EXERCISE 2 Words and expressions to be remembered

Signals - сигналы

be converted (into ) – быть преобразованным

bed ecoded - быть расшифрованным

to create – создавать

receive -получить

transmit – передать

EXERCISE 3

Make up your own sentences with the word combinations and phrases from exercise 2

EXERCISE 4

Divide the information from the text into several logical parts and make up a plan.

Describe the process of creating and receiving the signal of each device mentioned. Retell the information using your plan.

Text II

Transmitting the Signal

EXERCISE 1

Read and translate the text and say about the way telecommunications systems deliver messages.

Telecommunications systems deliver messages using a number of different transmission media, including copper wires, fiber-optic cables, communication satellites, and microwave radio. One way to categorize telecommunications media is to consider whether or not the media uses wires. Wire-based (or wire-line) telecommunications provide the initial link between most telephones and the telephone network and are a reliable means for transmitting messages. Telecommunications without wires, commonly referred to as wireless communications, use technologies such as cordless telephones, cellular radio telephones, pagers, and satellites. Wireless communications offer increased mobility and flexibility. In the future some experts believe that wireless devices will also offer high-speed Internet access.

1. 
   Devices such as the _______relay messages by creating modulated electrical impulses, or impulses that change in a systematic way.
   
2. 
   In the early days of the telegraph, _______were decoded by telegraph operators.
   
3. 
   _____ is one type of electromagnetic radiation, a form of energy that travels in waves.
   
4. 
   These impulses are then sent along____, through the ___as radio waves, or via other ___to a receiver that decodes the modulation.
   
5. 
   _________works in a similar fashion, as radio and cellular radio telephones.
   
6. 
   The form of transmission, which works by modifying _____signals, making the signals imitate, or_____, the original message is known as analog transmission.
   
7. 
   ____can be transmitted faster and more clearly than analog signals, because the impulses only need to correspond to two ____and not to the full range of qualities that compose the original message, such as the pitch and volume of a human voice.
   
8. 
   A large number of computers rely on ________provided by telephone and cable television companies to send____, music, and _____over the Internet at high speeds.