数字电视

在数字技术高速发展的今天,对我们来说,数字电视（ＤＴＶ）不再是个陌生的词。但呼之欲出的数字电视到底是个什么东西,它有什么特点,它与ＨＤＴＶ、ＳＤＴＶ有什么区别？它的发展到底怎样？１　数字电视和ＨＤＴＶ、ＳＤＴＶ数字电视（ＤＴＶ）、ＳＤＴＶ、ＨＤＴＶ是广播电视界时常提及的三个名词,它们之间既有联系,也有区别。ＨＤＴＶ（ＨｉｇｈＤｅｆｉｎｉｔｉｏｎＴＶ）起源于日本,是高清晰度电视的缩写,代表高质量图像和杜比数字环绕立体声。ＣＣＩＲ（国际无线电咨询委员会,现改名为ＩＴＵ）的８０１报告中为ＨＤＴＶ规定…     

新型录像机故障维修讲座第二十一讲音频录放电路的维修

新型录像机故障维修讲座──第二十一讲　音频录放电路的维修王德沅本讲以日立ＶＴ－４２６Ｅ（ＤＨ）、４２７Ｅ（ＤＨ）和ＶＴ－Ｍ７４７Ｅ（ＤＨ）型录像机为例，介绍音频录放电路的简要工作原理及故障维修要领。这几种录像机的音频电路与大多数流行家用录像机一样。是...     

地面同播数字HDTV的规划参数分析

本文对地面同播数字高清晰度电视（ＨＤＴＶ）的规划参数的合理选择进行分析，讨论ＨＤＴＶ的服务面积与Ｄ／Ｕ比（常规电视／ＨＤＴＶ或ＨＤＴＶ／ＨＤＴＶ同频道设置）、阈值信噪比之间的关系。     

HA893(V)P/TSDL电话机免提通话电路分析及常见故障修理

ＨＡ８９３（Ｖ）Ｐ／ＴＳＤＬ电话机免提通话电路分析及常见故障修理廖惜春ＨＡ８９３（Ｖ）Ｐ／ＴＳＤＬ电话机是一种性能较好的多功能按键式电子电话机。该话机通话电路有手柄通活和兔提通话两部分。手柄通话电路以ＧＦ１０６２为核心，免提通话电路如图１所示。一、发...     

高清晰度电视及其标准化动向

概述了高清晰度电视（ＨＤＴＶ）的技术特点；介绍了日、欧、美研制、开发ＨＤＴＶ制式和技术的发展和演变以及国际标准化的发展趋势；并介绍了我国ＨＤＴＶ工程综合标准体系的框架和开发工作的原则。     

产品信息

泰克公司交付首批ＨＤＴＶ草谷路由器泰克公司（ＴＥＫ）１９９８年９月２日宣布交付了小型和大型两种ＨＤＴＶ路由器产品，即ＰｅｒｆｏｒｍｅｒＨＤ和７０００ＨＤ系列路由器。这些产品的特点是采用了许多先进技术，使它们能够迅速可靠地选择全带宽ＨＤＴＶ信号的路径。...     

日立VHS录象机型号中英文含意

日立ＶＨＳ录象机型号中英文含意自ＶＨＳ录象机商品化以来，日立公司先后生产了ＶＴ－３４０、ＶＴ－１３６、ＶＴ－６６０、ＶＴ－４２６、ＶＴ－４２７、ＶＴ－５４７、ＶＴ－Ｍ７４７、ＶＴ－Ｍ７４８、ＶＴ－Ｍ７５７Ｅ（ＧＫ）／（ＤＨ）／（ＤＳ）、ＶＴ－Ｆ７８８...     

高清晰度电视及其标准化动向

概述了高清晰度电视（ＮＤＴＶ）的技术特点；介绍了日、欧、美研制、开发ＨＤＴＶ制式和技术的发展和演变以及国际标准化的发展趋势；并介绍了我国ＨＤＴＶ工程综合标准体系的框架和开展工作的原则。     

有线电视基础知识讲座第十一讲数字电视（下）

有线电视基础知识讲座第十一讲数字电视（下）□刘修文（湖南攸县有线电视台４１２３００）４全数字化ＨＤＴＶ图像压缩编码高清晰度电视（ＨＤＴＶ）的发展已有２０多年的历史，从１９９０年６月美国通用仪器公司（ＧＩ公司）公布了全数字化的ＨＤＴＶ制式以后，掀起了Ｈ...     

广播电视新技术

建设信息高速公路是新技术发展的热门话题，它融通信、广播电视、计算机数据传输于一体，向“高速、交互、智能”的方向发展。下面对新技术发展概况加以介绍。１高清晰度电视（ＨＤＴＶ）１．１ＨＤＴＶ的特点（１）与常规电视相比，ＨＤＴＶ图像水平和垂直分解力都提高了...     

