CS100 Lecture Notes - Lecture 6: Vladimir K. Zworykin, Nipkow Disk, Cathode Ray Tube
Today: Television
● Development and regulation
● News
● Space, place, and gender
● Medium theory
Soccer game clip where it is zoomed in on player instead of watching game → shows us that we
have expectations for how we watch sports (constant action, sound, commercials, etc),
television does certain things that other media can’t
Television - Key Dates
1884 = Nipkow disk
1920s = Zworykin and Farnsworth experiments
1927 = Farnsworth gets patent for electronic tv
1928 = First public demonstration of home tv (3 inches big)
1930s = Allen DuMont develops cathode ray tube
1932 = CDN Radio Broadcasting Corporation (becomes CBC in 1936)
1940s = Stall in tv due to WWII
1950s = Rise of tv as dominant medium
● Electromagnetic spectrum allows us to send information (audio/visual)
● Many networks developed in 1920s
● Television takes light signals from outside world, translating them back into visual
signals
● Nipkow disk perforated in spiral, each perforation captures pieces of live environment,
encoded in electrical signal and other disk makes it audible image and sound
● Tv is images that are refreshed at such a speed that they seem continuous
● High towers that communicate with each other, valleys, mountains, buildings etc block
signals
● 1940 = development of cable
● Vladimir Zworykin → iconoscope tube, electronic, recieved patent for first all electronic tv
system
● DuMont Model 1938 first commercial electronic tv set available in US
● 1939 Andrea tv
● Were not just gadgets but pieces of furniture in home
● Development pics up in late 30s and early 40s but comes to halt in WWII
● By close of 40s, production ramps up and goes even faster than before war
● Television operates at certain frequencies, bandwidth regulated → constrictions, digital
signal allows more channels using same airwaves… more regulation
● Tv, radio, broadcasting is public service → should it be controlled?
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Soccer game clip where it is zoomed in on player instead of watching game shows us that we have expectations for how we watch sports (constant action, sound, commercials, etc), television does certain things that other media can"t. 1927 = farnsworth gets patent for electronic tv. 1928 = first public demonstration of home tv (3 inches big) 1932 = cdn radio broadcasting corporation (becomes cbc in 1936) 1940s = stall in tv due to wwii. 1950s = rise of tv as dominant medium. Electromagnetic spectrum allows us to send information (audio/visual) Television takes light signals from outside world, translating them back into visual signals. Nipkow disk perforated in spiral, each perforation captures pieces of live environment, encoded in electrical signal and other disk makes it audible image and sound. Tv is images that are refreshed at such a speed that they seem continuous. High towers that communicate with each other, valleys, mountains, buildings etc block signals.
