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The evolution of video and sound devices.
電視和音頻裝置的發展
Early history of TV
電視的早期歷史
The first public TV broadcasts were made in the USA in 1925.
第一臺公共電視放映是在1925年的美國。
Later, in 1928, the first long-distance TV broadcast was made between the UK and the USA.
之后，1928年，英國與美國之間的長途電視播送成功。
Regular public broadcasting followed shortly afterwards, first beginning on 11 May 1928 in New York and on 20 August 1929 in London.
正規的公營廣播不久后也出現了，最初開始于1928年5月11日，在紐約，以及1929年8月20日，在倫敦。
Many different people contributed to the development of TV.
許多人為電視的發展付出了貢獻。
Most early TV broadcasts were made using a system developed by John Logie Baird in the UK.
大多數的早期電視廣播應用的是由英國John Logie Baird發明的系統。
However, his system was very primitive and had many drawbacks.
但是，他的系統很初級并且有很多弊端。
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.
一個美國人，Philo Farnsworth，在20年代末，30年代初對電視的發展做了重要的突破?，F代電視使用了很多Farnsworth發現的原理。
John Logie Baird constructed the first colour TV in 1928, but it was not until 1938 that the first colour TV programme was broadcast.
John Logie Baird于1928年制造出第一臺彩色電視機，但直到1938年第一個彩色電視節目才播出。
It took more than two decades, though, until 1951, for regular colour TV broadcasts to begin in the USA.
這花費了二十年，可是，直到1951年，普通彩色電視廣播才開始于美國。
Regular colour TV broadcasts were delayed in the UK until 1967.
普通彩色電視廣播推遲到1967年才在英國出現。
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.
但是，在很短的時間內，所有的電視廣播都成為了彩色，五年內，彩色電視的使用超過了黑白電視。
The modern age: satellite TV
現代：衛星電視
Satellites TV used to broadcast TV beginning in 1962. Satellites allow TV to be broadcast live over vast distances, with everyone recieving the same broadcast at the same time.
用人造衛星進行電視播放開始于1962年。衛星使得很遠地區能同時接收到相同的廣播。
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.
它們也使遠離城市的人們可以收看電視，在農村和邊遠地區可以看到衛星電視。
Of course, only a small percentage of people own satellite dishes.
當然，只有少部分人擁有衛星天線。
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.
然而，大多數人仍然受益于衛星電視，因為當地的電視公司把從衛星接收器收到的信號播送給附近的居民。
