数字传输

So, we combine CobraNet audio network technology, data transmitting technology, MCU technology and FPGA technology to develop interface and program of MCU, controlling PCB board, A/D converter PCB board, D/A converter PCB board, digital audio receive PCB board. At last, we construct a audio network and test it's performances.

本文紧密结合CobraNet 音频网络技术、数据传输技术、单片机技术和FPGA 技术，从事了单片机接口及控制程序设计、控制板设计、A/D 转换插卡设计、D/A 转换插卡设计、数字音频信号收发插卡设计，开发出了一系列音频网络设备，并组网测试。

In this paper, digital baseband transmission system to a simple description, Channel Signal Processor of which are part of a focused on.

本文首先对数字基带传输系统进行了简单的描述，并对其中关于信道信号形成器的部分进行了着重讲解。

Networks are works transmitted in the form of digital signal, as well as by the carrier of internet,including digitized works, digital works and homepage works, the copyright of these three kinds of types respectiv ely belon gs to the people who owns the copyright of original works the author and interne t supervisor.

网络作品是以数字信号的形式和以网络为载体进行传播的作品，它包括数字化作品、数字式作品和主页作品三种类型。这三种类型作品的著作权分别归属于原作品的著作权人、创作的作者和网站管理者。网络作品在网上传输实质上是作者使用作品的方式之一，应由著作权人享有不同于传统复制权和发行权的"信息网络传播权"。

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

This project realizes a chirp communication system to transmit digital information such as voice and video.

本项目在IEEE802.15.4a标准背景下，实现采用Chirp信号传输数字语音和图像等信息的通信系统。

A high performance digital IF radar receiver which uses IF echo and COHO joint process algorithm, field sampling, field processing and remote transmission is introduced. Its performance can meet the requirements of modern high performance radar system.

采用中频回波和中频相参信号联合相干处理，现场采样，现场处理，远程传输的体系结构实现了高性能数字中频雷达接收机，其性能可以满足现代高性能雷达系统的需要。

The jitter mainly includes the jitter caused by transmitting of Line and the jitter occurred by equipments of compound connecter.

抖动、漂移是数字信号中所存在的相位噪声，抖动主要包括线路传输系统引起的抖动和复接器设备引起的抖动。

With digital communication, there is no continuous carrier wave. Instead, bits are transmitted as brief, discrete pulses.

事实上，大量的新的通信设备是数字式的，用数字通信不存在连续的载波，而是把数位作为简单的离散脉冲传输。

A detection system is presented for truth-preserving sampling corer in this paper. Based on control unit AT89S52, the temperature and pressure in the corer are monitored, and moreover, long distance transmission of digital signal is realized in this circuit.

介绍一种对保真取样器内部情况进行监控的检测系统，该系统以AT89552单片机为控制单元，对取样器内部的压力和温度进行检测，并利用RS485接口，实现数字信号远距离传输，在海底沉积物保真取样中有一定的实用性。

As a special plan, it is highly summarized the basis for mapping the city's main achievements in recent years, pointing out the current development trend of the information age, and from the organization, financial, technical, security and other aspects of proposed safeguards, in order to Hebi City the completion of the socialist market economic system and practical basis for mapping the local management system and operational mechanism to achieve 1:5000 digital topographic map of the city's coverage, 1:2000,1:1000 and 1:500 scale digital topographic map series covering the key areas and the current trend of dynamic, fast updates, and built municipal basic geographic information and data systems and their transmission network system, and build e-government improve the Hebi City-based natural resources and spatial geographic information database, to build "digital Hebi" geo-spatial information infrastructure framework, and can basically meet the economic and social development of basic surveying and mapping needs of protection and support.

作为专项规划，它高度总结了该市基础测绘工作近年来所取得的主要成就，指明了当今信息化时代的发展趋势，并从组织、财力、技术、安全等方面提出了保障措施，为鹤壁市建成适应社会主义市场经济体制和本地实际的基础测绘管理体制和运行机制，实现1：5000数字化地形图的全市覆盖，1：2000、1：1000及1：500数字化系列比例尺地形图的重点区域覆盖和现势性动态快速更新，建成市级基础地理信息数据体系及其传输网络体系，建成完善鹤壁市电子政务自然资源与空间地理基础信息库，构建"数字鹤壁"地理空间信息基础框架，以及基本满足国民经济和社会发展对基础测绘的需求提供了保障和支撑。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了