国家数字电视技术及相关产品的发展

本文首先介绍了当前国际上数字电视技术、特别、HDTV的国际标准等发展情况，详细分析了数字电视的过渡产品（机顶盒）的技术有市场动向，并介绍了数字电视的重要组成部分，MPEG-2视频编码解码技术。     

统计复用技术对MPEG-2编码地面数字电视画质的提升作用

MPEG-2视频编码的图像质量数据MPEG-2作为较早前的视频音频数字编码技术,早已广泛应用于卫星数字电视、有线数字电视、地面数字电视、视频光盘、数字电视节目制作等领域。一般说来,按照MPEG-2视频音频编码标准,所能提供的图像质量如图1对我国PAL彩色电视制式的数字电视来说,要保证图像质量达到标准清晰度(720×576)即5级图像的标准,则MPEG-2格式编码的图像码率一般需要在4~6Mbps之间。     

数字电视信源编解码技术及应用

通过对数字电视的编码和编码器结构的概述,介绍了MPEG-2视频编码系统的技术原理和关键技术,阐述了数字电视信源编解码技术、信号复用系统及调制解调的关键技术和它们在实际工作中的应用。     

H.264 SVC面向MPEG-2基本层扩展研究

为了解决数字电视机顶盒播放标清和高清视频的兼容性及传输带宽浪费问题,结合现有数字电视编码标准和H.264 SVC的基础,在考虑实际应用的情况下本文对H.264 SVC面向MPEG-2基本层扩展进行研究,设计了标准间SVC并给出了标准间SVC详细的编解码器系统架构,同时对关键性问题进行了分析并提出了相应的解决方案,具有良好的可行性,标准间SVC的设计实现了跨标准的视频播放,提高了编码效率,为视频编码技术发展和数字电视高清化普及提供了理论基础。     

AVS2视频编码标准技术特色及应用

围绕视频编码核心技术,简单介绍AVS视频编码标准发展历程,详细介绍了最新一代AVS视频编码标准——AVS2(GB/T 33475.2-2016)的核心创新技术,主要包括:灵活的预测划分方式、多假设帧间预测、优化的层次变换设计和自适应环路滤波处理技术以及面向场景视频应用AVS2提出的基于场景建模的高效预测编码技术.和第一代AVS视频编码标准相比,AVS2编码效率提升一倍以上;和同期HEVC/H.265国际标准相比,AVS2在场景视频编码方面有显著优势.另外简单介绍了AVS标准在数字电视广播等行业中的应用情况.     

发展中的数字电视

数字电视由于采用了先进的视频／音频压缩编码技术，以及先进的传输／存储技术，而具有诸多新特优长，有着远大的发展和应用前景，它终将取代现存的模拟制电视。文章介绍了数字电视所具有的特点，所采用的技术以及发展趋势     

超高清数字电视的编码与传输

近十几年来,随着广电行业的科技革新,视频编码技术与宽带通信技术都得到了很好的发展,不断提供给观众更高质量的视觉享受.从标清到高清,从高清到超高清,观众对视觉体验不断提出更高需求,在这种背景下,4K超高清电视毫无疑问已成为广电行业最热门的话题,大量新技术新产品应运而生.本文详细介绍了当前超高清数字电视的编码和传输的发展情况.     

数字化有线电视视频服务网络的设计

随着科技的进步,有线电视网络的数字化就成了我们追求的目标之一,实现有线电视网络的数字化可以更加全面开发和利用信道资源,大力推进数字电视的应用和信息产业的发展,促进电视质量的提高和丰富人民的精神、文化生活。目前数字电视广播系统的实现,关键点在于数字视频流的编码和在单向ＨＦＣ网上的实时广播。从这个角度,可以把数字电视广播分为４个系统来实现：数字电视的编码系统、数字电视的视频服务系统、数字电视的复用系统、数字电视的调制系统。数字电视的编码系统。系统主要是将模拟的视频信号数字化,并实时传输到视频服务器或…     

徐州有线3D立体高清数字电视系统设计

为了实现3D数字电视在徐州有线电视网络中的传输,分析了几种视频压缩编码方法,通过对比研究几种主流的3D编码方式,包括传统立体视频编码、基于深度信息的视频编码、多视角视频编码、基于深度信息的多视角视频编码等方式,并结合徐州有线网络的现有系统架构,设计了一种现实可行的3D立体高清数字电视系统。     

AVS数字音视频编解码标准

数字音视频编解码标准（AVS）是中国自主制订的数字电视、IPTV等音视频系统的基础性标准。AVS标准第2部分视频（AVS1-P2）属高效的第二代视频编码技术，相比于第一代标准MPEG-2。编码效率提高2—3倍，并且实现方案简洁，因此，AVS视频标准已经为IPTV，数字电视厂播等应用做好了充分的技术准备。同时，AVS标准具有专利许可方式简洁、相关标准配套的优势。这将为中国的IPTV、数字电视广播等重大信息产业应用及民族IT产业发展起到积极的推动作用。     

MPEG-2视频信号的编辑原理

MPEG-2采用帧间和帧内压缩编码,论述用硬件实现从压缩域到时域转换进行编辑,从而使数字电视从数据采集到播出都采用MPEG-2而无需格式转换.     

