The challenges of digital HDTV: complex compression coding and motion compensation algorithms are key techniques used by system designers
Article Abstract:
Four all-digital candidates for the future US high-definition television (HDTV) broadcasting standard will be tested by the Federal Communications Commission (FCC) in early 1992. The FCC is requiring candidate systems to simulcast both the current National Television System Committee (NTSC) signal and the HDTV signal. Advantages of all digital HDTV over analog or hybrid systems include pictures free from atmospheric noise and other interference, superior resolution and more flexible channel use. Drawbacks include abrupt degradation with distance, more limited coverage area, wider broadcast band width required and the need to resist high-power NTSC signals on adjacent NTSC 'taboo' broadcast bands. All four systems propose to use the bands, video bandwidth compression and error correction. The systems are General Instrument's (GI's) DigiCipher, Zenith-AT&T Digital-Compatible HDTV System, Advanced Television Research Consortium's Advanced Digital Television and the American Television Alliance's (the Massachusetts Institute of Technology and GI) ATVA-Progressive System.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1991
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Chasing Japan in the HDTV race
Article Abstract:
High-definition television (HDTV) is becoming a reality in Japan, while Europe and the US lag behind, and hopes for a worldwide HDTV standard appear unlikely. Japan is broadcasting one hour of band-compressed multiple sub-Nyquist sampling encoding HDTV daily from the country's BS-2 satellite to prototype HDTV receivers (with terrestrial broadcasting limited to extended-definition television because of bandwidth limitations). Major consumer market penetration is not expected until 1995. The European Eureka 95 HDTV research program is developing HD-MAC, 1,250-line, 50-Hz systems. There are major disagreements over the need for a US domestic HDTV development effort and whether it would rebuild the US consumer electronics industry, but the Defense Advanced Research Projects Agency is reviewing 87 HDTV proposals. The variety of HDTV standards and likely evolution of HDTV are described.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1989
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Flexible transistors
Article Abstract:
Flexible thin-film transistors (TFTs) are circuit arrays on flexible substrate material. TFTs were originally developed in the late 1960s, but were overtaken by devices based on other technologies. TFTs are now used for their thin-film fabrication technology in large-area addressing matrices for flat-panel displays. Active-matrix displays are used by at least eight Japanese makers of pocket television sets.
Publication Name: IEEE Spectrum
Subject: Engineering and manufacturing industries
ISSN: 0018-9235
Year: 1988
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