《牛津英语整理模块七课文及翻译.doc

Unit 1 TV and audio devices: a review Early history of TV The first public showings of wireless TV transmissions were made in 1925 in the USA and in 1926 in Britain. Later, in 1928,the first long-distance TV broadcast was made between the UK and the USA. Regular public broadcasting followed shortly after, first beginning on 11May 1928 in New York and in London on 20 August 1929. Many different people contributed to the development of TV. Because of this, it is still uncertain who invented TV. Altogether, three men could be responsible. Vladimir Zworykin, a Russian living in the USA, Philo Farnsworth, a farm boy from Utah in the USA, and John Logie Baird from Scotland all invented early forms of TV between 1923 and 1927. A few years later, color TV was first shown in 1929. It took more than two decades, though, until 1951, for colour broadcasts to begin in the USA. By 1967, most broadcasts were in color and within five years, more colour than black-and-white TV sets were being used. The modern age: cable TV, satellite TV, digital TV, ... Cable TV began in 1948 in the USA, but it took 50 years before 66 per cent of American households had it. Satellites were used to broadcast TV beginning in 1962. Some consider digital TV to be superior to satellite TV because it allows the same services to be delivered with clearer pictures than before. International standards for digital TV were established in 1989 and within five years, consumers in the USA had access to 200 channels. By 2004, digital TV signals were being received by 55 per cent of households in Britain. In 1996, a completely new concept was introduced when the first Web TV set-top boxes came onto the market. This combines the TV set with the World Wide Web. With interactive TV programming, you can play along with game shows, respond to questionnaires and chat to other viewers. Early history of audio devices It all began in 1877 when Thomas Edison made the first recording of a human voice. Ten years later, the fir