8K超高清电视广播的大容量无线传输技术综述

NHK科技实验室在2014年1月的8K超高清地面电视广播传输试验中实现了以超高频谱效率(约16.5 bit/(s·Hz))远距离(约27 km)传输8K超高清电视节目,取得该巨大成功的关键在于其正在研发的用于下一代地面数字电视广播系统的大容量无线传输技术。对其中的大容量无线传输技术进行综述性介绍。     

8K超高清电视广播的大容量无线传输技术

8K是迄今最接近人眼真实视觉的超高清视频技术,是现行超高清晰度电视标准中的顶级规格。超清电视广播不仅在像素数量上远超高清电视,其他性能也有非常大的提升,例如色域范围扩大、色彩还原能力更强、亮度动态范围增加、高反差景物重现能力提高等。但人们对此并不太理解,因此文章分析了8K超高清电视广播的大容量无线传输技术,便于人们理解。     

数字电视无线传输技术的发展

展望了21世纪头10年信息技术的发展，介绍了国外数字电视无线地面传输系统、数字电视／多媒体地面传输系统（DMB－T系统）和高空平台信息系统，分析了数字电视无线传输技术的发展现状和存在的问题。     

基于自适应调制编码的IP微波技术

IP微波技术是一种全新的传输技术,它将IP技术运用到微波领域中传输数据信号,具有部署速率快、安装灵活、转运方便、传输数据高效等优势,成为我国常用的地面大容量无线传输系统。提出了一种微波传输的环境模型并对其进行了说明和讨论,该模型使用IP网络作为回传,有助于开发无线接入系统的通用网络。对超高频波段微波/互联网协议（IP）转换网络接口进行了原型设计,并对转换网络接口的三大功能模块进行了详细说明,实现了数字宽带综合业务的单向传输,并对地面传输信号（DTMB）进行了演示。结果表明,地面传输信号（DTMB）可以在IP网络上高效传输,并且间歇传送用于监测/观测应用的截断微波信号会显著降低网络所需的吞吐量。     

广电节目传输中心多业务光传送网络的建设

为了适应新时代广播电视卫星信号源安全可靠传输工作要求,满足高清、4K、8K超高清等大容量电视信号传输需要,中央广播电视塔节目传输中心建设了多业务光传送网络（MS-OTN）。本文主要介绍了节目传输中心MS-OTN的组网方案,该方案应用统一线卡技术实现多种速率和类型信号的接入,以及业务级的网络自愈方式。网络建设完成后的验收测试结果符合国家和行业相关标准。     

令人惊叹的无线传输能力轻松实现大屏影音娱乐BenQ(明基)W1075

多元化无疑是当前家用投影机发展的主旋律,一方面中高端的家庭影院投影机不断通过4K超高清、LED与激光固态光源来使到画面的细节与色彩更上一层楼;另一方面,为了令投影系统的构建与使用变得更加简单,突破环境的限制,超短焦投影与无线高清传输技术取得了突破性的进展.明基是最早将高清无线传输技术融入家庭娱乐投影机的品牌,而最新推出的W1075更可以通过外置的WFHD高清无线传输模块实现30米的超距离传输,突破了传输空间上的局限性.     

NHK完成8K超高清电视长距离无线传输试验

NHK已成功完成8K超高清电视的长距离（约27km）传输试验。此次试验采用UHF频段的第46频道（频宽为6MHz）来传输经过压缩及信道编码等处理的8K超高清电视信号，通过NHK在熊本县人吉市的人吉电视中转站发射．所传输的最远距离与现有／传统全高清地面数字电视广播的相同——约27km。     

苏州有线网络8K超高清传输覆盖技术探索

本文以在苏州成功落地的8K超高清示范项目为例,从传输覆盖方面探索在现有的有线网络架构下实现对8K超高清播出经济而有效的支持,验证通过DVB信道捆绑方式实现8K传输的服务质量保障能力,以进一步推进8K技术在有线网络的落地.     

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。     

新产品+黑科技索尼携诸多前沿概念参展BIRTV2016

索尼此次展台包含北京国际展览中心8号馆及1号馆两个区域.8号馆索尼展台面积约650平米,汇聚展出索尼4K摄影机家族、现场制作流程、后期制作、IP及无线解决方案及高清前端采集等不同层次的产品和应用.1号馆索尼展台面积约60平米,展出索尼自主研发的最新的应用于电影院线的荧光体激光放映机;并展示了TMS影院排片管理系统和索尼中国本地实用化NOC系统.1号馆的ODS(Other Digital Stuff)实况电影和MiTENE AR系统也备受瞩目.现场还将用无线传输技术将8号馆的现场4K摄像机信号通过4G LTE无线网络直接传输给1号馆,使用4K激光放映机实时投放在银幕上,从而实现现场信号的异地实时传输.     

