无线高清移动应急视频指挥系统具有无以比拟的便捷性和高性价比

移动高清视频终端HD601是北京紫荆视通科技有限公司自主研发设计的．最新一代具有高清双向视频通讯．视频实时高清存储和回传的3G高清视频移动终端。HD601支持语音／视频对讲．3G和WIFI网络传输能力、GPS导航和大尺寸触摸屏现场控制回放等功能。并且支持WCDMA和EVDO两种模式的3G网络．客户可以根据自己所在地区网络条件选择合适的网络模块。HD601终端支持多卡多通道绑定技术．可以提高可用的网络带宽．以满足特殊条件下实时传输对带宽的要求。HD601适用于车载移动或个人携带等多种环境．满足应急通讯、移动办公、现场验收、现场执法、应急指挥等突发和移动环境下的高清视频通讯。     

高清视频在新一代卫星通信系统中的应用——北京数码视讯科技股份有限公司

视频与图像的传输已经成为卫星通信中的最重要业务。作为全球领先的数字电视及视频通信解决方案专家,北京数码视讯科技股份有限公司多年前就开始关注与研发能用于卫星通信的视频产品。视频高清化、终端设备移动化是卫星通信系统的两大趋势,高清视频在卫星网络中的传输一直面临带宽占用高、信号传输不稳定、视频质量低、应用方式单一等问题,极大的限制了卫星通信系统产品的发展。为解决以上问题,数码视讯推出了基于H.264/H.265格式的高清视频编解码器,结合4G视频传输技术和视频识别技术,     

3G业务运营与创新——移动多媒体采编系统解决方案

从3G网络在电视采编方面的应用出发,提出了3G业务发展的新趋势,即面向集团客户、专业客户的行业解决方案。文章介绍了移动多媒体采编系统的解决方案,提出利用现代3G网络带宽大、性能好的优点并结合高清摄像机、智能3G终端等设备,来提高电视媒体的采编效率。解决了传统电视采编存在的效率低、传输实时性差等缺点。     

5G网络与4K超高清视频制播

本文讲述4K/8K超高清(Ultra High Definition,UHD)视频的信息特征、对无线传输网络的要求,重点论述5G移动通信网的突出特性和对4K/8K超高清视频的承载能力,介绍中央广播电视总台超高清播出的基础架构、管理系统、音视频系统构建,以及在5G+4K+AI建设、制播、新媒体融合方面的发展情况。     

四川移动在蓉开放营业厅TD-LTE体验

本刊讯阳春3月,作为中西部地区率先迈入4G移动通信时代的城市,四川成都迎来了全民体验4G的科技盛宴。四川移动近日宣布,在成都地区19个营业厅开放4G业务客户体验区,方便广大市民体验速度超越3G十到二十倍的4G网络,零距离、零"门槛"尝试高速下载、高清视频通话、高清视频播放、高清视频会议等一系列4G最新应用。4G网络的速度不仅快,还可以支持摄像机通过网络直接进行图像即时传递。在成都高新营业厅的4G体验展     

5G+4K超高清视频产业发展前景研究

现代科技高速发展的背景下,移动互联网的出现给通信行业带来全新变革,通过移动智能终端设备可以实现随时随地上网、语音、通话、视频,也能够在线收看。超高清视频节目满足用户的多样化需求。随着5G技术不断发展成熟,信息传输效率更高,传输更加稳定,为4K超高清视频产业的发展提供重要技术支持。重点将5G技术和4K超高清视频产业,相互融合为4K超高清视频产业发展,作出重要贡献,推动我国移动通信行业全面发展。     

移动时尚生活新的解决方案

皇家飞利浦电子公司推出全新多媒体移动系统解决方案,提升了下一代3G手机的规格标准。NexperiaTM移动系统解决方案7210以低功耗提供丰富的娱乐功能,新手机开发商可以实现包括先进的音频、视频、数字视频广播——手持设备(DVB-H)和FM收音机等功能。整个解决方案支持UMTS EDGE双传输模式(DTM),无论消费者身处哪个网络,都可以在任何时间、任何地点方便地获得丰富的多媒体体验。由于3G网络的部署仍处于早期阶段,网络的覆盖尚不能遍及所有地区。3G手机用户希望能在任何时间、任何地点获得多媒体服务。Nexperia移动系统解决方案7210具有…     

蓝牙多媒体可视移动终端设计

3G的发展与普及对多媒体移动终端的推陈出新提出了全新的、更高水准的要求,需要创造新的智能化移动可视终端。然而由于3G在我国还没有普及应用,现今的GSM,GPRS,CDMA网络宽带不足以支撑数据量极大的视频实时传输播放,因此蓝牙多媒体可视移动终端的设计对蓝牙技术在桌面电话、车载电话等方面的应用具有一定意义。对蓝牙多媒体可视移动终端从系统简介、整体设计方案、主要模块设计等方面进行论述。     

