通信与广播

1 前言 通信设施的宽带化正在飞速地进展,至今即使通信网络也可以分配高质量的图像内容,而以前这些图像内容只能用广播网络分配。对于广播说来,从数据广播开始,就可以符合个人喜好的交互方式开展多彩     

从广播网络化到网络化广播的发展探讨

本文主要针对广播的发展状况,探讨广播从广播网络化到网络化广播的一些发展变化.主要介绍了如何会产生这些变化,以及网络化广播的特点和优势.使人们认识到网络与广播之间密不可分的关系,以及今后网络化广播发展的方向.     

现代的网络广播--广播在现代网络的应用

网络诞生以来，多媒体技术速序发展。网络广播既保留有传统广播的表现形式，又兼备了互联网提供的交互性。本文在比较了网络广播哉传统广播，详细阐明其优势所在之后，介绍了网络广播的主要技术形式以及采用的技术软件，认为广播与网络的融合这场深刻的革命必将给中国的网络广播带来全新的局面。     

调频同步广播技术的应用现状

调频同步广播技术的优势决定了其受到广泛应用的使命.在意大利,其国家广播电台的调频同步广播已经发展到可以覆盖将近两千多公里的公路;在美国,也可以在400多英里的高速公路上进行调频同步广播;法国、德国等国家也都陆续建设成功了属于自己的调频同步广播网.自2000年技术标准《GY/rI＇ 154-2000调频同步广播系统技术规范》颁布以来,我国如今已经成为了世界上建成同步广播网最多的国家.同步广播网后建成,不仅带来了收听上的方便,也给广播电台带来了经济上的收益.     

局域网中的卫视广播(5)——带有网络接口的卫星接收机DM500S方案

客户端的播放控制方案之五——DreamStream Enigma 1方案DreamStream Enigma 1播放软件是一款专门用于DreamBox机器的播放控制软件,它实际上是将WEB-     

爱立信与CANAL＋OVERSEAS签署多年期广播服务协议

·爱立信与CANAL＋OVERSEAS签署五年期广播服务协议,管理Canal＋Overseas22个频道内容的播放与接收·借助该协议,Canal＋Overseas可提高运营效率,并为客户提供更具吸引力的服务·凭借此次合作,爱立信强化了在广播服务领域的地位爱立信致日前与Canal＋Overseas签署五年期广播服务协议。根据协议,爱立信将提供一系列的广播服务技术支持服务,     

另类收听网络广播的方法

广播作为一种大众宣传媒体,长期以来处于主导地位,而作为接收广播的工具---收音机更是历史悠久。随着互联网时代的到来,各种网络收音机软件不断出     

基于网络的广播电台文稿系统的数字化播出

1引言自从1999年广播电台音频网络建立以来,已经彻底从磁带、开盘带、CD、MD、DAT中解脱出来,实现了数字化的录制、播出,并实现了与多种音频资料的数字化联通。节目源的CD质量在很大程度上提高了播出效果,即使是中波信号,也提高不少。而且使广告便于管理和查询,使广告的经济效益得到提高。2003年乌鲁木齐人民广播电台又引进了LINK2000采编文稿系统,将繁重的文字录入和修改功能进行数字化,并与音频网络连通,实现广播数字化的进一步发展。系统也增加了方便采编部门工作的电话系统,使记者可通过电话录音方式发回最新、最快的新闻,实现新…     

浅谈Air5播出系统在电台的使用

本文以英夫美迪Air5播出系统为例,描述了播出系统的整体关系、S1config数据关系,对节目安排和节目播出的处理流程作全面剖析,对这套播出系统存在的问题进行探讨.     

