NationMaster - Encyclopedia: DigiCipher 2

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Encyclopedia > DigiCipher 2

DigiCipher 2, or simply DCII, is a digital signal compression standard used on many communications satellite television and audio signals. The DCII standard was originally developed in 1997 by General Instrument, which is now the broadband division of Motorola. U.S. military MILSTAR communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications. ... 1997 (MCMXCVII) is a common year starting on Wednesday of the Gregorian calendar. ... General Instruments Microelectronics was a division of General Instruments Corporation. ... Motorola (NYSE: MOT) is a global communications company based in Schaumburg, Illinois, a Chicago suburb. ...

The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct PrimeStar medium-power DBS system during the early 1990s. The DCII standard predates wide acceptance of DVB-based digital terrestrial television compression (although not cable or satellite DVB) and therefore is incompatible with the DVB standard. World map showing North America A satellite composite image of North America. ... In cryptography, encryption is the process of obscuring information to make it unreadable without special knowledge. ... PrimeStar is a now-defunct U.S. direct broadcast satellite organization formed in 1991. ... Direct broadcast satellite (DBS) is a term used to refer to satellite television broadcasts intended for home reception, also refered to as direct-to-home signals. ... The 1990s decade refers to the years from 1990 to 1999, inclusive, the last decade of the 20th Century. ... DVB, short for Digital Video Broadcasting, is a suite of internationally accepted, open standards for digital television maintained by the DVB Project, an industry consortium with more than 270 members, and published by a Joint Technical Committee (JTC) of European Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization (CENELEC...

The primary difference between DigiCipher 2 and DVB lies in how each standard handles SI, or System Information. DigiCipher 2 also relies on the fact that its signals must be understood in terms of a virtual channel number in addition to the DCII signal's downlink frequency, whereas DVB signals have no virtual channel number.

Approximately 70% of newer first-generation digital cable networks in North America use the 4DTV/DigiCipher 2 format. The use of DCII is most prevalent in North American digital cable television set-top boxes. DCII is also used on Motorola's 4DTV digital satellite receiver and StarChoice's DBS receiver (StarChoice is based in Canada). 4DTV is the name of the digital TVRO communications satellite receiver box manufactured by Motorola. ... Coaxial cable is often used to transmit cable television into the house Cable television or Community Antenna Television (CATV) (often shortened to cable) is a system of providing television, FM radio programming and other services to consumers via radio frequency signals transmitted directly to peopleâ€™s televisions through fixed optical... StarChoice is Canadas second direct broadcast satellite television distributor (the other being Bell ExpressVu), and is majority-owned by cable TV operator Shaw Communications Inc. ... Direct broadcast satellite (DBS) is a term used to refer to satellite television broadcasts intended for home reception, also refered to as direct-to-home signals. ...

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NationMaster - Encyclopedia: DigiCipher 2 (780 words)
	DigiCipher 2, or simply DCII, is a digital signal compression standard used on many communications satellite television and audio signals.
	The original attempt for a North American digital signal encryption and compression standard was DigiCipher 1, which was used most notably in the now-defunct PrimeStar medium-power DBS system during the early 1990s.
	DigiCipher 2 also relies on the fact that its signals must be understood in terms of a virtual channel number in addition to the DCII signal's downlink frequency, whereas DVB signals have no virtual channel number.

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