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1、>01TelevisionTelevision一themostpervasiveandpersuasiveofmoderntechnologies,markedbyrapidchangeandgrowth一ismovingintoanewera,aneraofextraordinarysophisticationandversatility,whichpromisestoreshapeourlivesandourworld・Itisanelectronicrevolutionofsorts,madepossiblebythemamage
2、oftelevisionandcomputertechnologies.Theword"television",derivedfromitsGreek(tele:distant)andLatin(visio:sight)roots,canliterallybeinterpretedassightfromadistance.Verysimplyput,itworksinthisway:throughasophisticatedsystemofelectronics,televisionprovidesthecapabilityofconv
3、ertinganimage(focusedonaspecialphotoconductiveplatewithinacamera)intoelectronicimpulses,whichcanbesentthroughawireorcable.Theseimpulses,whenfedintoareceiver(televisionset),canthenbeelectronicallyreconstitutedintothatsameimage・Televisionismorethanjustanelectronicsystem,ho
4、wever.Itisameansofexpression,aswellasavehicleforcommunication,andassuchbecomesapowerfultoolforreachingotherhumanbeings・Thefieldoftelevisioncanbedividedintotwocategoriesdetenninedbyitsmeansoftransmission.First,thereisbroadcasttelevision,whichreachesthemassesthroughbroad-b
5、asedairwavetransmissionoftelevisionsignals.Second,thereisnonbroadcasttelevision,whichprovidesfortheneedsofindividualsorspecificinterestgroupsthroughcontrolledtransmissiontechniques・Traditionally,televisionhasbeenamediumofthemasses.Wearemostfamiliarwithbroadcasttelevision
6、becauseithasbeenwithusforaboutthirty-sevenyearsinaformsimilartowhatexiststoday・Duringthoseyears,ithasbeencontrolled,forthemostpart,bythebroadcastnetworks,ABC,NBC,andCBS,whohavebeenthemajorpurveyorsofnews,information,andentertainment.Thesegiantsofbroadcastinghaveactuallys
7、hapednotonlytelevisionbutourperceptionofitaswell.Wehavecometolookuponthepicturetubeasasourceofentertainment,placingourroleinthisdynamicmediumasthepassiveviewe匚电视电视-以快速变化与发展为标志的最普遍、最具有影响力的一项现代技术，正在步入一个极端复杂化与多样化的新吋代。这个时代承诺重新塑造我们的生活和我们的世界。这可以称得上是又一次电子革命，其关键在于电视技术与计算机技术的结合。”
8、电视”这个词来源于希腊语词根(tele：远)和拉丁语词根(vision：景象)，可以从字面上理解为来自远处的景象。简单说来，电视是以这种方式工作的，通过一个复杂的电子系统，电视能够将一-幅图像(这幅图像被聚