视频格式转换用测试信号图

本文重点分析、研究了目前常用的数字视频信号发生器提供的串行数字分量测试信号存在不能有效用于含信号格式转换的视频处理系统客观视频指标测量的根源,并在此基础上提出了解决问题的思路和实现的方法,以及制作出一种适用于高、标清电视上、下变换系统客观视频指标测量的测试信号图及其提供的测试信号。     

基于HQV Vida处理器的HDTV图像质量改善

通过高清电视接收机收看互联网等视频信号时,由于带宽等的限制,大多数视频内容是高压缩的,图像信号含有大量噪声,当在HDTV大屏幕显示器上观看时,压缩失真随处可见。为解决这一问题,可采用具有自动HQV和HQVStreamClean两项新技术的HQV Vida处理器对图像信号进行降噪处理,HQV Vida处理器能够自动提高视频图像的质量,提供强大的源视频清理功能,消除噪声,有利于呈现尽可能清晰、干净的图像,可以为电视用户提供高清电视效果。     

Achievements in rotary head magnetic recording

The principal achievements since 1980 in rotary head recording on magnetic tape are outlined. These developments are related to fundamental improvements in recording media, heads, the design of tape transports, and signal processing. The D-1 and D-2 video tape recorders (VTRs), the Hi-Band 8-mm video cassette recorder (VCR), and the rotary digital audio tape (R-DAT) recorders are discussed. The future of rotary head recorders for consumer digital VCRs, professional high-definition TV (HDTV) VTRs, and consumer HDTV VCRs is assessed     

Digital signal processing for video

Applications of the digital signal processing of video signals in broadcasting, communication, and consumer electronics are reviewed. These include: digital encoding systems, digital video effect equipment, and the television standards converter for broadcasting; videoconferencing and video telephone equipment; and TV receivers, including those for extended definition and high-definition television (EDTV and HDTV). Performance requirements for video signal processing (VSP) are discussed, and an example of a video signal processor comprising a parallel processor system composed of multiple VSP modules is examined. Future trends in VSP are predicted     

Wideband wide-tunable current-mode gamma corrector for HDTVapplications

A wide-tunable current-mode (CM) gamma corrector for HDTV camera applications is proposed. This gamma corrector provides accurate gamma control over a wide range by simple electrical adjustment of the gain of the weighting amplifier. It has a wide signal bandwidth of >40 MHz. Sufficient for HDTV video signal processing, and can be implemented using a simple integrated circuit with low power consumption     

Implementation of HDTV PES combiner based on horizontal six-block segmentation

We present the hardware design of the packetized elementary stream (PES) combiner in the third generation HDTV encoder in China, which is a key part in the HDTV encoding system. In our design, the input HDTV video signal is divided into six sub-images, and a horizontal six-block segmentation method is implemented in the HDTV encoder. Each of the sub-images is coded by one MP@ML encoding ASIC, which works at a different bitrate. The PES combiner combines all the output bit streams into one HDTV PES. The coding parameters and timing stamps are modified according to the requirements of MPEG-2 MP@HL. All these PES combiner functions are implemented by one complex programmable logic device (CPLD), which makes the whole encoding system compact and stable. The detailed discussions of hardware design are also presented in this paper. Experimental results show that the quality of decoded image is improved over the past two generation encoders, and constant bitrate can be maintained at the same time.     

高清晰度电视视频解码器码流分配电路实时实现技术

我国自行研制的第一代高清晰度电视功能样机视频编、解码器中,采用十字划分方案,以便使用标准清晰度电视视频编、解码芯片实现高清晰度电视视频编、解码器。文中在介绍高清晰度电视视频码流结构的基础上,提出了高清晰度电视视频解码器中码流分配电路的实现方法,并给出了实现结果。实验表明,使用该方法可以实现码流中头信息的修改、码字划分及不定长视频包的有序传输及控制。     

High-definition television systems

Fifteen years ago, in 1970, the NHK (the Japan Broadcasting Corporation) forecast today's information society and started research and development of a high-resolution and wide-screen television system which we now call high-definition television (HDTV) system, to produce a new television system most suitable to the creation of "video culture of the future." Wide ranging studies have been carried out by NHK on the establishment of desirable picture quality, picture aspect, and signal standards for transmission. The provisional HDTV system proposed by NHK based on the result of many studies and the performances of the system are described. Early in 1984, the MUSE system has been developed by NHK and the desirable HDTV information can be compressed with 8 MHz and packed with this system. Thanks to the development of the MUSE system, there is the potential of HDTV broadcasting via satellite and early introduction of HDTV into package media such as video discs and videotapes. The NHK's HDTV system was designed to match many other applications. Many kinds of HDTV equipment have been developed in Japan and HDTV is approached and studied in the relation to various aspects such as electrocinematography, printing, and medicine. NHK has been working on the development of the entire broadcasting system of HDTV to unite the whole world into one "television community" in the coming generation by a worldwide single standard. Video engineers all over the world should be aware of the importance of every possible effort toward the establishment of a global HDTV system.     

双核嵌入式处理器的HDMI高清接口设计

介绍了基于双核嵌入式处理器TMS320DM6446平台的HDMI接口的设计与实现。介绍了HDMI接口的工作流程、HDCP加密实现、信息帧控制以及与DVI兼容显示等。本系统可实现720p和1080i的高清视频输出。利用HDMI数字接口高分辨力、低损耗等特点,可以克服现有VGA模拟显示的许多缺点,极大提升了嵌入式平台图像质量。     

Obtaining higher resolution in Asia

Important advances in digital signal processing for HDTV have occurred in Asia. This article outlines these advances, including trends in standard resolution television (STV) and progress in superhigh definition (SHD) imaging. Video coding, video recording, SHD image processing, and digital satellite broadcasting are covered, and trends in digital satellite TV and the challenges facing successful implementation of the technology are presented, as well as future research and development targets for HDTV