.....................最新资料整理推荐..................... Unit 1 Living with technology The evolution of video and sound devices Early history of TV The first public TV broadcasts were made in the USA in 1925. Later, in 1928, the first long-distance TV broadcast was made between the UK and the USA. Regular public broadcasting followed shortly afterwards, first beginning on 11 May 1928 in New York and on 20 August 1929 in London. Many different people contributed to the development of TV. Most early TV broadcasts were made usinga system developed by John Logie Baird in the UK.However, his system was very primitive and had many drawbacks. An American,Philo Farnsworth, made important breakthroughs in the development of TV in thelate 1920s and early 1930s. Modern TVs use many of the principles first discovered by Farnsworth.John Logic Baird constructed the first colour TV in 1928, but it was not until 1938 that the first colour TV programme was broadcast. It took more than two decades, though, until 1951, for regular colour TV broadcasts to begin in the USA. Regular colour TV broadcasts were delayed in the UK until 1967. However, within a short time nearly all TV broadcasts were made in colour, and within five years more colour TVs than black-and-white TVs 1 .....................最新资料整理推荐..................... were being used. The modern age：satellite TV Satellites were used to broadcast TVbeginning in 1962. Satellites allow TV to be broadcast live over vast distances, with everyone receiving the same broadcast atthe same time. They also make TV accessible to people who live far away from cities, and satellite dishes can often be seen distributed throughout the countryside and remote areas. Of course, only a small percentage of people own satellite dishes.However, most people still benefit from satellite TV, as local TV companies broadcastthe signalsthey get from satellite receivers to the population living nearby.Early history of sound recorders It all began in 1877, when Thomas Edison made the first recording of a human voiceon his invention, the record player. Early record players used round tubes to record on. However, in 1887 Emile Berliner, a German living in the USA, invented arecord player that used discs as alternatives to tubes, and so the modern recordplayer was born. The first record players had to be wound up by hand and onlyplayed records that were two minutes long. Times surely have changed!Sound and video recorders 2
