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The core of the digital terrestrial broadcasting, as well as satellite digital which started in December, 2000, is Hi-Vision. An HDTV image has five times more visual information than a conventional television picture, and 1,125 scanning lines in HDTV system give pictures their detailed realism. Also, a wide-screen format with a 16:9 aspect ratio provides a powerful viewing experience. HDTV also provides CD-quality sound and 5.1 surround sound broadcasting, which is capable of reproducing sounds with a realistic feeling of depth that gives listeners a heightened sense of involvement by using six-channel speaker system. NHK has delivered spectacular images from the Space Shuttle, the depth of the ocean, and the Antarctica. Almost 90% of NHK’s main channel (Digital General TV) is broadcast in HDTV.
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On an almost daily basis, new video or voice applications push the bandwidth requirements for DSL networks, while telecom carriers in the U.S. and worldwide are targeting delivery of digital and high-definition television (HDTV) to consumers. To achieve delivery of such services without deploying new fiber everywhere, carriers must leverage existing copper deployments already in the ground.
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When budding scientists in elementary, middle and high school need information about chemistry, they have a myriad of sources online. One very popular source turns out to be the Lab’s periodic table site, linked to the Chemistry (C) Division’s external home page. How popular is it? Since May 2000 the site has logged nearly two million hits. The site is maintained and updated by computer technician Nick Degidio and staff member Moses Attrep both of Isotope and Nuclear Chemistry (C-INC). “We average about 30,000 hits a month,” said Degidio. “And that number doubles around finals, term papers and midterm exam time. Its popularity is pretty surprising.”
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The Model D9887 HDTV Modular Receiver is designed to receive broadcasts using MPEG-2 4:2:0 or MPEG-4 AVC* 4:2:0 digital compression technology. It is ideally suited for decoding digitally compressed signals for primary distribution and contribution applications. With modular inputs and outputs, the D9887 receiver can be configured to suit the specific needs of your application. An optional IP input and output interface is available for IPTV applications.
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This eduGuide is intended for the video professional that is starting to become involved with designing, specifying, operating or maintaining digital video broadcast and distribution systems for HDTV. For over 50 years our industry has used television technology of a primarily analog nature. True, some digital technology has been used in broadcast facilities for standard definition or NTSC and PAL systems, but its deployment has been limited and ultimately converted back to an analog signal for distribution and broadcast.
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The essential distinction between SDTV and HDTV is bound up in the core issue of the term “high definition”. It implies that HDTV is distinguished from traditional video primarily by more “definition” – thus producing much higher picture sharpness. Thus, any discourse on mixing SDTV products with HDTV products needs to be closely examined from the viewpoint of its impact on the “high definition” aspect of the final imagery. Unlike the digital cameras and recorders that make up contemporary digital imaging systems, the lens is a totally analog technology. It is a very physical technology, in the fullest sense of the word. The lens is also dynamic— in terms of the substantial degree of control it can exercise over the object image that it presents to the camera image sensors.
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Today’s liquid crystal display (LCD) technology has found a great application with high-definition TV (HDTV), but the challenge has been to achieve high resolution, which requires faster data rates. Accelerating data rates require special image processing algorithms to support faster moving video. The industry is confronted with a major problem: how do you implement these algorithms and get a product out to market first, and do it within a known power budget?
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For several years, European broadcasters have been making programmes in high definition – often based upon co-production deals with the USA and Japan – using the 1920 x 1080 Common Image Format. However, European consumers are currently restricted to down-converted standard-definition versions of the original full-resolution HD content. This situation will soon change as more broadcasters offer HD services – in addition to the pioneering and ground-breaking start made by Euro1080.
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The THS8133, THS8134, THS8135, and the THS8200 devices are part of a family of chips for graphics and video applications, which contain triple DACs that operate up to 240 MSPS. For television applications, an analog low-pass filter is required to reconstruct the signal that is input to the monitor. High definition television (HDTV) requires a sampling frequency of 74.25 MHz and has pass-band, transition-band, and stop-band attenuation requirements, which affect the complexity of the filter. A higher sampling rate results in a lower filter complexity.
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The growing popularity and availability of HDTV is creating a small revolution in the video industry. New video systems must be capable of handling the standard NTSC (National Television System Committee) composite signal as well as high definition signals. Since low cost and low power concerns drive system designers to find the simplest solutions, this article describes a one transistor network that enables a single video sync separator to operate for both HDTV and NTSC systems.
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