卫星接收技术在现场直播传输中的应用

本文介绍应用卫星接收技术实现多种电视现场直播方式 ,提出在使用中应注意的一些问题     

卫星接收技术在现场直接传输中的应用

本文介绍应用卫星接收技术实现多种电视现场直播方式，提出在使用中应注意的一些问题。     

卫星接收技术在微波电视联网中的应用

葫芦岛市广播电视微波传输系统,由于原设计中没有考虑到有线电视联网问题,因此,各县（市）区微波站均建在电视发射台,距有线电视台有一定距离。为把中央电视台３套加密节目和市电视台节目传送到各县（市）区有线电视台,实现全市联网,我们采用１１ＧＨｚ调频微波系统...     

IRD及其卫星接收

我国已有１０多个省、自治区采用了数字压缩方式进行卫星电视的传送。上行系统分别由Ｐｈｉｌｉｐｓ（飞利浦）公司和Ｈｙｕｎｄａｉ（韩国现代）公司生产，其编码器复用器和调制器等设备均符合ＭＰＥＧ－２ＤＶＢ－Ｓ国际标准。下行接收设备称为综合接收解码器，英文缩写...     

现代卫星接收天线

本文介绍了国外近期发展的各类天线的结构及技术性能。     

卫星传输到卫星直播

1 前言 19世纪中叶以前,人造地球卫星还是一种科学幻想,只是出现在民间传说和神话故事之中。到1945年10月,才有人提出了向地球赤道上空35786公里的静止卫星轨道上发射卫星,利用这样的卫星作为无线电转播站进行地面远距离通信和广播的设想,而如     

应用数字卫星接收技术延伸微波干线传输

本介绍了应用数字卫星接收技术实现微波干线延伸传输，提出向农村乡镇传送数字电视节目的几种方式及在应用中应注意的几个问题。     

应用数字卫星接收技术延伸微波干线传输

本文介绍应用数字卫星接收技术实现微波干线延伸传输,提出向农村乡镇传送数字电视节目的几种方式以及在应用中应注意的几个问题。     

卫星数字广播传输在山东电台的应用

介绍了山东电视台地球站如何通过卫星数字方式传输山东电台6套广播节目,实现电视和广播节目的同时上星。叙述了广播信号源的地面传输、地球站广播信号监控、广播节目上行系统等几个重要环节的技术实施方案。     

Comparison of satellite and cellular architectures for downlink broadcast data transmission

Traditional voice and video‐oriented networks such as the cellular and satellite networks are being increasingly used to carry data traffic. We endeavour to compare the downlink broadcast performance of the two architectures against each other on the basis of energy consumption, end‐to‐end delay and maximum stable throughput. The architectures are modelled as systems of Geo/G/1 queues. Queuing theory arguments and then sample‐path based comparisons are used to show that the satellite architecture while being more energy‐efficient has a higher delay and a lower maximum throughput. The variation of energy and delay with the total number of receiver nodes is also studied. Copyright © 2006 John Wiley & Sons, Ltd.     

试论直播卫星网络的应用结构模式

阐述了卫星与网络时代的概况和直播卫星网络应用的发展趋势,提出有线电视网与直播卫星网络一体化主张,使之成为中国特色的广播电视网,接着试论服务对象、用户数量预测、直播卫星网络的应用结构模式,以利于加快发展中国特色的广播电视网。     

论音频比对技术在广播播控系统中的应用

为了提高广播节目的安全性,在广播电台的播控系统中,增加音频采集和比对设备,应用音频内容的比对技术,对广播主、备播出通路、开路接收信号和原始播出信号等播出节目信息进行监测、预警以及错误内容记录.为广大的广播系统运维人员提供了有力的系统运维工具,从而提高了安全播出的智能性,减少人为故障时间.     

一种适合低轨卫星通信的宽带传输技术

针对低轨卫星通信过程中功率受限的约束以及宽带业务需求的不断增长,研究了一种宽带传输技术。首先,分析了离散傅里叶变换扩频正交频分复用技术的宽带传输能力以及低峰均比特性;其次,进行了低轨卫星运动场景下的多普勒频移及采样偏差的分析,并在此基础上提出了一种低轨宽带通信的帧结构。仿真结果表明,该技术可有效抗低轨场景下的多普勒残留频偏且能完成高速率的传输任务。     

云计算技术在广播电视网中的应用

介绍了云计算的基本原理和核心技术,阐述了云计算在广播电视网中数字电视互动的技术应用。分析了云计算在广电行业中的典型应用,云计算模式通过整合广电系统中的计算资源,将各种应用建在云端,降低了终端的要求,同时能够有效地扩展和升级,推进三网融合。     

Communicating via a processing broadcast satellite

Three dependent users are physically separated but communicate with each other via a satellite. Each user generates data which it stores locally. In addition, each user sends a message to the satellite. The satellite processes the messages received from the users and broadcasts one common message to all three users. Each user must be capable of reconstructing the data of the other two users based upon the broadcast message and its own stored data. Our problem is to determine the minimum amount of information which must be transmitted to and from the satellite. The solution to this problem is obtained for the case where subsequent data triples that are produced by the users are independent and identically distributed. The three symbols within each triple are assumed to be dependent. Crucial for the solution is an achievability proof that involves cascaded Slepian-Wolf (1973) source coding     

Means and verification of broadcast technology applied to laser transmission on horizontal link

At present, there has been great progress in the field of the point-to-point laser communication technology, in other words, the traditional laser communication technology has been advanced day by day. Furthermore, in order to search for an effective means of achieving localized laser broadcasting communication within a limited range, an effective method of horizontal link laser broadcasting communication is presented, and the corresponding verifiable broadcast communication system is designed. In addition, the laser broadcasting is systematically studied by one physical model built at the optimal distribution of optical power. First of all, the theoretical model of laser beam expansion and the theoretical model of parallel light curtain are made comparisons and analyzed from the angle of attenuation of optical power, and the optical power loss model of the parallel light curtain is established as a result. Secondly, combined with the theory of optical imaging transformation based on Gaussian beam, the field distribution of far field of parallel light curtain is simulated by one leading optical and illumination design software and the relation between the filed distribution of far field of light curtain and the distance of transmission is revealed. Finally, the superiority and feasibility of the parallel light curtain theory model are verified by field communication experiments in different information channels.