基于TMS320C6416的DRM音频解码实现及优化

给出了数字广播调幅系统DRM的AAC音频解码器在定点DSP芯片TMS320C6416上的实现方案,从多方面对AAC音频解码器的关键技术进行优化.实验结果表明,算法的运行速度提高了10倍,存储器占用情况有较大改善,为DRM广播信号解码系统执行音频解码之前的解调和信道解码程序节省了很大的周期资源和处理空间.     

基于软件无线电技术的数字调幅广播系统

数字广播是继调幅广播、调频广播之后的第三代广播方式,它的出现标志着广播系统正由模拟向数字体制过渡。目前比较成熟的数字调幅广播(DAB)技术被认为是近期发展的重点,本文介绍了一种基于软件无线电技术的DRM系统,该系统可以实现从当前的模拟广播到数字广播的平滑过渡。     

一种基于PKI的DRM广播系统设计

根据广播网络的实时和单向等特点，给出了一种综合使用广播网络和传统互联网、无线通讯网络，采用公钥基础设施为基本架构的DRM广播系统设计，并进行了相关的系统安全性分析。     

全球数字广播系统音频编码器的软件实现

全球范围的数字广播系统DRM(Digital Radio Mondiale),是一种针对30MHz以下频段的数字声音广播系统。和传统广播系统相比,DRM数字广播系统在声音质量上是模拟调幅广播无法比拟的。这其中的关键之一在于DRM系统引入了新的信源编解码技术——MPEG-4标准的AAC(Advanced Audio Coding,先进音频编码)。在分析符合DRM标准的AAC音频编码器原理基础上,提出了一种改进的离散余弦变换算法,并在PC上实现了基于该算法的AAC音频编码器。实验表明,该软件编码器能够满足DRM系统实时性要求。     

数字调幅广播外辐射源雷达的研究

数字调幅广播DRM（Digital Radio Mondiale）是最近几年发展起来的使用30 MHz以下频段数字广播的新标准,发射正交频分复用( OFDM)调制信号,作为取代传统中短波模拟调幅广播的新标准在全球正在迅猛发展。DRM的外辐射源雷达工作在高频段具有外辐射源雷达和高频雷达的多种优点,文章主要研究的是DRM广播新体制高频外辐射源雷达进行理论分析并验证,为后续目标探测研究奠定了基础。     

无线通信

Ti与RadioScape首推DRM6月3日,德州仪器(T I)与RadioScape宣布推出针对数字无线电广播通用标准(DRM)的全球首批芯片及模块,加速多标准接收机的开发及部署,从而推动全球数字无线电广播的发展。据了解,DRM是短波、中波以及长波AM广播频段的惟一通用型非专利数字无线电广播系统,许多现有发射机经过简便修改后均可实现低成本升级,以承载DRM信号,使听众可接收到接近于FM质量的广播音质。RAD演示智能以太网划分6月2日,RAD演示了一种支持运营商通过以太骨干网为企业客户提供不同级别以太网服务的解决方案。RAD的ETX智能EOF(Etherne…     

嵌入式DRM接收机中数据业务的研究与应用

基于欧洲电信联盟(ETSI)公布的DAB多媒体对象传输协议(MOT protocol),提出了一种DRM广播数据业务的软件接收机方案,并详细叙述了数据业务的组成、传输模式和解码过程。该接收机的硬件工作平台以DM3730处理器为核心,搭载Windows Embedded CE6.0操作系统,实现DRM广播系统音频和数据业务的实时接收。经测试,该设计能够准确实时地获取DRM广播信号所提供的数据业务。     

Dream软件接收机分析

在介绍了基于PC的数字广播(DRM)软件接收机的意义、可行性之后,首先分析了一种DRM软件接收机--Dream的系统结构,建立了DRM信号模型.然后基于信号模型重点研究了Dream软件接收机中的信道估计和同步算法原理,并对其软件设计结构进行了分析.最后通过仿真验证了其具有较好的解调性能.     

光盘数字版权管理系统(2)

2.1什么是DRM? 2.1.1 DRM定义DRM存在许多字面解释,有时表示数字版权的管理,有时表示版权的数字管理。一般来说,DRM是用来管理版权的系统。在不同的环境下,管理版权包括下面内容:     

一种基于PKI的DRM系统

利用现有的PKI技术来建立DRM数字版权管理系统。提出的PKIDRM系统可以实现DRM用户的匿名认证,保护用户的个人隐私。另外实现了对数字产品许可证的动态管理,DRM用户可以在不同的计算机上使用自己购买的数字产品许可证,可以通过DRM系统进行数字许可证的转让和撤销。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.