how tv’s have changed hemma & sanjay

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Student presentation on aspects of home cinema


  • 1. How TVs Have Developed Hemma Krishma Tura& Sanjay Raj

2. 1927-Phil Farnsworth.-Television system that worked witha camera and receiver.-At the age of 14 in 1920 he made adesign for the first electronictelevision.-Televisions that got experimentedwith were just spinning disks withholes in them and mirrors whichwere meant to convert light toelectricity.-His device was an image dissectoras it converted individual elementsof an image into electricity but it didso one at a time. 3. 1929-1933-Vladimir Zworkin uses his kinescopeto demonstrate the first electronicsystem that uses both transmissionand reception of images.-TV studio was then opened by JohnBaird but the image quality was verypoor.-First TV advert was broadcast byCharles Jenkins.-The BBC begin to regularly broadcastthings on TV.-Iowa state university broadcasttelevision programmes twice a weekand is in cooperation with the radiostation WSUI. They were thengranted a license. 4. 1936-Worldwide, there were about 200 televisions being used at thisperiod of time.-A coaxial cable was introduced and it was a pure copper wiresurrounded by insulation and an aluminium covering. This wire isused to transmit television, telephone and data signals.-The original coaxial cable first came about in 1936 and its systemcould carry 480 telephone conversations or one televisionprogramme. This gradually changed over the years as by the 1970s,systems could carry 132,000 calls or more than 200 televisionprogrammes. 5. 1937-1939-During 1937, the BBC began broadcasts that were of high definitionof that time, in London.-In 1939 Vladimir Zworkin and the radio corporation of Americastarted to conduct broadcasts from the empire state building.-In America there were a couple of places where television wasdemonstrated, the world fair in New York and in San Francisco atthe Golden Gate International Expedition. 6. 1940-1945-Dumont company start making TV sets-Peter Goldmark invents 343 lines of resolution for a colour system in atelevision-1941 was when a black and white television was released by the federalcommunications commission-Vladimir Zworkin then went on to develop a better camera tube whichis called Orthicon. This invention had enough light sensitivity to recordoutdoor events at night.-Peter Goldmarks system produced colour pictures by having a red, blue 7. 1948-1950-Cable television was introduced in Pennsylvania-One million homes have got television sets in the United States-Viewers could come to a convention centre to see broadcasts ofoperations. Reports from the time noted that the realism of seeingsurgery in colour caused more than a few viewers to faint.-Peter Goldmarks mechanical system got replaced by an electronical onebut he is still recognised as the first to introduce a broadcasting colourtelevision system.-The first colour television had been approved by the FCC but thenreplaced by a second in 1953 which was developed by a better cameratube called the Vidicon which was invented by Vladimir Zworkin. 8. 1956-1969-Ampex introduce the first videotape system.-Robert Adler invents the first remote control called the Zenith SpaceCommander. It was a remote controller that had moved on from theoriginal wired remotes and units that failed in sunlight.-First split screen broadcast happens. Debate between Kennedy and Nixon.-Channel Receiver Act requires that channels 14 to 83 have to be includedin all sets that are now produced.-The first satellite carried out TV broadcasts.-Broadcasts that are featured on TV are now, the majority of the time, all incolour.-The first TV transmission from the moon is shown and 600 million peoplewatched. 9. 1971-1979-Half the TVs that are in home are now in colour-Sony introduces Betamax which was the first home video cassetterecorder-PBS becomes the first station to switch to all satellite delivery ofprograms.-1,125 lines of resolution are now being demonstrated whereas it was343 in the 1940s.-New idea is marketed, screen projection 10. Screen Projection-The first overhead projector was used for police identification work-It was used in quantity for training as World War II wound down.-It was used in schools and businesses.-In the late 1980s colour models became available.- Filmstrip projector.- Overhead projector.- DVD projector. 11. 1980s-1990s-Surround sound for home television is introduced.-Stereo TV broadcasts have now been approved of.-TV sets are now all required to have closed captioning.-The FCC approves HDTV.-There were one billion TV sets world wide. 12. Closed Captioning-Closed captions are hidden in the video signal.-Invisible to see without a special decoder.-The place they are hidden is called line 21 which is on the verticalblanking interval (VBI).-Television Decoder Circuitry Act Of 1990 is a law that was statedby the United States and meant that all televisions that were to bemanufactured for sale in the U.S. must contain a built-in captiondecoder if the picture tube is 13" or larger. 13. Blu-Ray- Ideas for Blu ray Discs were first released in October 2000.- The first player was released 3 years later in 2003.- June 2006, official release of Blu-Ray.- 2500 blu-ray disc titles released in Australia and UK in 2011.- 3500 released in United States and Canada in 2011.- 3300 titles released in Japan 2010. 14. TVs Now- 3-D- Plasma TV- HDTV- LCD TV 15. Sizes of tv/cost 16. pictures