High-definition television systems

Fifteen years ago, in 1970, the NHK (the Japan Broadcasting Corporation) forecast today's information society and started research and development of a high-resolution and wide-screen television system which we now call high-definition television (HDTV) system, to produce a new television system most suitable to the creation of "video culture of the future." Wide ranging studies have been carried out by NHK on the establishment of desirable picture quality, picture aspect, and signal standards for transmission. The provisional HDTV system proposed by NHK based on the result of many studies and the performances of the system are described. Early in 1984, the MUSE system has been developed by NHK and the desirable HDTV information can be compressed with 8 MHz and packed with this system. Thanks to the development of the MUSE system, there is the potential of HDTV broadcasting via satellite and early introduction of HDTV into package media such as video discs and videotapes. The NHK's HDTV system was designed to match many other applications. Many kinds of HDTV equipment have been developed in Japan and HDTV is approached and studied in the relation to various aspects such as electrocinematography, printing, and medicine. NHK has been working on the development of the entire broadcasting system of HDTV to unite the whole world into one "television community" in the coming generation by a worldwide single standard. Video engineers all over the world should be aware of the importance of every possible effort toward the establishment of a global HDTV system.     

Present Status of Multichannel-Sound Television Broadcasting in Japan

Since October 1978, the NHK and several commercial broadcasters have introduced operational service of bilingual and stereophonic television programs to Tokyo, Osaka and other major areas, using the FM-FM multiplexing system developed by the NHK Technical Research Laboratories.     

Experience on operating a DBS system (BS-2) in Japan

In Japan, the direct broadcasting satellites BS-2a and BS-2b were launched in 1984 and 1986, respectively by NASDA (National Space Development Agency of Japan). Using the BS-2s, NHK (Japan Broadcasting Corporation) is gaining experience with direct broadcasting satellite service including high-definition TV coverage of the Seoul Olympics in 1988. The second generation satellite, BS-3a, is planned for launch in the summer of 1990. The authors discuss their four years of experience with operating satellite broadcasting carried out by NHK in collaboration with TSCJ (Telecommunication Satellite Corporation of Japan) and NASDA. Future plans are also outlined     

High-Definition Wide-Screen Television System for the Future -Present State of the Study of HD-TV Systems in Japan -

The Japan Broadcasting Corporation (NHK) started research into a future high-definition television system about ten years ago and is now taking the initiative in constructing such a system. Wide ranging studies, from desirable picture quality and television standards to broadcasting systems, development of new equipment from high-resolution cameras to wide screen displays, and transmission tests using this equipment, have been carried out. The present state of these studies and the development of the equipment are described.     

DARC系统及其应用

调频多工数据广播是近年来国际上发展非常迅速的一项业务。本文较详细地介绍了日本广播协会（ＮＨＫ）研究开发的高速无线数据广播系统－－ＤＡＲＣ系统，并对该系统的实现和应用作了深入阐述。     

22.2声道环绕声系统的测试及运用

22.2声道环绕声系统由NHK科学与技术研究实验室开发,用于超高清电视(UHDTV)系统中.介绍了22.2声道环绕声系统方案,并阐述了它的优点,以及实际运用的情况.     

Transmission System for the Television Broadcasting Satellite

Standardization of transmission system for television satellite broadcasting with multiple sound and/or data signals for an operational broadcasting satellite system is under study in Japan. Based upon result obtained from the BSE experiment, several transmission systems have been developed at the NHK (Japan Broadcasting Corporation).     

Simultaneous occurrence probabilities of rainfall among nine locations in Japan

Observation of rainfall has been performed at nine sites in Japan by NHK (Nippon Hoso Kyokai, i.e. Japan Broadcasting Corporation) during the BSE (Japan's medium-scale broadcasting satellite for experimental purposes) experimental period (1978?1981). The simultaneous occurrence probabilities of rainfall were obtained for 36 pairs of combinations among nine distant locations in Japan, and showed a clear dependence on the separation distances. It is found that this dependence of simultaneous rainfall probabilities on the separation distances is much larger than that of Italy.     

Image compositing based on virtual cameras

The virtual camera method presented integrates computer graphics and real-time video processing techniques in a new type of virtual studio. At NHK we developed several image compositing systems based on this method. First we look at the virtual camera method, then some of the systems developed with it. Then we discuss future directions and possibilities not only for image compositing but also for the development of sophisticated systems for editing and producing television programs     

New chroma-key imagining technique with Hi-Vision background

An image synthesizing technique called Synthevision is described. In this approach to image synthesis, a line NTSC camera foreground picture is synchronously keyed into a background picture which is digitally processed from a wide Hi-Vision image. This background-derived picture is controlled by a computer using data from the foreground camera. If the camera image is altered by actions of zooming, panning, and focusing, the background picture is altered accordingly through the use of a newly developed digital image processor. The combined image thus exhibits a far greater realism than conventional chroma-key imaging. Synthevision is currently used at NHK for the evening news to change the background for each segment