牛津版 高中英语 电子课本 模块七M7U1
3页1、 The evolution of video and sound devicesEarly history of TVThe 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 11May 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 using a system developed by John Logie Baird in the UK. However
2、, his system was very primitive and had many drawbacks. An American, Philo Farnsworth, made important breakthroughs in the development of TV in the late 1920s and early 1930s. Modern TVs use many of the principles first discovered by Farnsworth.John Logie 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
3、 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 were being used.The modern age: satellite TVSatellites were used to broadcast TV beginning in 1962. Satellites allow TV to be broadcast live over vast distances, with everyone receiving the same broadcast at the same time. They also make TV accessible to people who live far away from cities, and satellite dishes c
4、an 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 broadcast the signals they get from satellite receivers to the population living nearby.Early history of sound recordersIt all began in 1877, when Thomas Edison made the first recording of a human voice on his invention, the record player. Early record players used round tubes to re
《牛津版 高中英语 电子课本 模块七M7U1》由会员ha****a分享,可在线阅读,更多相关《牛津版 高中英语 电子课本 模块七M7U1》请在金锄头文库上搜索。
2020~2021学年北京农大附中初一下学期期中政治试卷(详解)
2020~2021学年北京海淀区初一下学期期中语文试卷(答案)
2020~2021学年北京农大附中初一下学期期中政治试卷(学生版)
2020~2021学年北京海淀区初一下学期期中英语试卷(学生版)
2018~2019学年北京昌平区初一下学期期中语文试卷(学生版)
2018~2019学年北京昌平区初一下学期期中语文试卷(详解)
2020~2021学年北京中国农业大学附属中学初一下学期期中历史试卷(详解)
2020~2021学年北京延庆县初一下学期期中语文试卷(答案)
2020~2021学年北京西城区铁二中初一下学期期中数学试卷(详解)
2020~2021学年北京东城区北京文汇中学初一下学期期中数学试卷(学生版)
2020~2021学年北京海淀区初一下学期期中英语试卷(详解)
2020~2021学年北京西城区北京四十三中初一下学期期中生物试卷(详解)
2020~2021学年北京海淀区初一下学期期中地理试卷(学生版)
2020~2021学年北京延庆县初一下学期期中生物试卷(学生版)
2020~2021学年北京东城区北京文汇中学初一下学期期中数学试卷(详解)
2020~2021学年北京延庆县初一下学期期中语文试卷(学生版)
2020~2021学年北京海淀区初一下学期期中语文试卷(学生版)
2020_2021学年北京海淀区北京一零一中学初一下学期期中地理试卷(学生版)
2020~2021学年北京西城区北京市第八中学初一下学期期中数学试卷(学生版)
2020~2021学年北京海淀区101中学初一下学期期中历史试卷(学生版)
2024-03-28 4页
2024-01-30 6页
2024-01-23 23页
2024-01-23 25页
2024-01-23 7页
2024-01-23 31页
2024-01-23 14页
2024-01-23 9页
2024-01-23 15页
2024-01-23 22页