Лекция: ниями, обозначенными буквами a-d.

1________. The world’s first receiver was built in 1895 by the great Russian scientist Alexander Popov. There were no transmitters then, therefore his receiver could only pick up signals produced by lightning discharges during a thunder-storm. Popov demonstrated a device called a storm indicator at a meeting of scient-

ists in St. Petersburg on May 7, 1895. 2_________ .

Soon A. Popov found a way of transmitting Morse code signals. In 1896 he sent the world’s first wireless telegram over a distance of 250m. 3_________. Since then, the methods of transmission and reception have been constantly improved.

4________ .

a) Four years later the range of transmission was increased to 50 km.

b) Nowadays radio communication has no limits.

c)Radio was invented in Russia.

d) This day is marked now as a Radio Day.

Задание № 12 Прочитайте текст и выберите утверждение, соответствую-щее содержанию текста.

The telephone was invented in 1876. Speech transmission in those days was limited to a distance of a few miles and and the construction of the first telephone

was simple. The main parts were a transmitter and a receiver. At first there was a simple telephone circuit in which only one device served as both transmitter and

receiver.

Later development of the telephone changed its construction, it became more

complex. Transmitters and receivers were separated.The need to connect any two of a large number of telephone sets led to the development of a switchboard in 1878. The advantage of a central switching office with a switchboard was great. In

1889 telephone sets were interconnected automatically.

The number of telephones to be interconnected increased, and large cities needed more switchboard offices. Central offices grew in number.

a) The construction of the first telephone was complex.

b) Only one device served as both transmitter and receiver.

c) A switchboard appeared in 1889.

d) The number of telephones to be interconnected decreased.

Задание № 13 Прочитайте текст. Выполните задания.

Telephony is widely used in everyday life. By means of a telephone people can communicate with each other at a distance of thousands of kilometers.

When speaking over the telephone, we press the receiver to our ear. We speak in-

to the microphone or transmitter. The transmission of sounds over a distance is the transmission of oscillations. The frequency of the transmitted oscillations must be constant.

The microphone or transmitter consists of microphone housing, carbon chamber, carbon diaphragm, carbon granules, insulating spacer and conductor.

The current passes through the diaphragm, carbon chamber and carbon granules.

13.1 Определите, какой из заголовков соответствует тексту:

a) Telephony c) The Transmitter

b) The Receiver d) The frequency of the Oscillations

13.2 Найдите соответствующий перевод подчеркнутого слова:

a) здание c) размещать

b) корпус d) углубление

Задание № 14 Прочитайте текст. Выполните задания.

In a television system two separate transmitters are employed – one for the sound channel and the other for the picture channel. The sound transmitter is frequency-modulated and simultaneously transmits the sound which accompanies the image. Each transmitter has its own antenna.

The image being televised is received by the television camera which converts electrical impulses into optical impulses. These electrical impulses are amplified by the video or picture amplifier. After proper amplification, the video signal mo-

dulates the high-frequency carrier of the television transmitter and is radiated into

space by the aerial. The picture carried is amplitude-modulated. The antenna rece-

ives both the amplitude-modulated picture signals and the frequency-modulated sound signals that are transmitted on carriers.The carriers differ in frequency so that they may be separated in the receiver. The signals are passed to the radio fre-

quency selector by means of which the necessary station is tuned in. The frequency

modulated signals of the sound channel and the amplitude-modulated signals of the video channel pass from the converter. These signals are amplified and separated by the circuit blocks. They reach the loud-speaker and the kinescope, respectively.

14.1 Найдите соответствующий перевод подчеркнутого слова:

a) отделять c) отдельный

b) особый d) изолированный

14.2 Определите, какой из заголовков соответствует тексту:

a) Two Transmitters c) Television

b) The Frequency-modulated Signals d) Electrical Impulses

14.3 Найдите в тексте английские эквиваленты слов в скобках:

1) A television system (использует) a (звуковой) channel and a picture channel.

2) Optical (образ) is converted by the television camera.

3) The video signal modulates the high-frequency (несущая).

4) The necessary station is (настраивается) in by the radio frequency selector.

5) The picture and the sound are (передаются) (одновременно).

6) These signals are (усиливаются) and (разделяются) by the circuit blocks.

РЕКОМЕНДУЕМАЯ ЛИТЕРАТУРА

1. Агабекян И.П. Английский язык для средних профессиональных учебных заведений. Серия «Среднее профессиональное образование». – Ростов н/Д: Феникс, 2004. – 320 с.

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