Businessbooksummariesreview.com

Television

The Fundamentals of Television
InthisreportontelevisionIwilldiscusstelevisionsignals,thecomponentsthemakeupatelevision,andhow a televisionproducesthepicture andsoundforthefinaloutput.
Thesoundcarrierisattheupperendofthespectrum.Frequencymodulationis usedtoimpressthesoundonthecarrier.Themaximumfrequencydeviationistwenty-fivekilohertz,considerablylessthanthedeviationpermittedbyconfessionalFMstereo.Asaresult,aTVsoundsignaloccupieslessbandwidthinthespectrumthana standardFMbroadcaststation.Stereosoundis availableinTV,andthemultiplexingmethodusedtotransmittwochannelsofsoundinformationisvirtuallyidenticaltothatusedinstereotransmissionforFMbroadcasting.
Thepictureinformationis transmittedonaseparatecarrierlocated4.5 MHzlowerinfrequencythanthesoundcarrier.Thevideosignalderivedfromacameraisusedtoamplitudemodulatethepicturecarrier.Differentmethodsofmodulationareusedforbothsoundandpictureinformationsothatthereisless interferencebetweenthepictureandsoundsignals.Thefulluppersidebandsofthe pictureinformationaretransmitted,butonlyaportionofthelowersidebandsissuppressedtoconservespectrumspace.Thecolorinformationina pictureistransmittedbywayoffrequencydivisionmultiplexingtechniques.Two colorsignalsderivedfromthecameraareusedtomodulateasubcarrierthat,inturn,modulatesthepicture carrieralongwiththemainvoiceinformation.Thecolor subcarriersuse double-sideband-suppressedcarrierAM.The videosignalcancontainfrequencycomponentsupto4.2 MHz.Therefore,if…

Leave a Reply

Your email address will not be published. Required fields are marked *

x

Hi!
I'm Harold

Would you like to get a custom essay? How about receiving a customized one?

Check it out