查询词典 digital signal processing

The paper introduces the conception of digital home and its development and significance at first. Then it explains the foundation of digital home system platform based on hardware platform and system operation system. Following it talks about the frame hardware system design and the daughter module board of the embedded digital home system platform based on Blackfin. After that, it mainly explains the uClinux kernel's transplantation and realization on the digital home system platform. At last it introduces the embedded GUI—microwindow's transplantation and realization.

首先简单介绍了数字家庭概况以及课题研究的意义；其次从硬件平台和系统软件两个方面阐述了数字家庭的系统平台基础；接着描述了基于Blackfin的嵌入式数字家庭系统的硬件总体设计和子模块设计；然后重点论述了uClinux操作系统在数字家庭平台上的移植与实现；最后详细介绍了嵌入式图形用户界面GUI——Microwindows的移植和实现。

As a private mobile communication system, The digital trunkingmobile communication system was boomed in 1990's, and before this, the appliedprivate mobile communication systems in market are almost the analog systemwith analog voice and digital signalling. And there are no data referring to thesystem design and parameters chosen. It includes the wireless channel accessalgorithm of the mobile terminals, single base station capacity in large regional networks, link designing schemes between the switching control center and basestation as well as the study of the service quality for the multiple traffic. Theseindispensable parameters in design a digital trunking communication system arestudied in this dissertation and some instructive achievements can be got. To provethe correction of the theoretical study, the result was tested with the popularsystem of pan-European digital trunking communication system.

数字集群移动通信系统是九十年代中、后期兴起的专用移动通信系统的一种新体制，在此之前国际、国内市场使用的都是数字信令、模拟话音集群移动通信系统其涉及领域是模拟体制，对数字集群的系统设计的有关参数、方法等的选用及其性能表现并无成熟的文献可供参考，如移动终端的无线信道接入算法、大区组网单基站系统的容量、基站和交换控制中心间的链路设计和多业务种类的服务质量等都是数字集群基站子系统进行设计和开发必须解决的关键技术。

This paper describes the structure of the seven sections of digital tube that principle, the principle of dynamic scanning, decoding principle, and on this basis, using hardware description language VHDL programming cathode seven sections of digital tube a total of four digital display of the cycle 1 - F, and Quartus Ⅱ platform in the realization of the modules on the timing and top-level simulation of timing simulation module, downloaded to the final realization of the development board of the digital characters and the show rolling.

本文还介绍了七段数码管的结构，显示原理，动态扫描原理，译码原理，以及在此基础上用硬件描述语言VHDL编程实现4位共阴极七段数码管循环显示1-F，并在QuartusⅡ平台上实现了各个模块的时序仿真和顶层模块的时序仿真，最后下载到开发板上实现了数字和字符的滚动显示。

Translated Description: Digital Signage Network in China is about the Digital Signage (digital signage, multimedia information distribution system) and professional research analysts, is the number signs, multimedia information distribution system, information display systems, digital signage, electronic bulletin board system,...

Description：中国数字标牌网是关于数字标牌（digital signage，多媒体信息发布系统）的专业研究分析机构，是数字标牌，多媒体信息发布系统，信息显示系统，数字告示，电子公告系统，。。。

The basic technology of PKI include encipher digital signature data integrity mechanism digital envelope double digital signature, digital certificate etc.

PKI的基础技术包括加密、数字签名、数据完整性机制、数字信封、双重数字签名，数字证书等。

In order to improve the reliability of the nuclear Generating Sets and the stabilization of the power system, prevent the long time low frequency oscillation caused by the disturbed of the outside electrical net, assured improving the stabilization margin of the nuclear generating sets in the precondition of enough transient stability, validate the sensitivity of the parameter to the damping of Generating Sets of the MEC5220 digital excitation adjustor produce in Japan that used in the Second Project of Qinshan Nuclear Power Plant, confirm the parameter rationality of the digital excitation adjustor, optimize the parameter of PSS, in this paper, we put up a in-depth study to the principle of MEC5220 digital adjustor produce in Japan by the PSS/E software that develop by the PTI Company in the USA, completed the modeling of the excitation adjustor, PSS, generator, excitor, described the performance of this excitation adjustor, analyzed the essential reason that caused the low frequency oscillation, illuminated the factor that influence the damping characteristic of the MEC5220 digital excitation adjustor. Based on model and emulate, this paper optimized the primary parameter of the excitation adjustor, make a reasonable regulation to the PSS parameter.

