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Encyclopedia > Digital Satellite Service

Digital Satellite Service is the assumed acronym expansion of the DSS digital satellite television transmission system used by DirecTV. Only when digital transmission was introduced did direct broadcast satellite television become popular in North America, which has lead to both DBS and DSS being used interchangable to refer to all three commonplace digital transmission formats - DSS, DVB-S and 4DTV. Analogue DBS services however existed prior to DirecTV and are still operational in continental Europe as of 2006 Artists impression of a Boeing 601 satellite, as configured for digital television transmission by SES Astra Satellite television is television delivered by way of communications satellites, as compared to conventional terrestrial television and cable television. ... DirecTV is a direct broadcast satellite (DBS) service that transmits digital satellite television and audio to households in the United States and the rest of the Americas. ... 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. ... World map showing North America A satellite composite image of North America. ... 4DTV is the name of the digital TVRO communications satellite receiver box manufactured by Motorola. ... 2006 is a common year starting on Sunday of the Gregorian calendar. ...

At the time of DirecTV's launch in 1994, the DVB-S digital satellite system in use in the majority of the world had not yet been standardised, the Thomson developed DSS system was used instead. 1994 (MCMXCIV) was a common year starting on Saturday of the Gregorian calendar, and was designated the International year of the Family. ... 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 300 members, and published by a Joint Technical Committee (JTC) of European Telecommunications Standards Institute (ETSI), European Committee for Electrotechnical Standardization (CENELEC... Thomson has several meanings: Thomson SA, formerly known as Thomson Multimedia, a French electronics manufacturer and media services provider. ...

While functionally similar in DVB-S - MPEG 2 video, Musicam or AC3 audio, QPSK modulation, and identical error correction (Reed-Solomon coding and Viterbi forward error correction. However, the transport stream and information tables are entirely different to those of DVB. Also unlike DVB, all DSS receivers are proprietary DirecTV reception units. MPEG-2 (1994) is the designation for a group of coding standards for digital audio and video, agreed upon by MPEG (Moving Pictures Experts Group), and published as the ISO/IEC 13818 international standard. ... MP2, also known as Musicam, is a short form of MPEG Audio Layer II, and it is also used as a file extension for files containing audio data of this type. ... Description Dolby Digital is the trademark for Dolby Laboratories AC-3 audio coding system. ... Quadrature phase-shift keying (quadriphase, quaternary phase-shift keying) is a form of modulation in which a carrier is sent in four phases, 45, 135, 225, and 315 degrees, and the change in phase from one symbol to the next encodes two bits per symbol. ... Reed-Solomon error correction is a coding scheme which works by first constructing a polynomial from the data symbols to be transmitted and then sending an over-sampled plot of the polynomial instead of the original symbols themselves. ... Viterbi can mean: Viterbi algorithm, an algorithm in signal processing. ... It has been suggested that this article or section be merged with Error correction and detection. ...

DirecTV are now using DVB-S2, the latest version of the DVB-S protocol, for HDTV services off the SPACEWAY-1 satellite, however huge numbers of DSS encoded channels still remain. DVB-S2 is a newer specification of the DVB-S (Digital Video Broadcasting) standard. ... High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. ... SPACEWAY-1 is part of DirecTV’s constellation of direct broadcast satellites. ...

External links

  • DSS, the "Other Other" MPEG-2 system



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