Hierarchical NTSC compatible HDTV system architecture — A North American perspective

High definition television (HDTV) has become a major world-wide event in the television arena. Since the early 1980s, when HDTV was first demonstrated by Japan, a number of alternative systems have emerged. These systems clearly reflect the business and political objectives of the particular countries or organizations. In North America, which is the largest single consumer market in the world, technical, business and political considerations are shaping the evolution of HDTV. This paper describes a possible advanced television (ATV) architecture for North America and defines its functional modules and corresponding interfaces. The developed model is recommended as a design tool for standardizing ATV in North America and analysing interrelationships of the functional modules on the economic basis. The paper proposes an ‘hierarchical’ ATV emission system with full NTSC compatibility and HDTV quality. Solutions are recommended for terrestrial broadcast, CATV and satellite. This work describes a total systems approach to HDTV called HDS-NA (high definition system for North America). The two emission signals of HDS-NA: HDMAC-60 and HDNTSC are characterized. RF alternatives for the terrestrial broadcast of HDTV are also discussed.     

HDTV communication systems in broadband communication networks

Two high-definition television (HDTV) communication systems created for broadband communication networks are discussed. Nationwide HDTV transmission and distribution services and HDTV subscriber distribution services are examined. A network architecture for high-quality HDTV transmission is described. The transmission bit rates of HDTV services, which are the basic factors in constructing the network frame, are considered. Two HDTV coding algorithms, subband discrete cosine transform (DCT) and subband differential pulse-code modulation (DPCM) are described, and their coding bit rates discussed. A synchronous-digital-hierarchy-based synchronous transfer mode network design suitable for the transmission of HDTV signals in broadband communication networks are described     

Flexible and robust packet transport for digital HDTV

The packet-oriented transport approach used in the advanced digital television (ADTV) system for terrestrial HDTV broadcast is described. ADTV achieves robust HDTV delivery on terrestrial simulcast channels via MPEG video compression, prioritization of MPEG data, and `cell-relay' type packet transport in conjunction with a two-tier physical transmission scheme. General design issues relevant to the development of the proposed transport protocol are discussed. ADTV's prioritization algorithm for partitioning MPEG-encoded video into high-priority (HP) and standard-priority (SP) bit streams is outlined. The data transport format supporting these prioritized compressed video bit streams is described. The three principal sublayers of the ADTV transport protocol are discussed in terms of specific functions, impact of system performance, and hardware implementation factors. A proof-of-concept simulation model that incorporates transport encoding and decoding functionality is outlined, and performance evaluation results are given for illustrative transmission scenarios     

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     

HDTV displays in Japan: projection-CRT systems on top

The status of high-definition television (HDTV) displays for industry and the home in Japan is discussed. Key requirements for HDTV displays are examined. Improvements in projection cathode-ray tubes (CRTs), presently the sole display candidate for home HDTV displays in Japan, are described     

HDTV broadcasting systems

A brief overview of HDTV broadcasting in the USA, Japan, and Europe is given. The requirements for HDTV broadcast systems are examined. The issue of compatibility is discussed. Standardization activities for HDTV broadcasting are described. The Japanese MUSE (multiple sub-Nyquist sampling encoding) system and the European HD-MAC (high-definition multiplexed analog components) systems are examined with respect to their technical basis, underlying principle, and coding/decoding     

Transmission of all-digital advanced television: state of the artand future directions

All-digital high definition television (HDTV) and advanced television (ATV) systems have been proposed in the United States and Europe for terrestrial as well as satellite broadcasting. The main goals of the paper are to describe and discuss the theory and methods for error control, modulation and equalization used by these HDTV and ATV systems. The author identifies their similarities and differences in their error control, modulation and equalization methods and discusses possible improvements to them. He also describes recent research directions and trends in error control which pays much more attention to advanced and relatively new theory and techniques in information, coding, and communication theory. Finally, his views are provided, based on the above, about the best choices for error control schemes. The specific HDTV and ATV systems which have been proposed and, in most cases, built and tested in various ways, are described     

High-definition television update

Developments in high-definition television (HDTV) in the US, Europe, and Japan are reviewed. The Japanese direct-broadcast-satellite HDTV system is described, and its advantages and drawbacks are examined. European activity is briefly described. The FCC enquiry into HDTV in the US is discussed. The focus is on the issues of standards and compatibility     

