数字播控系统若干技术问题的探讨

随着数字技术和计算机技术的迅猛发展 ,电视技术的数字化进程十分迅速。两年前尚未被人们提上议事日程的“电视台播控系统数字化”问题 ,眼下已成为各家电视台必须考虑的当务之急。部分电视台已完成了播控系统的数字化建设和改造。目前较为常见的是用数字切换台播出系统取代模拟切换台播出系统 ,也有用数字矩阵播出系统取代模拟切换台或模拟矩阵播出系统的。模拟放像机被硬盘服务器或数字放像机 (兼容模拟 )所取代。在前者情况下 ,传统磁带放像机起着节目上载机及作为应急播出机的作用。总控系统则由原来的模拟视音频矩阵改造为数字矩阵 (采…     

扬州电视台数字播控系统技术方案

随着采编与制作系统数字化、非线性化和网络化改造的完成,扬州电视台现有传统带基模拟播控系统已难以适应新技术和新形势的要求,为了解决电视播控系统与制作系统的数字化和网络化衔接问题,提高电视节目播出质量和安全可靠性,提高电视节目制作与播出工作效率,顺畅和优化电视节目制作与播出流程,扬州电视台决定于2004年设计与构建基于视频服务器、能够承担四个频道电视节目全硬盘播出任务的数字播控系统。     

数字播控系统改造

本文是宁波电视台四套播控系统改造的技术总结，论述了现有的播出状况、和系统升级改造的系统蛄构和工作原理，以及软硬件的升级改造后取得的一些经验．     

数字播控系统技术方案

分析了数字播控系统可选择的主要技术方案即带基方式、盘基方式和盘带结合方式，指出在现阶段设计和构建数字播控系统应选择盘带结合方式；介绍了多频道盘带结合数字播控系统的软硬件、安全可靠性措施以及管理模式，使节目播出工作在数字化进程中能灵活平稳地过渡。     

硬盘多频道播控系统的设计

本文叙述了以视频服务器为核心构建的多频道自动播出系统,阐述了作者的独特见解,并介绍了河南电视台多频道播控系统的具体实施方案。     

南京电视台网络化数字硬盘播控系统

本文简述了网络化数字硬盘自动播出系统的总体设计思路，介绍了南京电视台6个频道播控中心的总控系统、分控系统、硬盘自动播出系统及自动播出控制网络的构成、功能及工作特点。     

数字播控系统的创新

数字播控系统的创新肖建生中央电视台播送部副主任，高级工程师１前言目前，电视技术正处于不断更新飞速发展的变革时期，从系统规模到设备配置，都在新思维、新观念、新技术的基础上，随着社会和观众的需求而在创新和完善。播控系统又正是整个系统中最为重要、最为关键的...     

数字硬盘播控系统的安全保障措施

数字硬盘自动播控系统是以视频服务器为主要核心，总控矩阵为调度中心，充分发挥硬盘存储优势的系统。采用了提前上载，可避免因录像机等设备出现故障给播出带来的影响，将播出风险提前释放，轻松实现各节目之间的连续播出和各种插播，定时播出等，从而简化了整个播出的工作流程，提高了工作效率，保证了画面的高质量。但是由于数字硬盘播控系统具有数字化、网络化，流程化和自动化等特点，只有保证设备安全、系统控制安全、数据安全、网络安全、调度安全，做好出现突发情况时的应急方案、加强应急预案管理等，才能确保电视节目安全优质播出。下面从这几个方面具体分析。     

Network management and control systems and strategic issues

The development of a network management strategy and a network control system for the large integrated telecommunications network (ITN) at American Express Travel Related Services Company is discussed. Network control relates to operational activities such as the diagnostics, configuration, monitoring, and performance of networks, and network management relates to all of the functions performed to manage network resources. An architecture that addresses both control and management requirements is described. Network control functions are consolidated so that operations have a single interface to the system and can operate dissimilar systems from a single workstation. NETVIEW, a licensed IBM software, performs the functions of a focal point, and the network element management system (NEMS) addresses the management of network elements. The centralization of alarms and/or alerts and issuance of commands provides immediate capability to monitor and resolve network problems through a single set of terminals as well as a platform for further automation through the use of artificial intelligence technology     

Suboptimal digital control systems with bounded control inputs

Bounds on the control inputs to a linear system are dealt with in a manner suitable for online computer control. The method guarantees that for r control inputs the constrained optimum will be located in, at most, r steps.     

