控制。本研究拟在基于ARM11的QT6410基础上,应用嵌入式Web服务器和流媒体服务器来实现智能网络家居系统中现场温度和实时视频监控。     

基于嵌入式的传感器网络智能控制端设计与实现

由于用户信息量庞大且多样,使得传统智能控制端嵌入式操作系统无法对其进行有效控制,能耗不稳且控制效率低。因此,构建能耗稳定且控制效率高的智能控制端嵌入式操作系统,该系统由传感器网络和终端组成。传感器网络由采集模块、微处理模块和智能通信模块组成。采集模块利用PT100传感器采集传感器网络节点信号,并经由AD7793模/数转换器将初始信号转换成电流信号和电压信号。微处理模块集中管理采集模块传输来的信号,并将管理后的信号传输到智能通信模块中进行多步处理,以获取电压和电流的最终信号。终端管理整个系统的工作流程,并通过处理电压和电流的最终信号,提供给用户多种控制指令。软件给出了终端控制信号采集工作的流程图,以及系统调用电压和电流最终信号的代码语言。实验结果表明,所设计系统拥有能耗稳定、控制效率高的特点。     

基于智能嵌入式模块的EtherCAT通讯平台的设计

首先介绍了EtherCAT的通信系统组成、工作原理和通信协议特点,以及赫优讯嵌入式智能模块.完成在PC机上搭载赫优讯嵌入式模块EtherCAT主/从站的通讯测试,并设计出一种基于PC机的EtherCAT实时工业以太网主站和基于ARM的赫优讯模块从站的通讯平台,分析了主/从站数据特点,数据交换方法及其实时性.     

基于嵌入式的智能流速仪研制

流速仪为水工筑建设计提供准确的江河的流速值,随着应用需求的增加,原有的8位单片机控制系统不能完全满足现代水文测量的需要。本文研制了一种旋桨式传感器的智能流速仪,以AT91SAM9261为微处理器,采用CPLD芯片为流速数据采集接口,配以TFT-LCD显示屏,移植uClinux实时操作系统,具有测周、计数、双向测速等多种测量方式,可实现16个通道同步独立检测。系统测量方式灵活,测量时间短,测量精度高,稳定可靠等特点,广泛用于水文检验部门和科研设计院等单位。     

基于嵌入式系统的智能自习室设计

文章研究了基于嵌入式系统的智能自习室设计。智能自习室系统是以单片机为核心,以红外传感模块、温度模块、烟雾传感器模块、无线模块、蜂鸣器等作为主要辅助器件,外部固件采用木板作为基本构架,以传感器作为感知元件,完成对室内环境及各种参数的检测,并将检测到的信息实时返回。控制模块把接收到的数据传输给单片机进行数据处理,然后做出相应的反应。它具有自动控制、节能环保等优点。     

基于ARM的嵌入式智能视频监控系统设计

针对传统PC远程监控系统的一些不足,提出了一种前端具有预处理功能的嵌入式智能视频监控系统设计方案,通过测试,该系统视频目标检测精度较高,能够满足实时监控及智能检测需求,实现了预期设计要求。     

嵌入式智能云控制系统的原理与设计

云是用语言值表示的某个定性概念与其定量表示之间的不确定性转换模型.基于云模型的定性知识推理,以概念为基本表示,从数据库中挖掘出定性知识,构造规则发生器.多条定性规则构成规则库,当输入一个特定的条件激活多条定性规则时,通过推理引擎,实现带有不确定性的推理和控制.以往实现云控制器,主要依赖计算机及相关软件,限制了其进一步的推广应用.针对基于Quartus Ⅱ设计软件和Nios Ⅱ处理器的可编程片上系统进行设计开发,将云控制器在目标电路板的FPGA芯片中进行系统集成,实现以嵌入式云控制器为核心的智能控制系统,具有接口灵活、扩展性强、便于实现等优点.为基于云模型的智能控制系统的工业化应用,提供了硬件设计基础.     

基于开关电源的无线智能家居控制系统

针对目前智能家居结构复杂,成本高昂等的缺点,利用开关电源和单片机设计了一种无线智能家居系统。它将控制指令由遥控器通过无线方式发送到控制器上的无线模块,再由无线模块将指令解析给单片机,通过由单片机控制的开关电源来控制继电器的开和关,从而达到智能化控制家电电源开关的目的。通过实验证实了该系统安全可靠,性能稳定,达到了设计要求,同时该系统除用于家庭设备的无线自动控制外,也可用于家庭通信、家庭安全防范,组建智能家居控制系统等。     

A fast packet switch for the integrated services backbone network

With the projected growth in demand for bandwidth and telecommunication services will come the requirement for a multiservice backbone network of far greater efficiency, capacity, and flexibility than ISDN (integrated-services digital network) is able to satisfy. This class of network has been termed the broadband ISDN, and the design of the switching nodes of such a network is the subject of much research. The author investigates one possible solution. The design and performance, for multiservice traffic, is presented for a fast packet switch based on a nonbuffered, multistage interconnection network. It is shown that for an implementation in current CMOS technology, operating at 50 MHz, switches with a total traffic capacity of up to 150 Gb/s can be constructed. Furthermore, if the reserved service traffic load is limited on each input port to a maximum of 80% of switch port saturation, then a maximum delay across the switch of on the order of 100 μs can be guaranteed, for 99% of the reserved service traffic, regardless of the unreserved service traffic load     

