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数字电视是从节目摄制、制作、编辑、存储、发送、传输到信号接收、处理、显示等全过程完全数字化的电视系统。数字技术和网络技术的高速发展,电视节目的采集、编辑、制作、存储、播出等全面实行了数字化建设,加快了全国广播电视数字化进程,本文将讨论数字电视广播播出系统的构成和关键技术。 相似文献
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天津电视台数字电视播出平台 总被引:1,自引:1,他引:0
天津电视台数字电视播出平台是天津市数字电视新体系的重要组成部分,由节目采集制作、节目存储和节目播出三个子系统构成。本文详细介绍了该平台总体技术方案、各子系统技术方案及对系统集成和主要设备选型的考虑,具有一定的借鉴和参考价值。 相似文献
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本文通过作者在数字电视节目平台播出系统集成、运行过程中的一些经验和体会,着重介绍了数字电视的网络化播出特点,以及采用智能化存储网络技术,形成网络化播出的工作流程。 相似文献
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本文系统阐述了金昌市城市有线数字电视系统从节目接收、存储、管理、加扰、播出以及选用CAS和OSS实现对用户管理和控制的特点。 相似文献
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辽宁电视台的数字电视节目平台从2001年11月开始总体设计,经过2年多的系统建设,现已达到对上(全国)对下(全省)连续播出任意节目流保护的10支TS流(网络备份),40套以上的自办视频节目和88套自办音频节目的系统能力。实现后台一级播出存储节目量800小时以上,日加工编辑节目能力150小时以上,中心存储并管理节目2800O小时,并可对近线存储平滑扩充至100000小时以上的综合节目平台。 相似文献
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重点介绍了天津数字电视节目平台(基于TS流的节目采集,码流编辑,媒资存储,硬盘播出)中的关键部分——基于ASI和DVB硬盘播出系统。该系统具有多路直播功能,能在TS流中直接“键控”台标,实现了节目的无缝切换和基于媒资的节目上载,具有极高的性价比,基本代表了DVB硬盘播出的方向。 相似文献
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对当前非线性编辑与数字电视节目播出之间存在的问题进行分析,提出针对非线性编辑设备产生的数据进入数字电视节目播出系统的方案和设想. 相似文献
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对当前非线性编辑与数字电视节目播出之间存在的问题进行分析,提出针对非线性编辑设备产生的数据进入数字电视节目播出系统的方案和设想. 相似文献
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从拍摄、编辑、传输到终端显示的各个环节,3DTV技术已趋于成熟。首先介绍了3DTV的基本成像过程,然后给出了景物出屏的基本原理及影响出屏距离的若干因素,最后重点介绍了基于空间复用的时分翻页式立体显示技术的工作原理与特点。 相似文献
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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. 相似文献
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一种数字电视条件接收系统的设计与实现 总被引:2,自引:2,他引:0
为支撑业务的安全开展,有线数字电视系统需提供一个安全可靠的加密系统,即条件接收系统。条件接收系统是对数字电视节目进行加密,以实现有线电视运营商对用户进行管理和收费。本文介绍了一种数字电视系统中的条件接收系统实现方案。 相似文献
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县级电视台作为广电系统的重要组成部分,其有线数字电视的推广对整体的数字电视建设具有重要意义。但是由于技术力量和经济实力的差别,县级电视台的有线数字电视建设不可能照搬大型电视台的模式,必须从各自的具体条件出发,找出合适的建设方案。介绍有线数字电视技术推广普及的背景,阐述有线数字电视的技术原理,以县级电视台的实际情况为基础,说明县级电视台建设有线数字电视的必要性。 相似文献
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Overview of Digital Television Development Worldwide 总被引:2,自引:0,他引:2
Wu Y. Hirakawa S. Reimers U.H. Whitaker J. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2006,94(1):8-21
This special issue of the proceedings of the IEEE presents a systematical and complete tutorial on digital television (DTV), produced by a team of DTV experts worldwide. This introductory paper puts the current DTV systems into perspective and explains the historical background and different evolution paths that each system took. The main focus is on terrestrial DTV systems, but satellite and cable DTV are also covered,as well as several other emerging services. 相似文献
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This paper proposes a new broadcasting system for the service‐compatible 3DTV in which the 3D service can coexist with the conventional digital TV broadcast. In the proposed system, the commercial 3DTV service can be implemented via the existing DTV channel without utilizing the dedicated 3DTV system. This 2D/3D system interworks with the conventional system and can switch to 2D or 3D service according to the broadcast programming and schedule. The system also provides a mechanism that can prevent the synchronization mismatch between left and right video streams and between the stream and the associated signaling in the 2D/3D transition periods. The picture quality measurements are carried out based on the ITU‐R recommended test to check the level of quality of service provided by the proposed scheme. The conformity tests are also performed with the conventional channel and the receiver for the DTV system to confirm the feasibility of the proposed one for the commercial service. 相似文献
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A transmitter identification system for DTV distributed transmission network using embedded pseudo random sequences is investigated. Different orthogonal pseudo random sequences and their suitability for transmitter identification are discussed. Code generators are developed to study the auto-correlation and cross-correlation properties of the Kasami sequences. To speed up the identification process, the embedded pseudo random sequence is preferred to be time-synchronized with the DTV frame structure. Therefore, the length of the identification code has to be truncated before it is fitted into each field of the ATSC DTV signal. The impact of truncation noise and in-band DTV interference on transmitter identification is also investigated. It is shown that the auto-correlation and cross-correlation properties are only slightly affected by truncation. It is also found that the dominant interference to the transmitter identification is the in-band DTV signal. The signal to truncation noise ratio and signal to DTV interference ratio in the correlation output are derived, and verified via simulation. It is further recognized that in-band DTV interference can only be mitigated by increasing the code length or by time-domain averaging technique to smoothen out the in-band interference. 相似文献