How TV’s Have Developed

Hemma Krishma Tura& Sanjay Raj

1927

- Phil Farnsworth.

- Television system that worked with a camera and receiver.

- At the age of 14 in 1920 he made a design for the first electronic television.

- Televisions that got experimented with were just spinning disks with holes in them and mirrors which were meant to convert light to electricity.

- His device was an “image dissector” as it converted individual elements of an image into electricity but it did so one at a time.

1929-1933- Vladimir Zworkin uses his kinescope

to demonstrate the first electronic system that uses both transmission and reception of images.

- TV studio was then opened by John Baird but the image quality was very poor.

- First TV advert was broadcast by Charles Jenkins.

- The BBC begin to regularly broadcast things on TV.

- Iowa state university broadcast television programmes twice a week and is in cooperation with the radio station WSUI. They were then granted a license.

1936

- Worldwide, there were about 200 televisions being used at this period of time.

- A coaxial cable was introduced and it was a pure copper wire surrounded by insulation and an aluminium covering. This wire is used to transmit television, telephone and data signals.

- The original coaxial cable first came about in 1936 and it’s system could carry 480 telephone conversations or one television programme. This gradually changed over the years as by the 1970's, systems could carry 132,000 calls or more than 200 television programmes.

1937-1939

- During 1937, the BBC began broadcasts that were of high definition of that time, in London.

- In 1939 Vladimir Zworkin and the radio corporation of America started to conduct broadcasts from the empire state building.

- In America there were a couple of places where television was demonstrated, the world fair in New York and in San Francisco at the Golden Gate International Expedition.

1940-1945

- Dumont company start making TV sets

- Peter Goldmark invents 343 lines of resolution for a colour system in a television

- 1941 was when a black and white television was released by the federal communications commission

- Vladimir Zworkin then went on to develop a better camera tube which is called Orthicon. This invention had enough light sensitivity to record outdoor events at night.

- Peter Goldmark’s system produced colour pictures by having a red, blue and green wheel spin in front of a cathode ray tube.

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 of operations. Reports from the time noted that the realism of seeing surgery in colour caused more than a few viewers to faint.

- Peter Goldmark's mechanical system got replaced by an electronical one but he is still recognised as the first to introduce a broadcasting colour television system.

- The first colour television had been approved by the FCC but then replaced by a second in 1953 which was developed by a better camera tube called the Vidicon which was invented by Vladimir Zworkin.

1956-1969

- Ampex introduce the first videotape system.

- Robert Adler invents the first remote control called the Zenith Space Commander. It was a remote controller that had moved on from the original 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 included in 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 in colour.

- The first TV transmission from the moon is shown and 600 million people watched.

1971-1979

- Half the TVs that are in home are now in colour

- Sony introduces Betamax which was the first home video cassette recorder

- PBS becomes the first station to switch to all satellite delivery of programs.

- 1,125 lines of resolution are now being demonstrated whereas it was 343 in the 1940’s.

- New idea is marketed, screen projection

Screen Projection

- DVD projector. - Overhead projector.- Filmstrip projector.

- 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.

1980’s-1990’s

- 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.

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 vertical blanking interval (VBI).

- “Television Decoder Circuitry Act Of 1990” is a law that was stated by the United States and meant that all televisions that were to be manufactured for sale in the U.S. must contain a built-in caption decoder if the picture tube is 13" or larger.

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.

TV's Now

- 3-D

- Plasma TV

- HDTV

- LCD TV

• Sizes of tv/cost

• pictures