卫星数字媒体录制系统

卫星数字媒体录制系统是电视节目制作播出系统的一部分,主要负责接收卫星电视节目信号,并把它作为素材存放到网络系统的服务器硬盘上供后期制作和自动播出使用.介绍卫星数字媒体录制系统的组成、录制方式及应用体会.     

卫星数字媒体录制系统

卫星数字媒体录制系统是电视节目制作播出系统的一部分，主要负责接收卫星电视节目信号，并把它作为素材存放到网络系统的服务器硬盘上供后期制作和自动播出使用。介绍卫星数字媒体录制系统的组成、录制方式及应用体会。     

高清卫星直播车录制系统的构建

青海广播电视台高清卫星直播车录制系统作为信号采集主体,其特别之处在于小型便携式、多讯道、多格式处理直播系统。从录制系统总体方案的设计到具体录制系统的选型应用作了综合介绍。经实践表明,该车不仅可以独自完成新闻节目录制和播出工作,还可以与台内现有的卫星转播车、高标清转播车系统进行级联,从而组建起规模更大的电视直播系统。     

浅谈卫星数字媒体录制系统

综述 随着网络化、数字化时代的到来，卫星技术在广播、通信领域得到广泛应用。大量的电视节目播出和交换都通过卫星传送来完成，与地面电视网共同形成了覆盖全球的广播电视网。建立一套数字化、智能化的卫星电视录制系统，是各级电视台获取节目素材、进行节目交流的重要手段。对卫星节目进行录制，建立以数字化硬盘存贮为基础的卫星录制系统，并与节目制作、播出、管理网络相呼应，构建统一数据格式的全数字化录、编、播网络是当今电视台发展的方向。     

东电视台数字化录制系统及其应用分析

电视播出技术的数字化进程非常迅速,目前已经有很多电视台完成了播出系统数字化建设。其中,各大电视台普遍以视音频服务器（硬盘）为核心构建数字播出系统,其优势在于不仅提高了播出的安全性和播出质量,还实现了高系统扩展性及资源的多频道共享。而录制系统是硬盘播出的重要组成部分,是实现数字化自动播出的前提。本文着重对广东电视台数字化录制系统及其应用进行分析。     

电台自动化播出系统的构建与应用

随着数字技术的发展,音频技术与计算机网络结合已成为当前广播电视发展的主流,本文介绍我台自动化播出系统的构建与应用。该系统涵盖广播电台播出、编辑及制作的各个方面,可实现广播级音频节目的自动播出、录制和网络资源的集中管理。     

谈数字音频工作站的管理与维护

近年来.随着计算机技术的进步.广播事业飞速发展,广播中心已实现了从模拟向数字的转变。数字音频自动播出系统是广播电台数字化的基础,它实现了从节目录制、节目单编排、节目审核、节目管理到节目播出整个过程的自动化、无带化,以及播出监控的数字化。     

分布式码流实时监控与录制系统的设计与实现

介绍一种分布式码流实时监控与录制系统.该系统实现江苏省地面数字电视省前端卫星接收、编码、复用、单频网适配、输出、空收各环节信号码流的实时监控与录制,为地面数字电视省前端的安全播出工作提供了可靠的技术保障.     

播出系统的域技术研究和应用

播出系统不仅包括传统的信号总控、分控,还增加了节目的数字媒体化（节目上载、收录等）、播出数字媒体资产的管理、播出系统的安全检测等子系统。传统的播出系统常用的播出、上载子系统主要是基于信号的上载和其他磁带、外来信号等信号源的应用。     

总线式C/S架构和中间架构的全台网分析（下）

（5）全数字硬盘播出网络系统濮阳电视台全数字硬盘播出系统是格非MagiStream 3000媒体服务器的可扩展两路硬盘播出系统。整个二通道硬盘播出系统的主要组成如图5所示。     

Obtaining higher resolution in Asia

Important advances in digital signal processing for HDTV have occurred in Asia. This article outlines these advances, including trends in standard resolution television (STV) and progress in superhigh definition (SHD) imaging. Video coding, video recording, SHD image processing, and digital satellite broadcasting are covered, and trends in digital satellite TV and the challenges facing successful implementation of the technology are presented, as well as future research and development targets for HDTV     

International standards in radio communication

A REVIEW is given of some of the international technical standards activities and Recommendations of the International Radio Consultative Committee (CCIR) for radio communications. A new Recommendation for the digital coding of television signals provides a basis for a single world standard for video signals in broadcasting studios, recording, and exchange of programs. Work is underway on high-definition television and a standard for satellite direct broadcasting downlink. Fixed satellite earth-station antenna standards (developed earlier), and performance criteria for satellite links in the integrated services digital network are being improved. Digital microwave radio relay standards include allowable bit error ratio, channel arrangements, and baseband interconnection. Mobile service Recommendations include system standards for VHF/UHF automated radiotelephony, a future global maritime distress and safety system, and radio paging codes and formats. Standards for the use of ARQ in HF and maritime communications, and the use of Universal Coordinated Time (UTC) in international telecommunications, are based on CCIR Recommendations.     

