Вопрос № 191058 - Английский язык

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A telecommunication system consists of three basic elements:
– a transmitter that takes information and converts it to a signal;
– a transmission medium that carries the signal; and,
– a receiver that receives the signal and converts it back into usable information.
For example, in a radio broadcast the broadcast tower is the transmitter, free space is the transmission medium and the radio is the receiver. Often telecommunication systems are two-way with a single device acting as both a transmitter and receiver or transceiver. For example, a mobile phone is a transceiver.
Telecommunication over a phone line is called point-to-point communication because it is between one transmitter and one receiver. Telecommunication through radio broadcasts is called broadcast communication because it is between one powerful transmitter and numerous receivers.

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The study of communication process has led to a new discipline, known as "communication theory". The human elements in any communication process are a message source, a message medium and a receiver. This simplest case might be one person talking to another. The person talking is the transmitter or message source, air is the separating message medium, and the listener is the receiver. To communicate, information of some sort must be transferred. "Information" in communication theory is defined as any organized signal. It can be a series of letters, a series of picture scanning elements, etc.

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There are encyclopedias that contain video programs depicting chemical and biological processes in nature.

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Cellular telephones are frequently used as in-flight radiotelephones.

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E-mailing gave people the opportunity to send letters at the speed of a phone call.

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Lap-top computers are small and inexpensive enough to be purchased by individuals for use in their homes.