ODA（数据流光盘存储）技术简介

0引言 电视台网络化、文件化制作的发展对海量数据存储的需求越来越大,高清、3D制作的普及使视频数据量成倍增长。例如,采用相同的压缩算法时高清的数据量是标清的5倍。在高清基础上需要记录双眼图像的3D则使数据量加倍,而未来超高清的4K图像数据量是高清的4倍。     

数据流光盘存储(ODA)技术简介

电视台网络化、文件化制作的发展对海量数据存储的需求越来越大,高清、3D制作的普及使视频数据量成倍增长。例如,采用相同的压缩算法时高清的数据量是标清的5倍,在高清基础上需要记录双眼图像的3D则使数据量加倍,而未来超高清的4K图像数据量是高清的4倍。目前电视台网络化制作和媒体资产管理系统使用的近线、离线存储媒介主要是LTO数据流磁带,但采用线性扫描的数据流磁带存在一些固有的问题。例如,为增大数据存储密度LTO驱动器和磁带每隔几年都会升级,但升级后     

全台网低码率存储解决方案

随着电视台规模的不断扩大,所开通的频道也越来越多,相应的节目需求量也越来越大.传统的节目制作和存储方式已经不能适应需求的变化.数字化、网络化已经成为现今电视台节目制作的趋势.随着数字化、网络化的不断深入,相应的节目存储方式也产生了变化,由原来的视频磁带转向了磁盘和数据流磁带.作为网络核心的存储设备,直接决定了应用的顺利进行,所以选用一款合适的存储产品,将直接决定网络化的成败.     

探究高清数字视频监控系统关键技术及发展

随着现代科学技术的不断发展,视频监控技术日益受到人们的重视和关注。视频监控系统逐渐从模拟化、数字化向网络化、高清化、智能化的方向发展。本文首先从高清的定义出发介绍了高清数字视频监控系统的整体架构。其次分析了系统从高清数字视频信号的采集、传输、存储到显示以及智能化的融合等关键技术,最后提出了高清数字视频监控系统持续完善发展的几点想法。     

清远广播电视台400m2高清演播室视频系统的构建

广播电视技术发展日新月异,数字化、高清化、网络化已经成为广播电视技术发展不可阻挡的趋势.清远广播电视台为适应快速新闻和信息量大的要求,拟建设全新的虚拟演播室系统,包括新闻直播演播室、虚拟录制播出.清远广播电视台400m2高清演播室系统建设项目自2014年立项开始,历时一年,于2014年10月正式直播.本文从安全性、智能管理、标准化、系统构成等方面全面介绍了400m2高清演播室直播系统的视频技术设施及特点.     

电视台制播网存储方案的选择

随着IT存储与网络技术飞速发展,视频制播系统中的设备网络化、数字化已普及,磁盘存储技术在视频制播系统中大量应用,存储设备作为各种数据的载体成为视频制播系统的核心设备,分析比较DAS等数据存储方式,为广播电视台搭建制播网络系统提供参考。     

非编网的存储方式的比较与选择

IT存储与网络技术的飞速发展,电视制作系统设备网络化、数字化、RAID在视频制作系统中的大量应用,存储设备作为各种数据的载体成为制作系统的核心设备,分析DAS、FAS、NAS等存储方式为电视台建制播网系统提供参考。     

高清视频监控中的若干关键技术分析

随着技术的发展,特别是随着计算机技术的迅速发展和推广,视频监控逐渐从模拟化、数字化向网络化、高清化、智能化方向发展,尤其是百万像素高清网络摄像机正逐步在各行各业得以应用,图像质量提高的同时高清监控对带宽的高占用、存储空间高消耗等若干问题也随之而来,本文就如何在IP网络上传输高质量的、高可靠性的高清视频监控信息,关于高清视频监控的编码、传输、存储等若干问题进行分析,旨在帮助高清监控能以较合理的资源消耗带来更大的发展空间。     

电视台前期数字高清摄像机的功能特性与选型思考(上)

随着数字高清技术的日渐成熟,根据电视台节目制作的需求摄像机生产厂家相继推出了多种编码格式的机型以供用户选择。目前,主流广播级高清摄像机的记录介质有三种记录模式:1.高性能的磁带记录格式;2.方便的蓝光光盘记录格式;3.高效快捷的半导体存储格式。这三类记录格式性能特点各有千秋。本文中针对几款具有代表性的高清摄像机系统性能参数进行对比和分析,就电视台实现高/标清同播如何选购前期高清摄像机机型的问题探索其解决方案和建议。     

威海电视台高清播出改造技术方案

随着IT技术的发展,电视播出系统已经实现高清化和网络化,在这种背景下,电视播出系统高清化改造不断实施.以威海市广播电视台高清播出系统改造为例,探讨高清播出系统改造的技术方案.     

高清与标清视频之间的上下变换

随着高清电视的普及和技术的不断发展,目前已慢慢进入高清拍摄和编辑的时代,但高清的传输介质和接收播放设备却远远滞后,很多时候不得不选择高清拍摄标清出片,或者进行高标清视频混编,处在由标清向高清过渡的阶段,如何实现高清与标清视频之间的上下变换成为了一个亟待解决的问题.详细介绍了高标清视频之间相互转换的方法和技巧,并对几种方法的优缺点进行了分析.     