基于4G传输技术的高清电视直播系统的设计

设计了一种基于4G传输技术的高清电视直播系统.本系统以4G传输技术为手段对传统高清电视节目进行传输,可以让用户行随时随地实况直播高清电视,为用户提供较好性价比和灵活性的高清视频传输手段.由于4G比起其他传输手段有很大的提升,特别是与3G相比,在传输带宽、稳定性方面都有很大改进,再加上本系统采用的自适应、多卡多模绑定、负...     

4G外场试验系统正式对外开放明年标准有望形成

技术人员在行驶的测试车上,现场向记者演示了高清格式的视频传输。在上海建成并顺利通过验收的B3G/4G外场试验系统,1月28日正式向媒体等人士开放。在作为4G试验基地的上海工程技术大学校园内,记者在试验车上现场体验了一次非高速行驶速度下的流媒体节目互动,基于IPv6网络的高清格式流媒体视频节目在大屏幕上播放流畅,可以达到80Mbit/s的传输速率,设备屏幕显示的信号切换速度很快。     

基于网络的视频通信系统的设计

随着移动通信和多媒体通信的飞速发展,构建于无线网络之上的多媒体服务已经被越来越多的用户所接受。2．5代移动通信CDMA的典型带宽为30～50kb／s,可以传输低速的视频,但是对多媒体应用来说,其质量还是未能达到要求。在现有技术条件下,如何在CDMA无线信道中保证视频流的质量以及如何扩大带宽提高视频质量,是值得研究的问题。文中提出了一种在多个CDMA通道中进行视频传输的框架,利用多个CDMA无线信道绑定的方法,提高了视频的帧率和分辨率。     

Radio Network Aggregation for 5G Mobile Terminals in Heterogeneous Wireless and Mobile Networks

This paper provides a novel design concept for advanced mobile multi interface terminals with radio network aggregation capability and enhanced quality of service (QoS) provisioning for multimedia services (voice, video and data) in heterogeneous wireless and mobile networks. A new module is established which provides the best QoS and lowest cost for any given multimedia service by using simultaneously all available wireless and mobile access networks for a given traffic flow. This novel adaptive QoS module with adaptive QoS routing algorithm is called advanced QoS routing algorithm (AQoSRA), which is defined independently from any existing and future radio access technology. The performance of our proposal is evaluated using simulations and analysis with multi-interface mobile stations with AQoSRA within, carrying multimedia traffic in heterogeneous mobile and wireless environment with coexistence of multiple Radio Access Technologies, such as 3G, 4G as well as future 5G radio access networks. The analysis of the proposed framework for radio networks aggregation in advanced mobile terminals has shown overall better performances regarding the achievable throughput and multimedia access probability in heterogeneous wireless and mobile environment.     

移动网络中HTTP视频流终端数据分析及应用

伴随移动通信技术的发展,越来越多的用户选择通过移动网络随时随地观看网络视频,移动视频业务迅速增长.在现有的无线视频传输方式中,由于TCP的可靠性以及易穿透防火墙和网络地址转化等优点,基于TCP的HTTP流逐渐成为网络视频的主流传榆方式.另一方面,用户对业务体验需求的上升,也给移动数据的传输带来巨大挑战.该文通过采集和分析HTTP流的终端数据,获到了HTTP流在HSPA+中传输特性及关键参数的特征,分析结果表明其视频块传输速率变化与自回归模型近似,并在此基础上,提出一种视频等级自适应控制算法,能够有效地改善用户体验.     

Cross-layer architecture for scalable video transmission in wireless network

Multimedia applications such as video conference, digital video broadcasting (DVB), and streaming video and audio have been gaining popularity during last years and the trend has been to allocate these services more and more also on mobile users. The demand of quality of service (QoS) for multimedia raises huge challenges on the network design, not only concerning the physical bandwidth but also the protocol design and services. One of the goals for system design is to provide efficient solutions for adaptive multimedia transmission over different access networks in all-IP environment. The joint source and channel coding (JSCC/D) approach has already given promising results in optimizing multimedia transmission. However, in practice, arranging the required control mechanism and delivering the required side information through network and protocol stack have caused problems and quite often the impact of network has been neglected in studies. In this paper we propose efficient cross-layer communication methods and protocol architecture in order to transmit the control information and to optimize the multimedia transmission over wireless and wired IP networks. We also apply this architecture to the more specific case of streaming of scalable video streams. Scalable video coding has been an active research topic recently and it offers simple and flexible solutions for video transmission over heterogeneous networks to heterogeneous terminals. In addition it provides easy adaptation to varying transmission conditions. In this paper we illustrate how scalable video transmission can be improved with efficient use of the proposed cross-layer design, adaptation mechanisms and control information.     

