TAILIEUCHUNG - Comprehensive Dictionary of Electrical Engineering

advanced compatible television (ACTV) an extended definition television system that can operate with existing bandwidths on ex- isting receivers and is compatible with the NTSC broadcasting system. The ACTV sys- tem was proposed by the Advanced Televi- sion Research Consortium and was the first high definition television (HDTV) system. HDTV system was tested by the FCC July 17, 1992. The additional picture information needed to increase the picture width and to increase the resolution to the HDTV format is transmitted in an augmented channel as an alternative to simulcast transmission. See Advanced Television Research Consortium | Book Definitions Electrical Engineering Dictionary. Ed. Phillip A. Laplante Boca Raton CRC Press LLC 2000 Special Symbols a-level set a crisp set of elements belong- ing to a fuzzy set A at least to a degree a Aa x 2 X I a x a See also crisp set fuzzy set. 1f common symbol for bandwidth in hertz. erGaAs common symbol for gallium ar- senide relative dielectric constant. erGaAs . erSi common symbol for silicon relative dielectric constant. erSi . e0 symbol for permitivity of free space. Ẽ0 X 10-12 farad meter. er common symbol for relative dielectric constant. VDC common symbol for DC to RF conversion efficiency. Expressed as a percentage. Va common symbol for power added ef- ficiency. Expressed as a percentage. Vt common symbol for total or true effi- ciency. Expressed as a percentage. ropt common symbol for source reflection coefficient for optimum noise performance. common symbol for permeability of free space constant. I 0 X 10-16 henrys meter. common symbol for relative perme- ability. common symbol for radian frequency in radians second. 2 n frequency. 0C common symbol for positive transition angle in degrees. 0- common symbol for negative transi- tion angle in degrees. 0cond common symbol for conduction an- gle in degrees. 0sat common symbol for saturation angle in degrees. 0CC common symbol for FET channel- to-case thermal resistance in C watt. 0JC common symbol forbipolarjunction- to-case thermal resistance in C watt. A common symbol for Richardson s constant. A amperes cm K BVgd See gate-to-drain breakdown voltage. BVgs See gate-to-source breakdown voltage. dv dt rate of change of voltage withstand capability without spurious turn-on of the device. Hci ne watts. nsh watts. See intrinsic coercive force. common symbol for excess noise in common symbol for shot noise in 2000 by CRC Press LLC nt common symbol for thermal noise in watts. 10base2 a type of coaxial cable used to connect nodes on an Ethernet network. The 10 refers

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