номер 3, страница 41 - гдз по английскому языку 8 класс учебник Wetz, Pye

3. Read the text again and answer the questions.

1. What type of broadcasting uses radio waves?

2. What problems were there with this system?

3. What is binary code?

4. How can TVs receive digital information? Name four routes.

5. Does a decoder have to be inside a TV? Explain your answer.

6. What's the difference between an HDTV and a standard TV?

Broadcasting for the future

When television first started, the system of broadcasting was analogue. This meant that a TV aerial received radio waves from the TV companies. These transformed into sound and images on the TV screen. At the time, the system was revolutionary, but it wasn't perfect. It couldn't transmit many channels and the quality of the pictures was sometimes poor because of interference. For a long time there was only analogue TV, but at the end of the 1990s, digital television arrived.

Digital TV doesn't use radio waves. Instead, it converts sound and images into binary code. This is a computer language which only consists of zeros and ones and broadcasters can use it to send a lot of information very quickly. This digital information arrives at a TV via an aerial, a cable, a satellite dish, or broadband. Then a decoder converts the information back to sound and images. Decoders are either inside a TV or computer, or in a separate box which is connected to it.

Digital broadcasting is much better than the analogue system. There are a lot more channels because the TV companies can transmit much more information. The quality of the images and sound is much higher because there is less interference. Picture quality is even better on a high definition TV (an HDTV) than on a standard TV, so viewers can enjoy cinema-quality pictures in their own home.

1. Какой тип вещания использует радиоволны?

2. Какие проблемы были с этой системой?

3. Что такое двоичный код?

4. Как телевизоры могут принимать цифровую информацию? Назовите четыре способа.

5. Должен ли декодер находиться внутри телевизора? Объясните свой ответ.

6. В чем разница между HDTV и стандартным телевизором?

Ответ:

1. Analogue broadcasting uses radio waves. / Аналоговое вещание использует радиоволны.

2. The system couldn't transmit many channels and the quality of the pictures was sometimes poor because of interference. / Система не могла передавать много каналов, и качество изображения иногда было плохим из-за помех.

3. It is a computer language which only consists of zeros and ones. / Это компьютерный язык, который состоит только из нулей и единиц.

4. TVs can receive digital information via an aerial, a cable, a satellite dish, or broadband. / Телевизоры могут принимать цифровую информацию через антенну, кабель, спутниковую тарелку или широкополосное соединение.

5. No, a decoder does not have to be inside a TV. It can be in a separate box which is connected to it. / Нет, декодер не обязательно должен находиться внутри телевизора. Он может быть в отдельном блоке, который к нему подключен.

6. The picture quality is better on an HDTV than on a standard TV. / Качество изображения на HDTV лучше, чем на стандартном телевизоре.