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).     

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.     

Chasing Japan in the HDTV race

The status of high-definition television (HDTV) in Japan, Europe, and the US is examined. Japan has begun experimental broadcasts, and Europe plans experimental HDTV broadcasts in 1991, while the US is mired in disputes over just how important HDTV might be to its deteriorating consumer electronics industry. Delays in selecting a terrestrial broadcasting transmission standard for the US suggest 1993 as the earliest possible date for the start of HDTV broadcasting in the United States and 1995 as a more probable date. Problems and approaches in the US, Japan, and Europe are compared, focusing on government support and standardization     

广播电视传输覆盖技术体系的构建探讨

本文主要简单介绍了广播电视传输覆盖技术的三大系统,通过对现阶段广播电视传输覆盖技术的应用状况进行分析,来探讨构建广播电视传输覆盖技术体系的有效措施,研究广播电视传输覆盖技术的未来发展方向,以充分发挥广播电视传输覆盖技术,提高广播电视传输覆盖技术的应用效果,使其体系更加完善,扩大广播电视信号传输的覆盖面积,让更多地区的用户能够享受广播电视服务,推动广播电视行业的可持续发展,促进人们生活娱乐水平的提升。     

高级数字电视广播系统传输方案

作为高清晰度电视总体组在数字电视传输技术研究方面的组成部分，介绍一种由浙江大学、上海交通大学和西安电子科技大学共同提出并开发的高级数字电视广播系统（Advanced Digital Television Broadcasting System,ADTB)的传输方案。该方案在功能和性能上超越现有的国外数字电视标准，能够在使用民用级调谐器的前提下，实现大容量广播数据的稳定的无线固定、便携和移动接收，支持单频网络和同频道转发，包含高效的数字有线广播传输模式，易于兼容国外标准。这是我国数字电视广播标准理想的侯选方案之一。     

Transmission System for ISDB-T

The Association of Radio Industries and Businesses in Japan decided the specifications for a digital terrestrial broadcasting system called ISDB-T in 1998. The ISDB-T transmission system is recommended in ITU-R Recommendation BT.1306. Planning criteria of the ISDB-T system are recommended in ITU-R Recommendation BT.1368. This paper describes the transmission scheme of the ISDB-T system. First, it explains features of the ISDB-T system. Second, it describes transmission systems such as modulation, error correction, orthogonal frequency division multiplexing framing, transmission and multiplexing configuration control, guard interval, etc. Finally, it concludes discussion of the ISDB-T transmission system and describes transmission parameters used in Japan.     

An HDTV‐Compatible 3DTV Broadcasting System

We introduce a high‐definition three‐dimensional television (3DTV) broadcasting system that is fully compatible with the existing transmission system of high‐definition television (HDTV). Specifically, we developed high‐definition 3DTV broadcasting subsystems including a 3DTV camera, 3DTV video multiplexer and demultiplexer, 3DTV receiver, and 3DTV outdoor broadcast van. To verify the developed subsystems, we performed experimental services of 3DTV broadcasting during the 2002 FIFA World Cup Korea/Japan.. According to our subjective evaluation test, 88% of 273 viewers rated the perceived depth of 3DTV as “Good,” and 36% of the viewers preferred 3DTV to other digital broadcasting services.     

地面数字电视系统

近年来,广播电视领域正处在从模拟电视向数字电视转化过程中,在经历了数年的努力后,我国的数字地面电视广播传输系统国家标准已经成熟并公布。在此介绍了地面数字广播的标准,并对其系统组成进行了阐述。     

Television Broadcasting and the Wired City

Communication by broadcasting, although most effective in terms of broad area coverage at relatively low cost, is subject to reception interference which is often uncontrollable. In heavily populated urban areas these severe and changing interference problems, as well as limited electromagnetic spectrum, are inherent to the environment. Communication by wire, a point-to-point coverage independent of the electromagnetic spectrum, presents a solution to these problems. The communications engineering community is encouraged to develop transmission standards for the wired system that are compatible with broadcast transmission standards, and transmission testing for wired systems is reviewed.     

Development of Interactive Data Broadcasting System Compliant with ATSC Standards

In this paper, we present an interactive data broadcasting system compliant with the Advanced Television Systems Committee (ATSC) standards. The proposed system provides users not only with various data broadcasting services but also remote interactive services. For various data broadcasting services, we have adopted a synchronized data injector that calculates the transmission time of synchronized data accurately and multiplexes synchronized data with the data of an MPEG‐2 audiovisual program according to the calculated transmission time. To support remote interactive services, we designed and implemented a return channel server connected on a bi‐directional interaction channel. Test results show that the proposed system provides both an asynchronous and synchronized data broadcasting service and remote interactive service appropriately.     

The DVB-H Mobile Broadcast Standard

The digital video broadcasting-handheld (DVB-H) standard is one of the latest transmission standards developed by the digital video broadcasting (DVB) Project. DVB-H, which is based on the standard for digital terrestrial television (DVB-T), offers mobile television and other broadcasting services on small portable devices such as mobile phones. This article presents an overview of the DVB-H standard with respect to structure, features, technology, performance, and resources.     

