传输

The invention discloses a digital good transaction system and the method. It mainly carries on coding process to at least one digital good in a content downloading center into a coded digital good, and the coded digital good will be transmitted to at least one content downloading station with real memory transmission path, when the consumer selects a digital good, the user can uses a content downloading card into a content downloading station, uses a reality transmission path to store the digital good to be purchased, and uses a network transmission wire to connect the content downloading center, the center incriminates the card number in order to generate a card number decoding data, and download the decoding data into a content downloading card, when the consumer want toe buy a digital good, the content can be downloaded into a content card reader, and the reader incriminate the card number to reduces the decoded data and the digital good, in order to generate the digital good which can be read and used.

本发明公开了一种数字商品交易系统及其交易方法，其主要是将至少一数字商品在一内容下载中心进行加密处理以成为一加密数字商品，而加密数字商品将以实际的储存器传递线路以直接送到至少一内容下载点中，当消费者选定一欲购买数字商品时，可持一内容下载卡至其中一内容下载点，利用一实体传输线路直接储存所欲购买的加密数字商品，并藉由一网络传输线路以连接内容下载中心，内容下载中心将根据卡号识别码以产生一卡号解密资料，并将卡号解密资料下载至内容下载卡，当消费者欲使用欲购买数字商品时，即可将内容下载卡置入一内容卡片阅读机中，而内容卡片阅读机将根据卡号识别码以还原卡号解密资料及加密数字商品，以产生可供读取使用的数字商品。

And we also succeed in inosculating the technic of multithreading、 multiple buffers、 windows socket、 IP multicast and RTP real time transmission by using Visual C++6.0 and MS Directshow SDK, and obtained a good result. At the same time, we carried on researching the robustness of this software. We made the research findings of digital video transmission based on network used in applications of banks, and got very good social effects and economic benefit.

本文主要在以下方面做了深入的工作： 1、结合数字视频监控应用的需求分析，对研究网络视频传输技术的意义做了阐述和分析，并就如何充分利用现有网络资源和成熟的多媒体计算机技术进行视频监控等领域的具体应用做了有益的探索； 2、对&数字视频的网络传输&应用中所涉及到的关键技术进行了深入的分析、比较，并进行了有机的融合。

And then, the paper also introduces the simulation tool software MATLAB which is used in the project, and introduces each module of OFDM including the channel coding, interleaves, modulation, the fast Fournier transformation and the wireless channel in this simulation. Finally, the paper analyzes the flowing diagram of OFDM and carries on the simulations on the simplification module which does not affect the research of the transmission, and then discusses the results obtained from the simulation experiments.

首先介绍了OFDM的历史背景发展现状及趋势研究意义和研究目的及研究方法和OFDM的基本原理基本模型OFDM的基本传输技术及其应用，然后介绍了本课题所用的仿真工具软件MATLAB，并对其将仿真的OFDM各个模块包括信道编码交织调制方式快速傅立叶变换及无线信道进行介绍，最后是对于OFDM的流程框图进行分析和在不影响研究其传输性的前提下进行简化，并且对其仿真出来的数据图形进行分析理解

Lost packets and mangled data can be detected and compensated for by the transport layer.

丢失的报文和损坏的数据可以在传输层上检测出来，并且由传输层来补偿。

Integrating the probe and metering circuit minifies the instrument volume. Using a differential structured sensor reduces measure error. And also digital signal is applied to increase the signal transmitting range and to raise anti-jamming ability.

通过测头与测量电路的一体化设计，精缩了仪器体积；采用差动测头结构，减少了由于环境变化引起的测量误差；使用数字信号传输测量结果，增加了信号的传输距离，提高了抗干扰能力。

Experimental result demonstrate that the method mitigates the impact of bandwidth variety and is also improves the quality of multimedia transmission service.

实验表明该方法解决了有效带宽变化对视频传输的影响，很大程度上提高了多媒体传输的质量。

The tests prove that our method mitigates the impact of bandwidth variety and is also improves the quality of multimedia transmission service.

通过在无线网络中的实验表明该方法解决了有效带宽变化对多媒体传输的影响，很大程度上提高了多媒体传输的质量。

Technology division develops and monetizes core video technologies through the licensing of patents, IC designs and software, while anticipating future standards in an industry in constant evolution.

系统部门提供并集成视频系统和解决方案，在网络传输链的两端担任策略性角色；一方面，帮助广播公司和网络运营商传输内容，另一方面为运营商提供客户接收内容所需要的各种设备。

With this low transmission, it is still possible for the user to transmit bluetooth signals between obstructing walls.

这一低传输，但它仍然有可能的用户之间传输的蓝牙信号阻挠墙壁。

The numerousadvantages of SDH network ensure it outstands outof other digital TV transmissions, and plays an important role.

SDH 网络的众多优点，使它在数字电视的传输中脱颖而出，在数字电视的传输过程中担任重要的角色。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。