Integration of intelligent network services into future GSMnetworks

This article introduces various difficulties and issues in the basic scenario of integrating intelligent networks (INs) and the Global System for Mobile Communications (GSM). As an example, implementation of Universal Personal Telecommunications (UPT) is considered. This article does not offer a comprehensive analysis, but rather a tutorial view. The separation of cellular networks and IN is not well suited to provide common mobility-related services. The present signaling systems do not enable transfer of mobility-related parameters, such as the cell identity and international mobile subscriber identity (IMSI). A call connection to the service switching point must be set up every time IN services are used from the GSM network. The same information is stored in several network elements, and service creation and management are complex. With those disabilities in mind, two integration scenarios are introduced and their characteristics are compared. However, the aim is not to give detailed guidance for implementation, but rather to introduce different options and describe their most significant characteristics. It is important to be able to provide mobility-based information directly to the IN. Flexible integration calls for changes both in mobile exchanges and signalling systems. Mobile exchanges will be built with additional IN functionality and, in fact, future signalling systems will better carry mobility-related information. Mobility can be implemented with a rather small investment, provided that there are digital exchanges and transmission systems and the basic infrastructure has already been built. The required intelligence can be offered by using the existing Public Land Mobile Network (PLMN) or IN architecture     

基于Zigbee技术的嵌入式智能家庭网关的设计

传统的智能家居系统组建网络多数是采用总线控制技术,而如今随着人民生活水平的提高以及计算机技术、通信技术和网络技术的发展,智能家居逐渐成为家居生活的未来发展方向,采用ZigBee技术和嵌入式Internet技术组建家庭网络并建立家庭网关。因为智能家居不仅可以给用户提供一个安全、健康和舒适的生活环境,并且可以使用户远程监控家居用品和家用电器设备。     

Model-based programming of intelligent embedded systems and robotic space explorers

Programming complex embedded systems involves reasoning through intricate system interactions along lengthy paths between sensors, actuators, and control processors. This is a challenging, time-consuming, and error-prone process requiring significant interaction between engineers and software programmers. Furthermore, the resulting code generally lacks modularity and robustness in the presence of failure. Model-based programming addresses these limitations, allowing engineers to program reactive systems by specifying high-level control strategies and by assembling commonsense models of the system hardware and software. In executing a control strategy, model-based executives reason about the models "on the fly," to track system state, diagnose faults, and perform reconfigurations. This paper develops the reactive model-based programming language (RMPL) and its executive, called Titan. RMPL provides the features of synchronous, reactive languages, with the added ability of reading and writing to state variables that are hidden within the physical plant being controlled. Titan executes an RMPL program using extensive component-based declarative models of the plant to track states, analyze anomalous situations, and generate novel control sequences. Within its reactive control loop, Titan employs propositional inference to deduce the system's current and desired states, and it employs model-based reactive planning to move the plant from the current to the desired state.     

基于Arm-Linux的嵌入式智能家居控制系统的设计

随着嵌入式技术、网络及信息技术的发展,针对人们对智能家居的追求,提出了一种基于ARM9的嵌入式智能家居控制系统的解决方案。介绍了嵌入式Linux系统的软硬件平台,结合实例阐述了嵌入式QT图形界面系统、嵌入式数据库SQLite等关键技术在嵌入式智能家居控制系统中的应用。该方案解决了控制系统的可视化操作问题,提高了系统数据管理效率,并具有通用性可移植到其他硬件或软件平台应用。     

基于嵌入式的智能火灾监测报警系统的设计

监测是预防火灾发生的重要手段,其关键在于对火情判断的实时性和准确性.因此基于嵌入式技术研究设计了一套智能火灾监测系统.该系统借助嵌入式处理器和Linux操作系统,具有良好的实时性、强大的数据运算能力和丰富的控制接口.系统利用红外探测技术实现对火情的监测,并采用了图像处理技术和无线通信技术实现了主动报警.实验结果表明,系统可以有效的监测到火情发生,承担主动报警的任务.     

大型物联网设备中智能嵌入式监测系统设计

当前智能监测系统由于尺寸较大,导致生产成本过高,且安装维护非常复杂。为此,针对大型物联网设备,设计一种智能嵌入式监测系统。给出系统的总体结构,将S3C2440处理器作为核心控制器,依据传感器采集的监测数据对大型物联网设备进行异常检测,当传感器向处理器传输的数据值高于报警阈值时,处理器将利用LCD液晶屏对结果进行显示,发出蜂鸣报警,把高于阈值的数据保存至嵌入式数据库中。详细介绍S3C2440处理器、RS 232串口、蜂鸣器、SD卡、NAND FLASH存储器和传感器的硬件结构。软件设计时,给出系统的程序开发流程和建立Qt/Embedded项目文件的详细代码。实验结果表明,所设计系统不仅监测精度高,且实时性强,整体性能优越。