Прочитайте текст и определите какой из заголовков соответствует тексту. A varying current from “outp...: ответ на тест 912135 - Английский язык

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A varying current from “output” transformer passing through the voice coil, varying forces are acting which cause it to vibrate back and forth. As the cone is driven back and forth, its large area sets air into vibration.
It is a well-known fact that large sized loud speakers are especially good at reproducing and dispersing low-pitched sounds. Due to diffraction and interference, however, high-pitched sounds are emitted in a narrow beam and in a forward direction only. Loud speakers with small cones are especially good on the high-pitched notes but are poor at reproducing the low ones.

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Telephony is the branch of telecommunication which provides for the exchange of information in the form of speech. In any telephone system speech or other sounds are converted into electric signals that are transmitted to a distant point where they are converted back into reproductions of the original sound.
Telephone set is an assembly of apparatus provided at each end of a telephone circuits to enable the user to make and receive calls.
A microphone forming part of a telephone set is called a telephone transmitter while a transducer forming part of a telephone set and used to convert voice-frequency currents into audible sounds is telephone receiver. The system also includes an electric bell responsive to low-frequency AC or pulsating current and is used as a calling device at a telephone station.

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In a broadcast system, a central high-powered broadcast tower transmits a high-frequency electromagnetic wave to numerous low-powered receivers. The high-frequency wave sent by the tower is modulated with a signal containing visual or audio information. The antenna of the receiver is then tuned so as to pick up the high-frequency wave and a demodulator is used to retrieve the signal containing the visual or audio information. The broadcast signal can be either analogue (signal is varied continuously with respect to the information) or digital (information is encoded as a set of discrete values).

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TV is one of our most important 1_______ of communication. It brings 2_______ and sounds around the world to 3_______ of homes. Communication satellites in space transmit TV pictures over oceans and continents.
By the late 1970’s, such devices as video cassette recorders, videodisc players, and personal 4_______ have changed the way people use television at their homes. For example, TV sets may be used for such purposes, as playing electronic games and receiving televised information services.

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Radio is one of 1_______ mass media. Radio 2_______ news, discussions, interviews, description of sport events, drama, religious programmes, music, and advertising.
There is at least one 3_______ in every country in the world, and altogether there are more than 25,000 stations all over the world. Radio stations 4_______ with one another.

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What is the Central Processing Unit used for?
The Central Processing Unit (CPU) is the brain of the computer. It reads and interprets software instructions and coordinates the processing activities that must take place. The design of the CPU affects the processing power and the speed of the computer, as well as the amount of main memory it can use effectively. With a well-designed CPU in your computer, you can perform highly sophisticated tasks in a very short time.