The document traces the development of television from its early experiments in the 1920s to modern technologies. Some key developments include: - Philo Farnsworth's early experiments with electronic television in the 1920s. Regular broadcasts began in the 1930s by the BBC. - Introduction of coaxial cable in 1936 which improved signal transmission. Color television was also developed in the 1940s-1950s. - The 1950s saw the development of remote controls and the first satellite TV broadcasts. By the 1960s, most TVs were in color. - Home video recording was introduced in the 1970s with Betamax, and HDTV was approved in the 1980s along with surround sound and closed

1. How TV’s Have Developed
Hemma Krishma Tura
& Sanjay Raj

2. 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.

3. 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.

4. 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.

5. 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.

6. 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

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 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.

9. 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.

10. 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

11. 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.

12. 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.

13. 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.

15. 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.

16. TV's Now
- 3-D
- Plasma TV
- HDTV
- LCD TV

17. •
Sizes of tv/cost

18. •
pictures