Real-time digital simulation for systems control

This paper discusses techniques employed in the discrete modeling of physical systems for digital simulation and control applications. Traditional numerical integration techniques provide accurate means of model making but prove too slow for real-time simulation of complex systems or systems with fast response. For rapid digital simulation, a simplified discrete approximation is sought for the linear integro-differential operators of a continuous system. This discrete operator, a digitized transfer function, yields difference equations hopefully permitting real-time approximation of continuous system performance on a digital computer. Determination of the discrete operator is the essential goal of each of the simulation schemes described herein, though differing initial assumptions and approximations alter the resulting forms. After a brief review of these approaches to simulation, techniques for improved approximations for linear system transforms and for discrete parameter optimization and identification are developed. The optimum discrete transfer function which minimizes the sum of error squared between a linear continuous system output and a linear discrete system output is obtained. By adjusting gain parameters in the discrete transfer function, the simulation result is shown to be improved for various inputs and system nonlinearities. Application of standard variational methods to optimize the desired parameters leads to a two-point nonlinear boundary-value problem which is resolved via the techniques of quasilinearization and differential approximation. The procedure for application of various simulation methods is summarized, and the effectiveness of the methods is shown by the simulation of a second-order, nonlinear system for various inputs and sample intervals.     

实用电视监播系统

1 概述广播电视事业迅猛发展，电视节目播出质量不断提高，各电视台都在想方设法降低电视信号的停播率。电视信号停播主要由以下几方面因素造成：（1）节目源方面，如节目磁带中间断信号、磁带卡片记录时间与实际信号长度不符、转送信号（如现场直播）中断等；（2）播出及传送系统方面，如设备损坏，切换台、矩阵误动作等；（3）人为因素， 如播出值班员未装磁带，人为误操作等。解决电视信号停播问题，必须加强交播磁带管理制度，抓好播出、传送系统的设备维护，提高值班员素质。然而仍然有许多未知因素造成电视信号停播，所以说加强电视信…     

广告串编播网络方案及实施

详细介绍了江阴电视台文选串编播网络方案，从提出需求到具体实施的过程，特别是对硬盘播的主备份自动检测切换的设计，有着独特之处。     

深圳电视台硬盘播出系统

近几年来,随着计算机技术和网络通信技术的高速发展,广播电视技术发生了根本性的变化。从原有的模拟系统逐步走向数字化系统已成为各电视台系统改造的一个方向。而作为电视播控系统,在向数字化播出的转变中,利用硬盘录像机播出则是种比较实用的解决方案。１利用硬盘播出的优越性硬盘录像机与传统的磁带录像机相比,主要有以下优点：（１）硬盘录像机采用了数字处理和存储方式,信道的传输特性非常好,只要在信道的传输范围内（一般为２００ｍ）,图像质量丝毫不受影响;（２）由于采用了硬盘作为存储介质,基本上不受磨损影响,数据可以…     

宁波电视台数字播控系统的软件与联网

1 关于系统的联网。原宁波电视台数字播控系统的主备PROFILE之间(即PROFILE1与PROFILE2之间，PROFILE3与PROFILE4之间)各自通过光纤直接相连。由PROFILE1，PROFILE2、播控工作站1、播控工作站2、上载工作站1及上载工作站2构成了一个局域网，而PROFILE3，PROFILE4、播控工作站3、播控工作站4、     

Equivalence of single-stage and Nstage optimum digital control systems

The system considered is linear with a quadratic performance index. A condition is derived under which an Nstage optimal-control policy reduces to a single-stage policy, with a consequent reduction in the computational effort required for on-line control. The condition is that the number of state variables appearing in the performance index should not exceed the number of control inputs to the system.