应用于数字HDTV的投影技术

为了获得良好的视觉效果,数字HDTV要求大屏幕的平板显示器件,投影技术能满足HDTV的大屏幕、纯平面和薄型的显示要求而成为HDTV的一种显示技术.详细介绍了应用于数字HDTV的投影技术.     

我国高清晰度电视(HDTV)的制式选定策略分析

本文在分析了国际上HDTV发展历史、HDTV技术要求和我国国情的基础上,提出了我国选定HDTV制式的依据。     

HDTV用宽屏幕大型管技术动态

研究了HDTV显示格式对彩管的技术要求，分析了市场上正在推广的技术相对成熟的HDTV用彩管的性能，明确了HDTV对彩管性能的综合技术要求。     

高清晰度电视显示技术的发展

介绍了HDTV图像标准及其对显示设备的要求，解释了HDTV显示图像的混叠率及极限清晰度概念，分析了当今HDTV显示设备的发展现状，预测了HDTV显示设备的近期发展。     

高清晰度电视声系统

本文主要针对目前国际上正在研究的高清晰度电视(HDTV)声系统的最新研究成果,介绍了HDTV声系统的基本要求、声系统方案、主观评价试验和HDTV声系统今后研究方向。     

PDP在HDTV中的应用及其存在的问题

分析HDTV对显示器的性能要求以及PDP的显示原理和技术特点,指出了PDP显示器用作HDTV显示器需要解决的问题。     

数字高清电视携手等离子显示技术发展

1964年以来，HDTV一直作为下一代主要的电视系统进行研究和开发。HDTV要求高清晰度、高画质和大屏幕平板显示。数字高清电视和平板电视正在创造一个巨大的新市场。本文将描述HDTV显示的基本要求、PDP的性能以及PDP电视的信号处理和驱动的结构。同时论述了进一步改善图像质量的发展方向。     

CRT在HDTV时代的地位与发展

今年8月31日,杭州成为我国第一个播送HDTV的城市,播送格式为1920×1080I,50HZ,采用DVB-S方式传送,通过位于东经122度的“亚洲4号”卫星,C波段转发器播出。现场演示采用了HDTV机顶盒和127cm(50”)以上的HDTV显示器,图像质量受到与会者的普遍好评。据悉,中央电视台计划年底以前在15个左右城市陆续播出HDTV节目。另外,2008年北京奥运会将是奥运会历史上第一次全部采用HDTV标准制作传输电视节目。消费者用什么样的显示器接收高清信号比较好呢?传统的CRT电视能满足HDTV的要求吗?是否只有平板电视才叫数字电视?高端电视是怎么回事?像素多就是HDTV吗?面对市场上琳琅满目的,形形色色的高清电视,用户怎样才能作到明明白白消费HDTV呢?下面谈谈作者的意见,供参考。     

完全再现HDTV画质的投影机:QUALIA Q004-R1--体验索尼SXRD的魔力

“再现HDTV画质”是近期在媒体上经常能见到的字样，随着高清晰度数字电视这一概念的逐渐形成，它开始被提上了议事日程。那么，除了我们所熟知的HDTV电视机／等离子显示器之外，还有什么显示器材是能够达到HDTV画质要求的呢?正逐步为影音发烧友所注意的投影机中是否就有对应的机型呢?     

彩电发展新动向

人们对彩电清晰度的要求是无止境的,于是产生倍场、逐行扫描等技术以满足消费者日益渐高的要求,HDTV的出现,则是要从根本上改变电视画面的质量。虽然HDTV还未普及,但模拟电视已逐渐向其靠拢:随着SONY的DRC、日立的CDR、长虹的8倍精显等技术出现,电视机扫描系统,不正向HDTV的480p、1080ⅰ扫描制式统一吗?PDVD以及搭载Progressive CCD(逐行扫描CCD)的DV摄像机,还有可以将隔行扫描的TV节目及其它视频信号源变成逐行扫描的倍线器的出现,又使人们可以在具有该功能的模拟电视上先睹为快。逐行扫描的出现,使模拟电视又向HDTV跨进了一步。但     

Real-time video decoding scheme for HDTV set-top boxes

We present a scheme for real-time digital HDTV video decoding suitable for DVB or ATSC set-top boxes. Our technique is based on a dual decoding datapath controlled in two fixed-scheduling combinations with an efficient memory interface scheme for anchor pictures. Unlike other decoding approaches such as the slice bar decoding method and the crossing-divided method, our scheme reduces memory access contention problem to achieve real-time HDTV decoding without a high cost in overall decoder buffers, architecture, and bus. Our simulation shows that with a relatively low rate 81 MHz clock, our decoder can decode MPEG-2 MP@HL HDTV in real-time, based on a video format of 1920 /spl times/ 1080 pixels/frame at 30 frames/s, at a bit rate of 18-22 Mbps.     