加强广电台站管理构建和谐电波秩序

近年来，随着广播电视事业的发展，广播电视系统的无线电台大量增加，极大丰富了人民群众的精神文化生活，但广播电视系统无线电管理存在的一些问题也暴露出来，其中，调频广播电台对民用航空无线电专用频率的干扰就是亟需解决的问题之一。     

应用无线技术拓展广播电台音频编播网

探讨了应用无线技术拓展广播电台音频编播网的应用，就无线局域网的构成、原理、特点以及在无锡电台音频编播网的工程中具体组网使用均作了详细的阐述。     

CD by radio-digital radio broadcasting

Engineers have been looking at ways of broadcasting a digital radio service to the general public, which would ideally have the following features: sound quality comparable with that of the CD; reliable reception to all listeners in the coverage area; capability of offering coverage of all listeners; capability of fixed, mobile and portable reception using simple low grains antennas; simple push-button programme selection-no tuning; frequency efficiency, so that many services can be provided in any spectrum available; and capability of operation from terrestrial transmitters and/or satellite. The author describes the requirements of a digital audio broadcasting system regarding intersymbol interference and then discusses COFDM, coded-orthogonal frequency division multiplex. The author also discusses low-bit-rate sound, terrestrial transmission, satellite broadcasting, receivers, frequency allocation and system testing     

Technical advances in digital audio radio broadcasting

The move to digital is a natural progression taking place in all aspects of broadcast media applications from document processing in newspapers to video processing in television distribution. This is no less true for audio broadcasting which has taken a unique development path in the United States. This path has been heavily influenced by a combination of regulatory and migratory requirements specific to the U.S. market. In addition, competition between proposed terrestrial and satellite systems combined with increasing consumer expectations have set ambitious, and often changing, requirements for the systems. The result has been a unique set of evolving requirements on source coding, channel coding, and modulation technologies to make these systems a reality. This paper outlines the technical development of the terrestrial wireless and satellite audio broadcasting systems in the U.S., providing details on specific source and channel coding designs and adding perspective on why specific designs were selected in the final systems. These systems are also compared to other systems such as Eureka-147, DRM, and Worldspace, developed under different requirements.     

认真学习准备务实推进工作

为加强无线电管理工作，规范无线电台站的设置使用，减少广播电视台站等对航空专用频率的干扰，维护好空中电波秩序，有效保障广播电视台站的正常运行，我处于10月16日至17日任池州开展了对广播电视无线电发射台站的检测工作，现已完成检测任务。这次共测试设备7台，其中电视发射机5台，调频广播发射机2台（1台备用），所测设备中一台电视发射机不合格。通过检测，使我们掌握了池州市广电系统设备近期的性能指标，建立的广电系统的台站数据库也更加完善，广电部门的领导和技术人员对维护好设备的重要性的认识也有所提高。     

Performance evaluation of broadcasting strategies in cognitive radio networks

Broadcasting is an important phenomenon, because it serves as simplest mode of communication in a network, via which each node disseminates information to their neighboring nodes simultaneously. Broadcasting is widely used in various kind of networks, such as wireless sensor networks, wireless networks, and ad-hoc networks. Similarly, in cognitive radio networks (CRNs), broadcasting is also used to perform many tasks including neighbor discovery, spectrum mobility, spectrum sharing, and dissemination of message throughout the network. The traditional approach that has been used as broadcasting in CRNs is simple flooding in which a message is disseminated in the network without any strategy check. Simple flooding can cause major setbacks in the network, such as excessive redundant rebroadcasts, and collision drops which collectively are termed as broadcast storm problem. To reduce the effects of broadcast storm problem in wireless networks, we propose and compare four broadcasting strategies for cognitive radio networks in this paper. These four strategies are: (1) probability based, (2) counter based, (3) distance based, and (4) area based. Extensive NS-2 based simulations are carried out on different threshold values for each broadcasting strategy. After experimental evaluation, it is demonstrated that counter based broadcasting surpasses other broadcasting strategies by achieving maximum delivery ratio of 60% and by decreasing redundant rebroadcasts and collision drops up to 44 and 37% respectively.

     

风生水起的移动电台

随着现代人工作、生活节奏不断加快,娱乐文化需求日趋多样化,优质原创内容急剧增加,同时各项信息通信技术超常发展,传统广播业被颠覆,移动电台却由此风生水起。移动电台打破了传统音频与互联网的壁垒,突破了时间和地域的限制,以其强烈的伴随性,受到越来越多人的喜爱,各种移动电台如雨后春笋般涌现。