Particulate recording materials

Information (audio, video, or data) to be recorded magnetically is first encoded into a sequence of time-varying electrical signals which are used to drive a writing head, the magnetic field of which creates, on the moving tape or disk, a spatially varying pattern of magnetization. The reading process uses another head (or the same head) to reconvert this magnetization pattern into time-varying electrical signals that can be amplified and used to drive a loudspeaker, or a TV receiver, or feed data to a computer. Two methods of encoding the information are used; analog and digital. In analog recording, as the adjective suggests, the pattern of magnetization on the recording medium should be a precise analog of the incoming stream of information and the signal obtained on reading should be an exact reproduction of the original. Digital recording involves first converting the information into a sequence of ones and zeros which can then be recorded as a sequence of regions of opposite magnetization. Analog recording has been widely used to store audio and video information while digital recording was used for data recording. This picture is changing and digital recording is now being used increasingly in audio and video recording principally because errors can be corrected dynamically so that the original information can be reconstructed and copied repeatedly and with great fidelity. Whether the recording method used is analog or digital, similar though not identical properties are required of the recording materials and so the distinction between the two methods will not be pursued further.     

Digital Applications of Thermoplastic Recording

Thermoplastic films' unique combination of thermal, electrical, and optical properties results in a versatile information storage medium which finds both digital and analog applications. As a digital storage medium, thermoplastic is best suited as a file memory where large capacity and rapid read access is a necessity. Reading and writing rates are completely independent. The fabrication of either sequential or random access devices using tapes or plates is possible. These couple high density capability with electron beam agility to provide large capacity storage and outstanding performance with regards to data transfer rates and read access. The recording medium consists of a substrate for mechanical carriage, a conductive film for heat developing, and the thermoplastic film. The recording process consists of writing line charges with a data-modulated electron beam and then developing with heat. The surface grooves which are formed can be read optically with a flying spot scanner. The position feedback Information inherent in the recorded data allows tracking along a single groove regardless of density.     

高衍射效率光致聚合物薄膜中全息记录研究

为了研究新的全息记录介质,本文我们介绍一种基于TMPTA单体的光致聚合物材料。我们已经在该聚合物薄膜样品中成功记录三维实物信息及数字静态视差图像存储等,证明具有良好的全息记录与重建的性能。实验结果表明:该材料在记录角度为26°时,不加电压等任何外部条件下的衍射效率接近90%,并且制作简便、容易保存,作为全息记录介质能够有效地重建出高分辨率,高衍射效率的全息再现像。由于该聚合物的高衍射效率并且不需要外加电压等特性,该材料更加适合用于全息图和大数据的永久存储,并且它在大尺寸静态三维全息图显示、三维图像存储、数据储存、全息防伪、全息打印等领域具有较强的优势和潜在的应用前景。     

改善数字全息显微术分辨率的几种方法

从理论和实验上研究了数字全息显微术的分辨率问题。通过分析几种不同数字全息记录光路对记录介质空间分辨率的要求表明,无透镜傅里叶变换全息光路对CCD的空间分辨率要求最低,最能充分利用CCD的带宽;再现像面的空间分辨率在不同方向上的不一致,会导致再现像在空间分辨率高的方向上相对展宽,而在空间分辨率低的方向上相对压缩;再现像的横向分辨率主要由CCD所能记录的物体的最高空间频率决定,它随CCD的尺寸和空间分辨率的提高及记录距离D的减小而提高。给出了消除再现像畸变的方法及实验结果,并提出了3种改善横向分辨率的方法。     

基于S3C4510B的卫星接收复用器的设计

针对数字卫星电视的应用,提出了一套卫星接收复用器的设计方案。该方案实现了将卫星接收功能和TS流再复用功能集成在一个系统中,大大降低了数字卫星电视前端的应用成本,为数字卫星电视平台的搭建提供了一个新方法．     

Mobile P-service satellite system comparison

Several future operators of the mobile handheld telephone (P-service) satellite communications systems are gearing up for system implementation to compete for the mobile handheld telephone market of the future. While these companies are proceeding with system realization, they are also looking for partners to finance these huge satellite projects. Potential partners or bulk users are administrations of national communication systems and operators of national communication satellites. These future partners ask themselves which P-service satellite communication system they should choose. There is not an easy answer because P-service satellite systems come in many varieties. There are the low altitude earth orbiting satellites (LEOs), the medium altitude earth orbiting satellites (MEOs), and the geosynchronous altitude earth orbiting satellites (GEOs). Each system has a different type of satellite repeater: digital regenerative, transparent digital, and the bent-pipe. And each satellite system uses its own modulation/multiple access system. The fact that satellites circle the earth at different altitudes has an impact on speech quality, and, because systems vary in satellite as well as constellation complexity, there are different price tags attached. All systems display ingenious features and will eventually work. Mobile users will decide which system will best serve their purposes. This article attempts to compare six P-service satellite systems and find a method for system selection. By use of self-established system criteria, it is possible to arrive at a P-service system selection. By weighing the system criteria, the sensitivity of system selection can be tested. The results or the selection of a particular system should not be considered a recommendation; rather, the process of selection should be used as a possible guideline.     

Data compression systems for home-use digital video recording

The authors focus on image data compression techniques for digital recording. Image coding for storage equipment covers a large variety of systems because the applications differ considerably in nature. Video coding systems suitable for digital TV and HDTV recording and digital electronic still picture storage are considered. In addition, attention is paid to picture coding for interactive systems, such as the compact-disc interactive system. The relation between the recording system boundary conditions and the applied coding techniques is outlined. The main emphasis is on picture coding techniques for digital consumer recording