数字电视地面广播技术与发展

本文系统介绍了数字电视地面广播的标准、系统、播出试验和设备以及我国在数字电视地面广播领域所做出的成绩,对数字电视地面广播做了较详细的描述和探讨.     

The Japanese scene [digital HDTV]

Japan is the only country, so far, to be actually broadcasting high-definition television services. MUSE (multiple sub-Nyquist sampling encoding) is the basis for systems applying bandwidth compression to the transmission of both analog and digital signals. It encodes a signal of 1125 lines and 60 fields per second, a high-definition television (HDTV) signal into an 8-Hz bandwidth. Experimental MUSE broadcasts started in 1990 and have continued ever since. Meanwhile, work has been in progress in areas other than MUSE. Enhanced-definition television, a terrestrial system, is entering its second generation. Integrated digital broadcasting looks to spin many services into a single digital thread for transmission over a single channel. Digital sound broadcasting and hierarchical television transmission will also come in for consideration. The MUSE system depends on digital technology for signal processing, but the HDTV signal that is broadcast is analog, the outcome of frequency modulation     

Transmission System for ISDB-S

Broadcasting satellite (BS) digital broadcasting of HDTV in Japan is laid down by the ISDB-S international standard. Since it has a unique transmission technique that can use a number of modulation schemes simultaneously in one RF carrier, the most suitable modulation scheme for the broadcast content can be selected even within one RF carrier. In addition, a hierarchical modulation technique that can mitigate rain attenuation can be introduced as an application of this transmission system. This paper shows how the transmission system establishes such a versatile function.     

Wideband speech and audio coding

Typical parameters of wideband speech and audio signals, including digitized versions of each, potential applications, and available transmission media, are described. Facts about human auditory perception that are exploited in audio coding and quality measures that play an important role in coder evaluations and designs are reviewed. Techniques for efficient coding of wideband speech and audio signals, with an emphasis on existing standards, are discussed. The audio coding standard developed by the Moving Pictures Expert Group within the International Organization for standardization (ISO/MPEG) is covered in some detail, since it will be used in many application areas, including digital storage, transmission, and broadcasting of audio-only signals and audiovisual applications such as videotelephony, videoconferencing, and TV broadcasting. Ongoing research and standardization work is outlined     

Broadcasting with digital audio

Digital audio broadcasting will come on-line worldwide in the next few years. The technology-also known as digital audio radio or digital sound broadcasting-promises to provide sound of compact-disk quality, nearly free from multipath distortion or other transmission interferences. And digital audio broadcasting (DAB) is not just for sound: all sorts of information, digitally encoded, will be transmitted. Testing is already under way around the world for systems that deliver DAB signals from satellites, from terrestrial systems using newly assigned spectral bands, and from in-band (that is, currently assigned) AM and FM systems. The author discusses spectra for DAB, perceptual coding, Europe's Eureka 147 system, and DAB research in Canada, the USA, and Japan     

数据广播的发展与思考

数据广播是第三种类型的广播。本文从分析数据广播的定义与分类出发，简要综述了调频多工数据广播的发展历史与现状，分析了它的主要作用；简要介绍了调幅多工数据广播的进展。综述了欧洲图文电视、隐蔽字幕、电传软件、收费数据广播与ＰＤＣ的发展，分析美国隐蔽字幕“２１行业务”的新进展与日本的电视传真广播的发展。最后对发展我国数据广播提出了看法与建议。     

声音广播的必由之路：数字声音广播

本文介绍声音广播的一种新形式－数字声音广播，以及世界各国在研制数字声音广播和应用领域的发展状况，根据国外的概况，对我国的数字声音广播发展提出几种可能途径，并建议通过进一步的软件、硬件试验确定我国的数字声音广播体制。     

High definition television systems

High definition television (HDTV) services will play the most important role in the digital television systems for the future. HDTV is already broadcast daily in Japan and advanced television (ATV) standards will soon be established in the US. The hardware systems for two HDTV systems, the 1125/60 and 1250/50 systems, have already been developed. Their outlines are described in the paper. Signal processing of HDTV is mainly carried out by digital methods on both the studio and receiver sides. The principles of processing are the same as for conventional television but the higher clock frequency and larger quantity of information require more sophisticated hardware. Digital signal processing methods are the key technology in HDTV broadcasting systems regardless of whether modulation is analog or digital. Some broadcasting systems are already practical use while others, are experimental. The author discusses these systems. The aim of the article is to present a global scope of the HDTV technology     

我国高清晰度电视的道路

本文回顾了日本、西欧及美国HDTV发展的背景及过程。文中提出讨论中国高清晰度电视道路的几个议题,如发展HDTV对我国电子工业及广播事业的影响;HDTV在非广播领域的应用;传输体制为地面或卫星;与现行TV制式的兼容性以及渐进或革命性地进入HDTV等等。作者提出了自己的见解。