Research on Asynchronous Transfer of DTV Video Signal

Digital TV(DTV)video signal transmission over ATM network is emphasized on.Some important problems are introduced about TV video signals asynchronous transfer to network application client,and the idea of video transfer design is discussed.The contents mainly include the DTV video streams asynchronous transfer topology,compressed coding adopted ATM network,asynchronous transfer efficiency and some problems of DTV video transmission in ATM network.     

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.     

Analysis of frame-compatible subsampling structures for efficient 3DTV broadcast

The evolution of the television market is led by 3DTV technology, and this tendency can accelerate during the next years according to expert forecasts. However, 3DTV delivery by broadcast networks is not currently developed enough, and acts as a bottleneck for the complete deployment of the technology. Thus, increasing interest is dedicated to stereo 3DTV formats compatible with current HDTV video equipment and infrastructure, as they may greatly encourage 3D acceptance. In this paper, different subsampling schemes for HDTV compatible transmission of both progressive and interlaced stereo 3DTV are studied and compared. The frequency characteristics and preserved frequency content of each scheme are analyzed, and a simple interpolation filter is specially designed. Finally, the advantages and disadvantages of the different schemes and filters are evaluated through quality testing on several progressive and interlaced video sequences.     

Repetitive Delivery Scheme for Left and Right Views in Service‐Compatible 3D Video Service

This paper introduces a novel repetitive delivery scheme for the left and right views in service‐compatible (SC) 3D video that provides full backward compatibility to a legacy DTV system while retaining HD 3D visual quality without additional bandwidth or a codec over the legacy broadcasting channel. The proposed SC delivery scheme transmits individual view sequences of a 3D video in interlaced form, that is, a left‐view sequence of a 3DTV program to be used repeatedly is transmitted first and stored locally, and the right‐view sequence of the 3D program is then transmitted. This paper specifically describes the signaling, synchronization, and storage format methods used to validate the proposed SC delivery scheme. The experiment results show that the proposed SC delivery scheme can be effectively applied for an SC 3DTV service without degrading the DTV quality using only legacy DTV platforms.     

ATSC Video and Audio Coding

In recent decades, digital video and audio coding technologies have helped revolutionize the ways we create, deliver, and consume audiovisual content. This is exemplified by digital television (DTV), which is emerging as a captivating new program and data broadcasting service. This paper provides an overview of the video and audio coding subsystems of the Advanced Television Systems Committee (ATSC) DTV standard. We first review the motivation for data compression in digital broadcasting. The MPEG-2 video and AC-3 audio compression algorithms are described, with emphasis on basic concepts, system features, and coding performance. Next-generation video and audio codecs currently under consideration for advanced services are also presented.     

数字电视视频信号参数研究

计算了数字电视系统部分视频信号参数,对所列参数的计算、选取以及彼此间的关系等进行了简要的说明.这些分析对研制数字电视信号源和生产数字电视终端设备意义重大.     

Adaptive Pre‐/Post‐Filters for NRT‐Based Stereoscopic Video Coding

Non‐real‐time delivery of stereoscopic video has been considered as a service scenario for 3DTV to overcome the limited bandwidth in the terrestrial digital television system. A hybrid codec combining MPEG‐2 and H.264/AVC has been suggested for the compression of stereoscopic video for 3DTV. In this paper, we propose a stereoscopic video coding scheme using adaptive pre‐/post‐filters (APPF) to improve the quality of 3D video while retaining compatibility with legacy video coding standards. The APPF are applied adaptively to blocks of various sizes determined by the macroblock coding mode and reference frame index. Experiment results show that the proposed method achieves up to 24.86% bit rate savings relative to a hybrid codec of MPEG‐2 and H.264/AVC including the inter‐view prediction.     

EPG在数字电视中的应用

电视传输数字化,多种业务可以混合在一起通过一个信道传输,因此数字电视不再是单一的电视业务,而是通过电视传输通道传输的数字业务,包括视频、音频、图像、数据等,EPG(电子节目指南)系统是数字电视中必不可少的工具。