HDTV传输的调制技术

本文旨在阐述高清晰度电视（ＨＤＴＶ）传输的调制技术，并对其国际现状作一较全面的概括。文中扼要地分析了ＨＤＴＶ传输的基本原理，在突出全数字式地面广播的情况下，简述了三种传输调制技术的思想和特点，最后，比较三种ＨＤＴＶ传输的调制技术并分析它们的发展趋势。     

Extending HDTV coverage using low power repeaters-a cellularapproach

An HDTV broadcasting system that uses low-power repeaters arranged in a cellular fashion to extend the service area of a primary advanced TV (ATV) system is described. Examples of ATV extended coverage contours based on DigiCipher high-definition TV (HDTV) measured performance parameters and Federal Communications Commission (FCC) propagation tables are presented     

Modulation for terrestrial broadcasting of digital HDTV

The digital modulation methods used by the DigiCipher, DSC-HDTV, ADTV, and ATVA-P digital high-definition television (HDTV) systems are discussed. Three of the systems use a quadrature amplitude modulation method and the fourth uses a vestigial sideband modulation method. The channel equalization and spectrum sharing of the digital HDTV systems is discussed     

European perspectives on HDTV studio production standards

The European standardization effort with respect to high-definition television (HDTV) is examined, focusing on production standards. The value of single worldwide HDTV standards is discussed, and a series of multinational research and development projects underway in Europe under the general title `Eureka' is briefly described. Candidates for the worldwide standard are reviewed, and the difficulties of achieving a single standard are considered. The influence of economic and operational factors on the choice is examined. Dual-mode reception and colorimetry are discussed     

全数字HDTV的图像质量

本文从图像压缩编码的角度，讨论不同全数字ＨＤＴＶ方案的图像质量，从讨论结果中可以看出：经过编码／解码后全数字ＨＤＴＶ的重建图像质量，将接近或非常接近ＣＣＩＲ７０９建议的演播室图像质量。     

Digital HDTV compression techniques

The roles that digital high-definition television (HDTV) compression techniques play in HDTV applications, such as digital HDTV terrestrial broadcasting, are discussed. Images can be encoded intraframe and/or interframe, depending on the requirement of compression rate and the picture quality. Using source coding, redundancy in the spatial and temporal domains can be greatly reduced while preserving the level of image quality required for the given application     

Source coding, channel coding and modulation techniques used in theDigiCipher system

The DigiCipher high-definition television (HDTV) system, an all-digital approach that achieves full HDTV performance with error-free reception in a single 6-MHz television channel is described. The DigiCipher HDTV system is based on discrete cosine transform coding and uses motion prediction techniques to eliminate redundancy in the digital signal, channel equalization to defeat multipath, and error correction to defeat noise and interference. The source signal, source coding, channel coding, modulation, and performance of the system are discussed     

地面数字HDTV的频率规划和信道编码

本文研究地面数字ＨＤＴＶ的频率规划，提出ＨＤＴＶ服务面积的一种近似计算方法，阐述了ＨＤＴＶ两种传输方案中必须解决的关键技术，提出了ＨＤＴＶ应用的级连码设计原则，探讨ＨＤＴＶ的系统结构，对发展我国数字ＨＤＴＶ提出参考意见。     

HDTV的关键技术

本文讨论高清晰度电视（ＨＤＴＶ）体制的关键技术。本文分析表明，ＨＤＴＶ的关键技术主要包括信源压缩编码、信道编码技术及传输调制技术，而传输调制方式则是ＨＤＴＶ体制的核心内容。     

数字HDTV地面广播传输方法第四讲 自适应均衡技术

本文介绍用于地面传输全数字式高清晰度电视（ＨＤＴＶ）中的自适应均衡器。着重介绍采用最小均方算法的横向滤波器、判决反馈均衡器及盲均衡器，讨论了ＨＤＴＶ中采用的不同均衡方案及其均衡性能。     

HDTV发展近况与研究对策

本文重点介绍了自美国推出HDTV数字制式以来,国际上美、日、欧角逐HDTV的发展近况,并探讨了我国的研究对策。