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television

broadcasting
Also known as: TV

Quick Summary

Broadcasting is the electronic transmission of radio and television signals for public reception. It involves systematically distributing entertainment, information, and educational programming to a scattered audience with appropriate receiving equipment. Sound broadcasting began around 1920, with television broadcasting starting in the 1930s.1

Early television development saw technical advancements in Great Britain, Europe, the Soviet Union, and the United States, making it technically feasible by 1931. Key innovations included the Emitron camera tube and improved cathode-ray tubes for receivers. The BBC launched the world's first high-definition service in 1936, using a 405-line standard that remained in use until 1962. In the United States, public demonstrations began in 1939, but World War II halted widespread activity. Post-war, the industry experienced rapid growth, with millions of receivers in use by the early 1950s.2

Transmission involves combining video and sound signals onto a carrier wave, which is then broadcast via antenna or cable. The signal weakens with distance, but receivers amplify it significantly for clear reception. Modern broadcasting also includes direct broadcast satellite (DBS) television and digital television, which uses compression techniques to fit more programming into available bandwidth. Digital television aims to replace analog broadcasting, offering possibilities like high-definition and multicasting.3456

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