通信系统

With the continuous development of computer science and technology, the application systems in the future will be multilayer ones based on the object oriented, distributed, isomerous conditions. This kind of system is composed of distributed objects one by one, which have given functions singly. These objects are independent of network protocols, programming languages, and software and hardware platforms. These pro- perties make them communicate each other and work corporately.

随着计算机科学技术的不断发展，未来的应用系统将主要是建立在面向对象的、分布的、异构的、自治的环境中的多层应用系统，系统主要由一个个分布式对象组成，对象各自具有特定的功能，可以跨越平台，独立于网络协议、编程语言和软硬件平台，实现相互通信，协同工作。

The development trend of aeroengine control system is distributed control system,and communication based on data bus is the key technology of DCS.

航空发动机控制系统发展趋势是分布式控制系统，基于数据总线的通信技术是分布式控制系统的关键。

The data communication technology between DCS and DEH are widely used in power plants, and it makes the operation more efficient and safe with the control mode of shared operator stations for different control systems.

火电厂分散控制系统与汽轮机数字电液控制系统之间数据通信技术的应用越来越多，不同控制系统通过共享操作员站的控制方式对运行人员的操作既高效又安全。

Secondly, the platform of IPTV set-top box named DM6446 is introduced, and then the AVS video coding standard which is implemented as the video coding standard of IPTV is introduced. The kernel architecture, peripheral devices of DM6446 and the key technique of AVS video coding such as transformation, quantization, intra-prediction, inter-prediction, interpolation, and loop filter is introduced in detail. Thirdly, the system procedures of set-top box which are implemented on the ARM side of DM6446 are introduced in detail. This part focuses on the demultiplex of audio and video data, the design of data interface, the playback of audio and video, and the communication between ARM and DSP. Fourthly, the loop filter algorithm of AVS video coding standard is introduced in full detail, and the optimized procedures of the algorithm on the DSP side of DM6446 are introduced, and then the optimized results are presented. Fifthly, the thesis introduces and analyzes the state-of-art technique of deblocking filter, and proposes a deblocking method, and then the results of proposed method are given. Finally, summarize of this thesis and further development is given.

首先对IPTV技术、视频编解码技术以及去块滤波技术做了简要介绍；然后介绍了IPTV机顶盒的实现平台DM6446，并介绍了该处理器的外围接口和内核结构，同时介绍了作为本IPTV系统视频标准的AVS第二部分视频标准，以及该标准中变换量化、帧内预测、帧间预测、插值和环路滤波等多个模块的算法；接着，详细介绍了机顶盒系统相应程序在DM6446 ARM核上的实现，重点介绍了音视频系统码流的解复用、数据接口设计、音视频的播放以及ARM核与DSP核之间的通信；然后，详细介绍了AVS视频标准中环路滤波算法及该算法在DM6446 C64+内核上的优化，并给出优化结果；然后对去块滤波算法进行了研究并提出了一种环路滤波方案，同时给出了此方案的实验结果；最后总结了本文的工作，并提出了可以改进的方向。

With the rapid development of computer ,micro-electronics and network, embedded system has been widely applied in the national defence, industry, medical treatment,etc.lt is very meaningful and important to develop a general platform, which is an integrated production of embedded control, signal processing and network communication, and provide a programmable hardware interface and a friendly interface, which can improve networking flexibility, system reliability and developability.

随着计算机技术、微电子技术和网络技术的飞速发展，嵌入式系统在国防、工业、医疗等诸多领域的应用越来越广泛。研制一个集嵌入式控制、信息处理和网络通信于一体，且提供可编程的硬件接口和友好的软件开发界面的通用平台，对于提高分布式测控系统的组网灵活性、系统可靠性和可开发性都具有重要的意义。

According to the analysis of the system's requirements we have got the data requirements and the elementary function requirements. Based on this, we set up a sample framework solution for the application of combination of GPS and GPRS.

在此基础上对系统进行需求分析，得出了本系统的数据需求和初步的功能需求，同时提出了结合GPS定位与GPRS通信的电子导游系统的解决方案。

In recent years, systems which based on fractional differential and integral fractional, have been researched extensively, involving fractional circuit, fractional digital signal processing, fractional dynamics control systems and fractional-Chaos and super-chaos, Chaos Control and fractional chaos synchronization, and security communications. And a lot of theoretical and practical results are obtained.

故而近年来基于分数阶微分和积分的分数阶系统已在动力学系统中得以较为广泛的研究，其中涉及分数阶电路、分数阶数字信号处理、分数阶动力学控制系统以及分数阶混沌和超混沌、分数阶混沌控制与混沌同步、保密通信等多个领域，取得了不少的理论和实际结果。

The method of distributed control system composed by PLC technology in glasshouse control is introduced in this paper.

讨论了在温室控制中引入PLC技术构成分布式控制系统的方法，详细介绍了系统的特点、组成、软硬件设计、实时动态监控系统及通信问题。

A supervision and control system for wind-solar-battery hybrid system based on MCGSconfiguration software is designed, and a coordinate control strategy according to thekey data acquisition and judgement of supervisory control system is devised. Under thecoordination control strategy of supervisory control system, total input and output ofhybrid power system are kept balance.

采用组态软件MCGS完成混合发电系统监控界面设计，实现与下位机通信，从而建立风-光-蓄为一体的集中监控系统，对现场设备运行状况进行监控，并通过对关键数据的采集与判断来设计相应的协调控制策略以实现系统功率平衡； 2。

Within the design strategy, a GPRS terminal is connected to the Intemet via the GPRS network, and communications between the meter and client in the AMRS center is implemented by the communication protocol in the GPRS remote AMRS. After practical testing, it indicates that this GPRS TE is characterized with good real-time, high reliability and inexpensiveness.

系统的基本设计思想是将GPRS终端经由GPRS网络接入Internet，按照GPRS远程抄表系统中制定的通信规约，实现表计和抄表系统管理中心的客户端之间数据和命令的信息传输。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。