模拟到数字

A video card , also called a graphics card or video adapter , converts digital output into an analog video signal that is sent through a cable to the monitor .

视频卡也称图形卡，显示卡或显示视频适配器，它将数字输出转换成通过电缆发送到显示器的模拟视频信号。

Prior to acquisition system are the analog signal into the computer can recognize the digital signal.

以前系统都是将采集到的模拟信号转化成计算机能识别的数字信号。

Scanner is a relatively sophisticated equipment, it is necessary to use at work within the photoelectric conversion device to convert analog signals into digital signals, and then to the computer.

扫描仪是一种比较精致的设备，它在工作时需要用到内部的光电转换装置，以便把模拟信号转换成数字信号，然后再送到计算机中。

Vidicon collect simulate image in period of time and send to computer or DSP chip through video collection card digitlization,use computer to gain eyewinker and process digital image processing:using image area segment and boder measure to calculate area and perimeter;using image smoothness to wipp offthe infection of yawp;using dynamic background and image suited technology to overcome the infection of ray;calculation the parameter of eyewinker(area, perimeter,round measurement, proportion characer and invariant monent),using least norm to design the linearity classify parts,using image matching technologyto classify eyewinker,and to judge whether the eyewinker is harmful to diff background,if the eyewinker satisfy the character require of harmful object ,system will auto-stsrt alarm device. If there ia not have found any eyewinker, Vidicon will collect new simulate image and make processing.

本设计是将摄像机或高频头采集到的模拟图像经过视频采集卡数字化后送入计算机或DSP芯片，利用计算机对采集到的一定时间段内的图像进行异物获取，并对异物图像进行数字图像处理：利用图像区域分割和边缘检测以便进行面积和周长的计算，利用图像平滑去除噪声的影响，利用动态背景运动检测法和图像配准技术克服光线的影响，并通过异物的各类参数（如面积、周长、圆形度、比例特征和不变矩等）的计算，采用最小范数分类法设计了线性分类器，利用图像匹配技术对异物进行分类，从而判断异物是否有害，针对于不同的背景，若异物满足有害物体的特征要求，则认为物体有害，自动启动报警装置，如果没有发现有害异物则新摄入的图像将取代前一时间段的图像再进行图像处理。

The inventer controller composed by separated analog devices before has developed into analog-digital or full digital controller based on microprocessor.

逆变控制器的发展经历从分立元件的模拟电路到以专用微处理芯片为核心的电路系统，并从数模混合电路过渡到纯数字控制的历程。

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。

We design hardware logic for salinometer with Quartus II software, and use SOPC Builder to design Nios II, CPU、arithmetical unit、MEMORY、TIMER and other mature IP core are apply to salinometer. We use the hardware description language VHDL to design bottom drives, and make them as customer IP core, such as excitation source IP core、high sensitive digital galvanometer IP core、analog temperature measurement IP core、digital temperature measurement IP core、calendar and time IP core、keyboard IP core、LCD IP core.

使用SOPC Builder软件生成Nios II软核，将CPU、运算器、存储器、定时器等成熟的IP核应用到盐度计设计中，同时使用硬件描述语言VHDL将底层驱动逻辑设计为用户IP核，如激励源IP核、高灵敏度数字检流计IP核、模拟测温IP核、日历时钟IP核、数字测温IP核、键盘IP核、液晶显示IP核等。

XDSL is an end-to-end digital technology like ISDN, so there is no converting and reconverting signals between digital and analog.

XDSL是像ISDN，一样的端到端数字技术因此不需要在数字与模拟方式之间来回转换信号。

Having studied the digital down-conversionprocess of IF signal before the base band process which follows A/D conversion in wireless communication,the paper puts forward a new idea of utilizing the FPGA to realize multi-channel digital signal DDC.Through analyzing the features and performances of CIC filters,HB filters and multiphase-filter,we combine them with decimators and decimate the A/D data,thus reducing the digital signal rate and the load of DSP when processing the base band signal.

软件无线电技术是在通用的开放式无线电智能平台上，通过安装不同的软件来完成各种通信功能，其结构的基本特征之一就是使A/D变换尽量靠近射频端，目前的方案是在中频对模拟信号进行数字化，对中频数字信号进行下变频处理，使数字信号量降低到高速DSP能够处理的程度[1]。

From high numerical apertures to low wavelengths, hypothetical resists to arbitrary mask structures, simulation offers the ability to run "experiments" on steppers that you do not own with photoresists that have yet to be made.

从高度数字的孔到低点波长，假设的抵抗到任意的面具结构，模拟提议能力到奔跑在高抬腿运步的马上&实验&哪一你做不自己的与 photoresists 哪一有仍然是制造。

This paper analyzes the compound attractor structure of a new three-dimensional autonomous chaotic system.

分析了一种新的三维自治混沌系统吸引子的复合结构。

ON shut rivals out of their transmission systems and shy away from reinvesting their profits in network improvements.

ON将竞争者挡在了其输送体系之后，并不愿将其收益再投资于网络改建工作。