一种提高数字电视节目源利用率的方法

为了充分利用已有的数字电视节目,可以通过录制的方式将其以视频文件的形式保存下来,然后针对每一个视频文件生成相应的索引文件,以方便对指定节目的检索。通过这种方式,不仅可以重复利用已有的节目,而且简化了利用节目的流程。     

Earl Masterson: a fresh slant on videorecording

Both the video cameras and the video cassette recorder-players so popular today use a helical-scan mechanism. This magnetic-tape configuration provides the high data rates necessary for video recording and playback, and solves vexing problems inherent in other options that were intensely studied and developed in the 1950s. The challenge in video recording was to have the recording head move at high speed across the tape surface, yet have the tape move relatively slowly from reel to reel to allow sufficient playing time. In the innovative configuration that turned out to be superior to the other options, the tape winds helically around a cylinder carrying a spinning head, so that closely spaced tracks cross the pickup and recording gaps on a diagonal. This videotape concept originated with Earl Masterson, and here, the author presents an overview of his career     

Data Extraction from a Video Display

A device for the extraction of data from a video display is described. A medical research application using a video tape recording of a densicardiogram as an example is explained. The methods of recording, reproducing, digitizing, and analyzing cardiovascular characteristics is described from the standpoint of development experience. Further applications outside of the medical field are suggested.     

Achievements in rotary head magnetic recording

The principal achievements since 1980 in rotary head recording on magnetic tape are outlined. These developments are related to fundamental improvements in recording media, heads, the design of tape transports, and signal processing. The D-1 and D-2 video tape recorders (VTRs), the Hi-Band 8-mm video cassette recorder (VCR), and the rotary digital audio tape (R-DAT) recorders are discussed. The future of rotary head recorders for consumer digital VCRs, professional high-definition TV (HDTV) VTRs, and consumer HDTV VCRs is assessed     

Nucleation-film/Electron-beam recorder: Near-real-time display system

A direct electron-beam recorder (EBR) for nucleation film has been built and tested. This recorder overcomes many of the disadvantages of CRT-on-film recorders by providing a high-resolution black-on-white image that is available for viewing 1 s after recording. Immediate viewing of the film record eliminates the need for a CRT display with storage for viewing images from line-scan reconnaissance sensors. Nucleation film is developed by the selective condensation of zinc vapor on nucleation sites produced by electron exposure. It is developed in vacuum, adjacent to the recording electron beam. The image has a contrast of 8:1 for an exposure of 2 × 10¹¹electrons/cm². This EBR display uses 70-mm film at speeds of 0.08 to 8.3 cm/s to record a video image from a line-scan reconnaissance sensor. This contrasts with a previously described nucleation film/EBR that recorded high-resolution television images at 60 fields/s on 35-mm-wide film transported at 43 cm/s. The present recorder/display has an image viewing area 6 cm wide by 22 cm high where the 70-mm-wide film moves from top to bottom. The video bandwidth is 5 MHz and the horizontal resolution is 2400 lines. A major accomplishment of the work reported here was the design of a zinc vapor source with uniform flux for development of the 70-mm-wide nucleation film in a 0.5-cm space adjacent to the recording electron beam.     

有线电视环网传输技术研究

随着有线电视数字化的发展,广播电视的音视频基带信号已进行了数字化处理,电视前端的信号处理系统已实现了数字化改造?但目前有线数字电视的传输系统仍然采用射频调制的传输方式,而由于有线电视数字节目的扩容,高清节目,互动电视的开播以及有线数字电视信号传输的安全稳定性越来越重要等因素,这种传统的射频传输方式已不适应有线电视数字化的进一步深入发展? 结合目前的数字电视平台和数字通信领域的传输技术,阐述了数字电视信号在同步数字体系(synchronous digital hierarchy, SDH)传送的基本原理,分析了基于SDH网络的数字电视平台基本架构,并对基于ASI信号和基于IP信号的数字电视传输网 的组网方式进行了对比,经过比较得出有线电视的环网传输更适宜采用基于IP网络的传输架构?     

Color EVR

In electronic video recording (EVR),? the color television signals are recorded on a special 8.75-mm-wide, high-resolution photographic film, with two frames side by side. One frame contains luminance information; the other, coded chrominance information. Sound is recorded on two magnetic edge stripes. An 18-cm-diameter cartridge can play 25 minutes of color programming or twice that duration of black-and-white programming. Described in this article are the processes that, starting from an original program on video tape, produce a reproduction with excellent fidelity upon playback. A detailed explanation is provided of the mechanical, optical, and electronic arrangements?including the transcoding of the chrominance signal into a conventional color television signal.     

机载多路数字视频记录仪的设计与实现

视频的压缩记录是现代航空技术中很重要的一个研究内容，通过它可以实时记录飞机的多种直观信息，对飞行指挥和作战训练起到积极的指导作用，本文介绍了一种现代数学图像处理技术实现机载多路数字视频记录的方法，与传统的模拟记录方法相比，该方法具有记录容量大，记录时间长，图像质量高等特点。     

Magnetooptics: A thermomagnetic recording technology

Erasable magnetooptic (MO) recording is viewed as a possible successor to electromagnetic recording that is used today in high-performance disk drives for mainframe computers, hard disks, and floppy disks for personal computers and magnetic tape drives. A large number of rare earth-transition metal alloys have been investigated for use as the magnetic recording material. The properties of the films are very sensitive to the film deposition processing parameters. Accelerated life tests show that there are magnetooptic materials that do have all of the necessary properties and stability for use in computer digital storage.