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The related technology of video conferencing is explored and analyzed by this article; the development and present situation of the video conferencing system at home and abroad are also described in this article; the system's communication technology as well as the enabling technology of audio and video synchronization are analyzed and discussed, as well as the architecture of research and development of video conferencing system is also put forward and summarized.

本文分析和探讨了视频会议的相关技术，介绍了视频会议系统在国内外的发展和现状，并对该系统中的通信技术进行了分析。在对系统中的音频和视频同步的实现技术上，做了分析和讨论，对视频会议系统的研发做了架构和总结。

From Chapter Four to Chapter Seven, taking early England as the beginning, then focusing on the United States as well as the trend of internationalization of copyright protection, the author examines how the analog technology and digital technology force the expanding of copyright after the realization of the idea of copyright, including the style of right extending from reproduction right to public perform right and adaptation right, the succession and development of British institution and idea on copyright in the United States, and the process of expanding and change of the basic theories of copyright, the style of right as well as the kind of work driven by new technology like photography, phonograph, piano roll, motion picture, broadcast, radio, TV set, xerography, home video-recorder, computer, internet and so on.

第四章至第七章以早期英国为开端，过渡到以美国为重心，兼及版权保护的国际化趋势。该部分论述版权观念制度化以后，在模拟技术与数字技术的推动下的扩张过程，包括从复制权到表演权、改编权的延伸，美国对英国版权观念与制度的继受与发展，以及版权基本理论、权能体系、作品种类等在照相机、留声机、自动钢琴、电影、磁带录音机、无线电发射机、家用收音机、机械电视机、有线电视、静电复印机、家庭录像机、电子计算机、互联网等新技术的推动下的演变与扩张过程。

In the modern society, with the development of the TV technology in the digital and the multimedia way, the virtual studio technology is the focus in 21 century. As the key in the virtual studio, the matting technology in video will be a good future.

在现代社会中，随着电视技术向数字化、多媒体方向发展，虚拟演播室技术已经成为21世纪的新热点，而作为虚拟演播室系统中视频对象提取技术更是展现出了广阔的应用前景。

Dongming Trace Environmental Technology Co., Ltd., as the son is a commitment to the human eye can visual environmental pollution control and improvement, research and development, as the environmental protection technology, technical advice, technology transfer, technical services, production of high-tech companies, the company statutoryìrepresentative, the total number of 14 enterprises, scientific research personnel 7, accounting for 50% of the total number of employees, our company registered capital of 500,000 yuan, 10,000,000 yuan of liquidity.

东明微量子视环境科技有限公司是一家致力于人眼所及的视觉环境污染治理和改善，研究和开发视环境保护技术、技术咨询、技术转让、技术服务、产品生产的高科技公司，公司法定代表人宋庆春，企业职工总数14人，科研人员7人，占职工总数的50％，我公司注册资金50万元人民币，流动资金1000万元人民币。

Limited company of technology of Beijing gold dagger is big communication holds water at be being registered formally in August 2005, company headquarters is located in Beijing, it is a company of new and high technology that pursues communication technology and communication software.

北京金戈大通通信技术有限公司于2005年8月正式注册成立，公司总部位于北京，是一家从事通信技术和通信软件的高新技术公司。

In ensuring the quality of products under the premise, the company is committed to providing customers reduce costs, the company through the use of the unique open-door water jacket technology, strengthen the automatic control technology, enhanced heat transfer technology and other measures to ensure effective control of operating costs.

在保证产品质量的前提下，公司致力于为用户降低成本，公司通过采用独有的开式炉门水套技术，强化自动控制技术、强化传热技术等措施，确保运行成本达到有效控制。

The company's technology is strong in technology-equipped, ownership from the weaving to the post-production deal with a full set of production equipment and technology, major products are: alkali-resistant fiberglass mesh, fiberglass self-adhesive tape, fiberglass grinding wheel mesh, fiberglass window screening, and an extension of Product: Corner building with metal belt, tapes and other products.

公司技术力量雄厚，技术装备齐全，拥有从织造到后处理生产的全套生产设备和工艺，主要产品有：玻璃纤维耐碱网布，玻璃纤维自粘胶带，玻璃纤维砂轮网布，玻璃纤维窗纱及延伸产品：建筑用金属护角带，纸带等产品。

The products involve mainly in the area of Automation Technology and Building Installation Technology, especially in BIT area Wieland Electric is the inventor of high- and low-voltage pluggable cable/ wire interconnection technology.

特别是在照明与建筑安装技术领域，威琅电气是强弱电综合布线插拔式联接技术的发明者，其技术在世界上为业界中的先驱。

Such components are used in display technology, signal and lighting technology, fiber communication networks, wireless and cell telephony applications, optical and electronic data storage, computer technology as well as a wide range of other high-tech applications.

这种组件用于显示技术，信号和照明技术，光纤通信网络，无线和移动电话应用，光学和电子数据存储，计算机技术以及其他高科技广泛的应用。

Many participation enterprises have demonstrated the independent research and development technology: The Guangdong Mengnalisha ceramics Limited company's most new high science and technology ceramics product ---"the PP board", its thickness only has 5.5 millimeters, had passed on the integrated construction ceramic all functions, but its needed materials were merely the traditional ceramics 1/3, thus has saved raw material amount used greatly, reduced the packing transportation cost; Beijing passes permanently innovates wooden models the technological progress Limited company independent research and development the lumber substitution product match woodware, has the waterproof moisture-proof anticorrosion, the intensity to be high, the turnover number of times many, can recycle, characteristics and so on environmental protection, security; Dalian iceberg group take the technology and the talented person as a backing, makes light highly effective, safe reliable Leng Re, the ecology, the energy conservation, the environmental protection new product with all one's strength, is also the exhibition luminescent spot.

很多参展企业展示了自主研发的技术：广东蒙娜丽莎陶瓷有限公司的最新高科技陶瓷产品———"PP板"，其厚度仅有5.5毫米，具备了传统建陶的所有功能，但其用料仅仅是传统陶瓷的1/3，从而大大节省了原料用量，减少了包装运输成本；北京恒通创新木塑科技发展有限公司自主研发的木材替代产品赛木制品，具有防水防潮防腐、强度高、周转次数多、能回收、环保、安全等特性；大连冰山集团以技术和人才为依托，全力打造的轻型高效、安全可靠的冷热、生态、节能、环保新产品，也是展会亮点。

There are different types of personal loans available.

有许多不同类型的个人贷款优惠。

The above mentioned teaching model of spiral rising can be used to avoid rigidness in teaching.

上述螺旋式上升的教学模式，可以避免教学形成模式後的僵化现象。