emc 2410 lecture 10 spinning discs and biscuit tins
TRANSCRIPT
EMC 2410Intro to Electronic Media
Edward Bowen
Lecture Ten
Television Begins
Just What is Television?
Television is the electronic dissemination of still images in rapid enough succession to create the illusion of motion, and synchronized with sound.
And How Does Television Work?
http://www.youtube.com/watch?v=UivqdpliyA0
Basic Image Formation
• Persistence of Vision and Moving Pictures.
http://www.youtube.com/watch?v=3veFqnnob0A
Basic Image Formation
• Persistence of Vision and Moving Pictures.
http://www.youtube.com/watch?v=0t9Edrlk7gc
Basic Image Formation• 1948: How Does A TV Work
http://www.youtube.com/watch?v=tb_EXSIfHjA
Basic Image Formation• 1948: How Does A TV Work
http://www.youtube.com/watch?v=qnu9jvgrq58
Basic Image Formation• Cathode Ray Tube (CRT)
• Phosphorus Dots / Pixels
http://www.youtube.com/watch?v=D3OSTflMO80
Basic Image Formation• Cathode Ray Tube (CRT)
• RGB (Red, Green, Blue)
• Phosphorus Dots / Pixels
http://www.youtube.com/watch?v=cAZQxKaj8dk
Basic Image Formation• Electron Gun• Steering Coils• Phosphorus Screen
http://www.youtube.com/watch?v=GATkRMe_fl8
Basic Image Formation
• Scanning• Fields / Frames• Flicker Frequency: Flashes per second• Frames per second
http://videos.howstuffworks.com/discovery/29889-assignment-discovery-tv-and-flicker-frequency-video.htm
Early Development
• 1884 - Paul Nipkow proposed and patented the first mechanical television system. He devised the notion of dissecting the image and transmitting it sequentially. To do this he designed the first television scanning device. He was 24 years old.
Early Development
• 1900 - The first known use of the word "television, or “to see from a distance” occurs at the World's Fair in Paris.
Early Development• Inventors attempt to build mechanical television systems based on
Nipkow's rotating disks or
• Inventors attempt to build electronic television systems based on the cathode ray tube developed independently in England and Russia in 1907.
• American Charles Jenkins and Scotsman John Baird follow the mechanical model while
• Philo Farnsworth, working independently in San Francisco, and Russian emigrant Vladimir Zworkin, working for Westinghouse and later for RCA under David Sarnoff, advance the electronic model.
• Electronic television systems eventual replaced mechanical systems.
Who is the Father of Television?
JohnLogieBaird
PhiloFarnsworth
VladimirZworykin
Or ?
David Sarnoff
John Logie Baird
Scottish by birth.Calvinist by upbringing.Loner.Driven.Tireless.Working in obscurity and poverty.
He is considered the inventor of mechanical television, basing his system on the the Nipkow Disc.
Baird - The Televisor• 1923 - Baird patents his television design. • 1924 - He builds a working prototype, the "Televisor." • It has a motor mounted in a tea chest, with a home-made
Nipkow disc (a cardboard circle cut from a hat box), a darning needle for a spindle, and a discarded biscuit box as a lamp housing, all assembled with sealing wax and string.
• Apart from the motor, his greatest investments are a few bull's-eye lenses, costing four pence each.
• He transmits a silhouette of a cross two or three yards.
Baird - The Televisor• October 2, 1925 - In his laboratory, Baird transmits the first
grayscale television picture, the head of a ventriloquist's dummy nicknamed "Stooky Bill," in a 30-line vertically scanned image, at five pictures per second.
Baird - The Televisor• He proceeds with public demonstrations …
Baird - The Televisor• And the media think him mad …
Baird - The Televisor• 1926 - Baird demonstrates a fully working prototype
of mechanical television, with grayscale moving images, to members of the Royal Institution at Baird's residence and laboratory.
http://www.youtube.com/watch?v=PmjXwU0pYao
Baird - The Televisor
http://www.dailymotion.com/video/xcz4k7_milestones-in-science-engineering-n_shortfilms
http://www.hulu.com/watch/135526/milestones-in-science-and-engineering-nipkow-baird-zworykin-the-development-of-television
Baird - The Televisor
http://www.youtube.com/watch?v=9DFcYRxFdTI
Baird - The Televisor
http://www.youtube.com/watch?v=8GYGxEk0btA
Baird - The Televisor
http://www.youtube.com/watch?v=D-yO07MQPMA
Baird - The Televisor• 1927 - Baird sends a cable transmission 438 miles to
Glasgow.• 1928 - Baird transmits images across the Atlantic
Ocean. • 1929 - With the BBC (British Broadcasting
Corporation), Baird begins experimental broadcasts.
Baird - The Televisor
“The Man With the Flower in His Mouth (1930) - the first televised drama produced in Britain,
screened by the BBC as part of their experimental transmissions.
http://www.youtube.com/watch?v=RJoYskwKxsM
Baird - The Televisor• 1935 - Scheduled electronic television broadcasting
begins in England, alternating between Baird’s and a competing system.
• Popular Mechanics articles described the competition.
Baird - The Televisor
Some 20,000 Baird Televisors would be sold across England and the Continent.
Baird - The TelevisorBaird moves on to
• Color Television (demonstrated in 1928)• Big Screen TV• Open Air Projections for Large Audiences• High Definition Television• 3-D Television
Before passing away in 1946.
Baird - The Televisor
http://www.youtube.com/watch?v=upoWPhjZksk
Baird - The Televisor
http://www.youtube.com/watch?v=LGzFz2Nrq6s
Baird - The Televisor
http://www.youtube.com/watch?v=y6O_I9l1kok