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The primary work in this dissertation:(1) This dissertation compares the differences and similarities between direct digital waveform synthesizer and direct digital frequency synthesizer.

本文的主要工作之处在于：(1)对直接数字波形合成及直接数字频率合成两种数字波形产生方法进行了分析对比。

Direct digital waveform synthesizer; linear frequency modulated signal; digital-to-analog conlerter; pulse compression

直接数字波形合成；线性调频信号；数模转换器；脉冲压缩

Based on direct digital synthesizer technology and digital orthogonal upconverter AD9857,an arbitrary waveform synthesizer is realized,which can generate arbitrary waveform in the frequency domain of 6~60MHz.

介绍了一种基于直接数字频率合成技术、采用数字正交上变频器AD9857实现的任意波形合成器，该波形合成器可以在6~60 MHz范围内合成任意波形。

This paper systematically researched this sort of nonuniformly sampled signals'digital spectrum structure, signal-to-noise ratio , the response of D/A converter with nonuniformly sampled signals, the algorithm for estimating timing offsets, the relationship between the discrete time expression of the total energy and the continuous time expression, the estimation of the average power, the algorithm of recovery and application in designing and analyzing the digital waveform synthesizer.

本文全面系统地研究了这类周期性非均匀采样信号的数字谱结构，信噪比表达式，数模转换器对非均匀采样信号输入的响应，误差校正算法，时域与频域的能量对应关系，对功率测量的影响，内插恢复算法，以及在设计和分析数字波形合成器中的应用。

Embedded Multimedia System can be used in people's life and work in all its aspects, in the industrial control and business management areas, such as smart industrial equipment, POS / ATM machines, such as IC card; in the family field, such as digital set-top boxes, digital television, WebTV, network refrigerators, air-conditioning and other networks and consumer electronics products, in addition, the system is still embedded multimedia electronic medical equipment, multimedia mobile phones, handheld computers, vehicle navigation, entertainment, military and other fields has great prospects.

嵌入式多媒体系统可应用在人们生活与工作的各个方面，在工业控制和商业管理领域，如智能控设备、 POS／ ATM机、C卡等；在家庭领域，如数字机顶盒，数字式电视、WebTV、网络冰箱、网络空调等消费类电子产品，此外，嵌入式多媒体系统还在医疗类电子设备、多媒体手机、掌上电脑、车载导航器、娱乐、军事方面等领域有着巨大的应用前景。

With the rapid development and wide-spreading use of networking and multimedia techniques, the production, duplication, transmission and publication of digital videos are becoming easier and easier, causing copyright protection of digital video a severer problem in the past few years.

近年来，网络技术与多媒体技术的飞速发展和广泛应用使得数字视频的产生、拷贝、传播和发布变得越来越容易，数字视频的版权保护问题日益凸现出来。

The PXI modules include:PXI-1044 AC power supplies,14 slots and 3U box,PXI-5152 digital module,PXI-4072 digital multimeter module,PXI-5422 function signal generator module,PXI-5660 RF signal analyser modult,PXI-8351 zero slot controller module , PXI-6115 multi-function DAQ module , PXI-4461 dual-channel DAQ module,PXI-2593 matrix module and so on.

根据测试的要求所选用的PXI模块包括PXI-1044交流电源14插槽3U机箱、PXI-5152数字化仪模块、PXI-4072数字多用表模块、PXI-5422函数信号发生器模块、PXI-5660 RF信号分析仪模块、PXI-8351零槽控制器、PXI-6115多功能DAQ模块、PXI-4461双路数据采集模块、PXI-2593多路复用器/矩阵模块等。

In the period of aerodrome constmction project geology recottitaissance, high-resolution ortho-map of working area, 3D Remote Sensing Virtual Reality and animation o planned aerodromes are made with the technologies of Remote Scttstng digital image process, Virtual Reality and digital photogrammetry. By information extracting and comprehensively assessing on the geognosy, engineering geology, environment geology and eco-environment of work area, scientific foundation can be offered to deciders and workers of acrodrome.

在机场建设工程地质勘察中，应用&3S&技术，通过遥感数字图像处理技术、虚拟现实和全数字摄影测量等高科技，制作测区的高精度正射遥感影像地图以及各个拟选机场的遥感图像三维虚拟动态系列动画图，在此基础上进行场区的构造地质、工程地质、环境地质以及生态环境等特征信息提取和综合评价，为机场建设工程决策者和具体的工作者提供科学依据。

Simulative means can appear a kind of amphibolous phenomenon, and digital means can eliminate this kind of appearance, the interference rejection capability of digital means is consequently strong.

模拟的方式会出现一种模棱两可的现象，而数字方式就可以排除这种现象，因而数字方式的抗干扰能力强。

A new era of digital life is approaching due to factors like the integration and upgrading of various user friendly features of GMS digital mobile phones, the 搈arriage of NFC and SIM card technology, and the rapid development and integration of technologies such as the network, Near Field Communication, and computer technology.

随着网络、近距离通信和计算机技术的快速发展和融合， GMS数字移动电话机各种方便用户使用的功能不断得到整合和提升，NFC（Near Field Communication近距离通讯）技术与SIM卡技术的&联姻&就开启了一个数码生活的新时代。

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。