RTV3007Lesson1 - RTV 3007 RTV History of Broadcast Media...

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Unformatted text preview: RTV 3007 RTV History of Broadcast Media Quick Facts Quick First radio broadcast: Reginald Fessenden, Christmas Eve, 1906 First radio network company: NBC, 1926 First “Top 40” radio broadcasts: 1952 Quick Facts Quick First public demonstration of TV: 1939 World’s Fair Cost of first TV commercial: $9 for :20 spot (1941) Cost of :30 spot in 2006 Super Bowl: $3 million The Inventors The The key to telecommunications is that electromagnetic energy can be transmitted between two points. Early inventors and inventions paved the way for the electronic mass media The Inventors The James Maxwell and Heinrich Hertz demonstrated the existence of electromagnetic radiation The Inventors The Samuel Morse invented the telegraph (1844) The Inventors The Alexander Graham Bell invented the telephone (1878) The Inventors The Both the telegraph and telephone businesses supported themselves through commercial means Both the telegraph and the telephone were point to point communication media. They sent a message from one source to a receiver. The Inventors The 19th Century Wired Communication • Weaknesses of Wired Communication The Inventors The 19th Century Wired Communication • Weaknesses of Wired Communication Construction The Inventors The 19th Century Wired Communication • Weaknesses of Wired Communication Construction Maintenance The Inventors The Guglielmo Marconi ­ Started experimenting with radio transmitters and receivers. Eventually he developed a powerful wireless business. The Inventors The Guglielmo Marconi obtained patent for his wireless telegraph (1896) The Inventors The Reginald Fessenden ­ tested his alternator on Christmas Eve, 1906, demonstrated that voice could be transmitted over the “ether.” • Fessenden’s alternator produced a continuous wave that was needed for the transmission of voice or music. The Inventors The De Forest’s “Audion” made it possible to amplify weak radio signals. The Audion modified the “Fleming valve” by inserting a wire grid between the plate of the tube and its cathode. • This invention helped make modern electronics possible ( http://www.cedmagic.com/history/deforest­audion.html) ...
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