为提高核电机组的运行可靠性和接入系统的安全稳定性，防止在外电网的干扰下核电机组发生长时间的低频振荡，保证机组在暂态稳定的前提下提高其稳定裕度，验证秦山核电二期核电机组所配日产MEC5220型数字式励磁调节器参数对机组阻尼的灵敏性，确定数字式励磁调节器的参数的合理性，优化PSS整定参数，本文利用美国PTI公司研发的PSS／E软件对日产MEC5220型数字调节器的原理进行进行了深入细化的研究，完成了励磁调节器、PSS、发电机、励磁机的建模，描述了该型励磁调节器的性能，分析了产生低频振荡的根本原因，阐明了影响阻尼特性的因素。

Acer digital technologies are now the main product lines: ADSL2 / 2 +, WLAN, VOIP, FWT, will soon market the product has: VDSL2, IPTV STB. In 2001, Acer digital technology on its own development and production of ADSL CPE, through the Ministry of Information Industry of the network detection, the indicators are good; in 2003, the company successfully passed the National Product Quality Compulsory Certification (3C Certification); 2003 December, macro digital technology passed the China Import and Export Commodity Inspection Corporation Quality Certification Center of the ISO9001: 2000 quality system certification assessment, and obtained ISO9001: 2000 Quality Management System Certification. In 2004, Acer digital technology VOIP terminal equipment in the Canton Post ASTRI compatibility testing of the indicators are very good; in August 2004, Acer ADSL terminal equipment into the company through a strict CE certification, obtained in license permits the sale of the European Union.

宏成数字科技目前主要产品线为：ADSL2/2＋、WLAN、VOIP、 FWT，即将投放市场的产品有：VDSL2、IPTV STB.2001年，宏成数字科技自行研制与生产的ADSL用户端设备通过了信息产业部的入网检测，各项指标均优良； 2003年，公司顺利通过了国家产品质量强制性认证（3C认证）；2003年12月，宏成数字科技顺利通过了中国进出口商品检验总公司质量认证中心的ISO9001：2000质量体系认证的评审，并获得了ISO9001：2000质量管理体系认证证书。2004年，宏成数字科技的VOIP终端设备在广州邮科院的兼容性检测中各项指标非常优秀；2004年8月份，宏成公司ADSL终端设备通过了严格的CE认证，获得了在欧盟销售许可的通行证。

After analyzing characteristics of urban spatial data, this paper partly implements the integration of spatial data of multi sources and organization and management of sea-large spatial data. Finally, the spatial data managing system makes a uniform management, maintenance and updating on such data as digital linear graphic, digital elevation map, digital orthoimage, digital raster data, reference points and metadata.

本文针对城市空间数据特征分析，部分实现了多源空间数据的集成和海量空间数据的组织与管理，实现了多库一体化分布式城市空间数据管理系统，将数字矢量线划数据、数字正射影像数据、数字高程模型数据、数字栅格数据、控制点数据以及元数据的进行统一的管理、维护和更新。

Digital factory overall operating mode, the resumption of the three digital business card printing and membership card making payroll process, the business card printing and membership card making business moved to traditional business card printing and membership card-making factory, and order small digital business card printing and membership card equipment, such as OKI C9800n as the production of digital business card printing and membership card equipment to add.

数码工厂整体经营的模式为，收回三家数码制卡和会员卡制作门店，把数码制卡和会员卡制作的业务搬到传统制卡和会员卡制作工厂中，并采购小型数码制卡和会员卡制作设备（如OKI C9800n）作为生产型数码制卡和会员卡制作设备的补充。

The development of digital technology influences on the music industry radically on the internet time. The Phonogram and Videogram Producers have to transfer into digital modality. New competition elements penetrate, such as Online-music Operator, the Service Provider, and the Terminal Facilities Producer, go into the industry . Even the Mobile Operator would like to lead the development of the music industry by the music digital operation. There are gambling and amalgamation among groups for the increasing future of digital music.

网络时代数字技术的发展对音乐产业产生了颠覆性的影响，传统唱片公司不得不进行数字化转型，产业链加入了新的竞争力量——网络音乐运营商、增值服务提供商、终端设备制造商，甚至移动运营商以其音乐数据业务欲主导音乐产业的发展，各种力量之间的博弈、融合均为了未来数字音乐极具潜力的发展前景。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。