사진으로 보는 TV 발전사

사진으로 보는 TV 발전사
Photos: A Fond Farewell to Analog Television Hulton-Deutsch Collection / CORBIS Origins No single person can claim invention of the television. First postulated in the late 19th century, the idea for a system that could transmit images through the air was developed incrementally by many researchers. Their efforts culminated in the 1920s, when both an American, Charles Francis Jenkins, and a Briton, John Logie Baird, above, built successful prototypes. Bettmann / CORBIS   Bettmann / CORBIS Breakthrough The first machines rendered crude images, for they relied on a mechanical system of scanning the origin image, sorely limiting their capabilities and potential. In 1927, a young American named Philo Taylor Farnsworth developed a commercially successful way to use a cathode-ray tube — the glass object in the photo above, projecting an image of Joan Crawford — to generate an electrical television signal.   Hulton-Deutsch Collection / CORBIS State of the Art Many investors tried and failed to capitalize on television's commercial potential. By the late 1930s, several standards were competing to dominate the market. The one controlled by EMI-Marconi, a 405-line frame that ran at 25 frames per second, shown in the 1950 photograph above, prevailed in the U.K. Another standard, using 525 lines at 30 images per second, was adopted in the U.S. Bettmann / CORBIS Marvel The first commercially successful television sets began to appear in U.S. showrooms in the early 1950s. This crowd is watching the coronation of Queen Elizabeth in a store window in Rockefeller Center in New York City. Bettmann / CORBIS Starmaker The medium's magical quality brought icons into America's living rooms, making actors like Milton Berle, Jack Benny and Henny Youngman, above, instant members of every household. Bettmann / CORBIS The Airwaves As soon as it became clear that televised content would have value, companies raced to broadcast, and it became necessary to regulate the frequencies at which television signals were transmitted. In 1952, when this photo was taken, the FCC had recently opened access to UHF, or Ultra High Frequency stations, ending a 3½-year freeze on new channels. Bettmann / CORBIS   Bettmann / CORBIS Otherworldly Perhaps no event illustrated television's power more than the live July 20, 1969, transmission of Neil Armstrong's historic walk on the moon. The miracle of the medium was overshadowed only by the grandeur of the astronauts' achievement. Henry Diltz / CORBIS Color Efforts to develop and market color transmission date back to the early 1950s — the first color set was introduced by RCA in 1954 — but it was not until the 1960s that it became profitable. By 1974, when this photograph was taken (inside a room at New York City's Delmonico Hotel) color television had become a staple of every prosperous American home. Bettmann / CORBIS Image in Your Pocket For as long as television has been in American homes, inventors have sought ways to let consumers take it on the road with them. As early as 1959, Philco was marketing a version with a two-inch screen. This model, produced briefly in the U.K. during the 1980s, featured a flat screen and FM radio. Sergio Gaudenti / Kipa / Corbis Let a Thousand Stations Bloom Until the 1980s, American broadcast television was dominated by three large networks. Viewers in European and Asian countries were likewise limited in their viewing choices. But with the introduction of cable and satellite technologies, the airwaves opened up to an almost infinite variety of programming possibilities. Joe Raedle / Getty R.I.P. On June 12, 2009, all analog television transmission in the U.S. will cease. Older sets that are not hooked up to a special converter box will no longer work.   2012/03/09 에 퍼 옴