Designing a multiuser HDTV storage server

The authors present a quantitative study of designing a multiuser HDTV server, and they present efficient techniques for storing multiple HDTV videos on disk and servicing multiple subscriber requests simultaneously, both under the constraint of guaranteeing HDTV playback rates. They develop a model that relates disk and device characteristics to the HDTV playback rate and derive a storage pattern for HDTV video streams that guarantees their real-time retrieval. Given multiple HDTV streams, mechanisms for merging their individual storage patterns are developed. Merging algorithms that yield a large improvement in space utilization over storing each of the streams independently are proposed. Policies such as round robin and quality proportional for servicing multiple subscribers simultaneously are studied. These studies provide a quantitative demonstration of the technological feasibility and economic viability of HDTV-on-demand servers on metropolitan area networks (MANs)     

高清视频解码中SDRAM控制器的实现

介绍SDRAM在HDTV（1920x1080）视频解码中的应用,提出了在HDTV视频解码系统中实现多模块共享存储单元的高效SDRAM控制器。通过优化控制器的状态机,读写地址合理映射,最终实现高速高效地完成实时视频解码。     

A Real-Time Video Decoder for Digital HDTV

In this paper, an architecture for real-time digital HDTV video decoding is presented. Our architecture is based on a dual decoding datapath controlled in a fixed schedule with an efficient write-back scheme for anchor pictures. The decoding datapath is synchronized at the block (8 × 8 pixels) level. Unlike other decoding approaches such as the slice bar decoding method and the cross-divide method, our scheme reduces memory access contention problem to achieve real-time HDTV decoding without a high cost in overall decoder buffers, architecture, and bus. In comparison to data-flow approaches, our method eliminates the complexity associated with tagged data operations. Our anchor picture storage is organized to minimize page-breaks during memory accesses. Simulation shows that with a relatively low rate 81 MHz clock, our decoder can decode MPEG-2 MP@HL HDTV in real-time, based on an ATSC video format of 1,920 × 1,080 pixels/frame at 30 frames/s, at a bit rate of 18 to 20 Mbps.     

HDTV中MPEG-2实时解码器的错误处理实用新算法研究

论述了国内外高清晰度数字电视中的ＭＰＥＧ－２实时解码器的错误处理的研究现状及其典型算法,提出了错误处理实用新算法的研究思路。算法研究与ＨＤＴＶ视频解码器硬件研制紧密结合,为国家重大项目－ＨＤＴＶ功能能样机研制直接提供算法支持。     

高清电视音频解码算法研究与实现

针对DVB的高清电视音频解码中的子带综合滤波算法进行了改进,使得运算量和存储量都下降了一半以上,采用改进算法的解码器在完成C语言仿真的基础上,进行了浮点程序的定点化改造,以实现基于定点DSP的实时解码,此解码器对高清电视信源解码等众多方面有着广泛的应用.     

Present status of three-dimensional television research

Television that conveys real-time information has become an indispensable part of our lives. Its technology has advanced from the days of black-and-white sets to color models and to high-definition television (HDTV). HDTV has been contrived to provide the audience with greater immediate appeal such as sensation of reality and power than the current TV system does and its worldwide applications are expected to continue to grow. Real world information which we obtain with our eyes is three-dimensional. It is reasonable therefore, that we humans want an imaging system that produces pictures that are as natural and real as things we see and experience every day. Three-dimensional television (3DTV) is a very promising approach expected to satisfy such wishes. As television technology matures and HDTV produces pictures as clear as movies, 3DTV is now capable of providing real-time stereoscopic pictures with high resolution. This paper outlines the studies that have been carried out about 3DTV as a post-HDTV system. The themes of the paper are focused to such topics as human factors in relation to binocular parallax, camera and display systems, and bandwidth reduction technology     

地面数字电视广播的双国标SDTV和HDTV

2008年起我国用地面国标(C-std)大规模启动地面数字电视广播,在8个城市实现2008北京奥运会的HDTV实况转播,但其视频编码仍然采用技术已落后的MPEG-2技术,印单国标.本文介绍双国标(C-std+AVS视频编码)SDTV和HDTV的4种技术模式,分别用以服务农村家庭和中心城市家庭.     

高清晰度电视信号用外插内插预测编码方法

本文介绍了一种高清晰度电视(HDTV)信号的数字传输用高效编码方法。由于HDTV信号的带宽宽,所以存在两个主要问题:一是HDTV信号的随机噪声比传统电视信号的大,因而导致编码的效率下降;二是需要很高的取样频率。这样,就限制了编码算法的硬件实现。因此,本文提出两种技术来解决这些问题:第一是时空自适应滤波器,用它可降低随机噪声并改善编码效率;第二是具有自适应内场/帧间预测的外插和内插编码算法,这种算法消除了因高的取样频率引起的问题并保证了高效编码性能。     

An extrapolative-interpolative prediction coding method for HDTVsignals

Techniques are introduced to solve two problems caused by the wide bandwidth of HDTV signals. One problem is that HDTV signals have more random noise than conventional TV signals, which causes coding efficiency degradation. The other is that very high sampling frequencies are required, which restricts the hardware implementation of the coding algorithm. To solve the first problem, it is proposed to use a spatio-temporal adaptive filter that can reduce random noise and improve coding efficiency. With regard to the second problem, an extrapolative and interpolative coding algorithm with adaptive intrafield/interframe prediction is presented. This algorithm eliminates the problem caused by the high sampling frequencies and provides efficient coding performance. A computer simulation is carried out to estimate the coding performance. Based on the simulation results, experimental coder hardware was implemented for 1125-line/60 Hz HDTV signals in order to evaluate real-time coding performance. The experimental results show that this coding method can provide good picture quality at around 90 or 135 Mb/s, and that HDTV digital transmission is very promising at the broadband ISDN H₄ rate