5G边缘计算视讯体验增强解决方案

5G大带宽、低时延的特性正在促进高清视频业务的发展,快速高清视频分发、360°全景、AR/VR/全息视频等多种形式的视频应用极大地丰富了视频应用场景.这些视频业务,如高清视频、网购、直播、虚拟与增强现实等均需要更高的带宽、更低的网络时延为用户提供更好的视讯体验.通过深入分析5G网络中视讯资源下沉到网络边缘所需要解决的应...     

QoE in video streaming over wireless networks: perspectives and research challenges

The deployment of 3G/LTE networks and advancements in smart mobile devices had led to high demand for multimedia streaming over wireless network. The rapid increasing demand for multimedia content poses challenges for all parties in a multimedia streaming system, namely, content providers, wireless network service providers, and smart device makers. Content providers and mobile network service providers are both striving to improve their streaming services while utilizing advancing technologies. Smart device makers endeavor to improve processing power and displays for better viewing experience. Ultimately, the common goal shared by content providers, network service providers, and smart device manufactures is to improve the QoE for users. QoE is both an objective and a subjective metric measuring the streaming quality experience by end users. It may be measured by streaming bitrate, playback smoothness, video quality metrics like Peak to Signal Noise Ratio, and other user satisfaction factors. There have been efforts made to improve the streaming experiences in all these aspects. In this paper, we conducted a survey on existing literatures on QoE of video streaming to gain a deeper and more complete understanding of QoE quality metrics. The goal is to inspire new research directions in defining better QoE and improving QoE in existing and new streaming services such as adaptive streaming and 3D video streaming.     

Android系统中RTMP流媒体直播的设计与实现

在人烟稀少、边远山区和高原等地区,无线基站覆盖面较小导致无线传输通道环境恶劣,无法有效实现远程高清音视频的实时播放.前端无线手持设备多采用Android操作系统,因此Android系统高质量实时传输高清音视频成为远程视频监控的关键问题.为保证高清音视频的稳定传输,解决网络拥塞和画面延迟抖动等问题,在Android系统上采用RTMP协议传输高清音视频,优化RTMP的数据传输策略,实现了高清音视频的无线传输.在严重丢失帧的恶劣环境下测试该系统,系统运行稳定,显著提高了音视频播放的流畅性和传输的服务质量.     

水泥生产节能减排监控系统通信技术

根据水泥生产节能减排的迫切需要构建了多媒体移动信息网络,对水泥生产中能源消耗和污染物排放的关键部位进行长期连续信息采集,用对称高速数字用户线路（SHDSL）、短距离无线通信、光纤等方式进行企业内部数据传输,应用第三代移动通信技术（3G）建立数据远程高速传输通道,以数字、文字、图像、视频等多种形式的媒体承载信息,将网络覆盖达到全球范围,使企业技术和管理人员能够用计算机、掌上电脑和移动电话等各种终端装置随时、随地、随身获取所需要的最新信息,根据这些信息调控生产工艺。     

移动视频监控系统的设计与实现

提出一种基于3G无线网络平台实时传输MPEG-4流媒体的策略,结合移动视频监控系统,给出总体设计框图,并对嵌入式移动视频监控系统的软件设计进行了阐述.在3G网络平台上的运行表明,该系统能在带宽有限的情况下很好地工作.     

Video transmission over mobile satellite systems

Mobile satellite communication channels are characterized by long transmission delays, variation of these delays, high bit‐error‐rates, shadowing and the multipath effect which severely reduce the quality of video services. Error control techniques including feedback mechanisms, error concealment methods, forward error correction techniques and error resilience schemes are examined in this paper for achieving a high‐integrity video transmission over a mobile satellite channel. The application of three different error resilience algorithms, namely Turbo codes, error‐resilient entropy codes and two‐way decoding using reversible codes is presented. Their joint performance is also examined. Furthermore, a low‐delay and low‐complexity video transcoding algorithm which fully interconnects two very low bit rate video communication standards: MPEG‐4 and H.263 is also elaborated. This transcoder works as a gateway tool which links two heterogeneous multimedia networks, such as a mobile satellite network and a land‐based network, with negligible processing delay and complexity. Copyright © 2000 John Wiley & Sons, Ltd.