A technical assessment of advanced television
Article Abstract:
Advanced Television (ATV) has three categories: High-Definition Television (HDTV), Enhanced Definition or Extended Quality Television (EDTV/EQTV), and Improved Definition Television (IDTV). The Federal Communications Commission (FCC) sets the direction for analog ATV in the US for over-the-air transmission (terrestrial broadcasting) of HDTV. ATV does not need to be broadcast over-the-air and terrestrial broadcasting may not be the most important delivery system for HDTV. Fiber-based networks and pre-recorded material for home players are expected to be the two delivery systems with the most long-range potential. Determining whether HDTV or EDTV/IDTV is better means answering the questions of relative costs, ease of acceptance, quality differences, and degree of improvement over the current NTSC TV. IDTV's time window is projected to be between 1990 and 1994; if it does not succeed then, it probably will not succeed. EDTV/EQTV's time window is between 1990 and 1997. HDTV's time window starts in the 1992/2005 time frame and HDTV will succeed. HDTV needs a large display device to be fully appreciated so display technology will play a key role in HDTV's success.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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Advanced communications technology satellite (ACTS) and potential system applications
Article Abstract:
The Advanced Communication Technology Satellite (ACTS) is an NASA-sponsored program that develops and flight tests high risk, advanced satellite communications technology. The ACTS system consists of a satellite, a ground segment, and the network operation. The key technology elements are the ACTS hopping spot beams, the on-board, demand-assigned baseband switching and routing, and the on-board remodulation. Four scenarios that use ACTS technology all or in part include BBP ACTS-like system at Ku Band (BBP System), Matrix Switch (MS) ACTS-like system at Ku Band (MS System), Thin route small terminal system at Ka Band (Thin-Route System), and International/domestic skyphone at Ka Band (Skyphone). The Ku Band systems provide for higher throughput satellites and higher throughput per pound of satellite than current commercial spacecraft. The Ka Band systems provide thin route and mobile service with unlimited growth capability.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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Advanced Electrolysis Development for Hydrogen-Cycle Peak Shaving for Electric Utilities
Article Abstract:
A hydrogen-cycle peak-shaving (HCPS) energy storage system can be located in populated areas to improve load factors and maximize utilization of equipment. HCPS systems are described with a summary of features and benefits. A unique solid-polymer electrolyte (SPE) electrolysis system is a key element in an HCPS system.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1983
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