Vocabulary:

single – единый, один

loud speaker – громкоговоритель

to feed – питать usual – обычный

intermediate – промежуточный several – несколько

to correspond – соответствовать stage – каскад, ступень

bend – полоса

Task 2. Read and translate the following words without a dictionary:

synchronize, characteristics, special, modulate, demodulate, detector, reproduce, camera, voltage

Task 3. Read and translate the following word combinations:

radio frequency stage; detector output; separate inter­mediate frequency signals; separate intermediate frequen­cy amplifier channels

Task 4. Compare the meanings of these word combinations:

super heterodyne conversion method — conversion meth­od; frequency signal — sound intermediate frequency signal; wide band — wide-band frequency characteris­tics

Task 5. Read and translate the questions. Find answers to the questions in the text:

1. What kind of signals are picked up simultaneously by a single antenna?

2. What kind of carriers are converted by super heterodyne conversion method?

3. How many stages amplify the picture intermediate frequency signal?

4. What part of the television transmitter amplifies the video signal?

Task 6. Translate the text.

Colour Television

In the colour receiver the incoming signal goes through frequency and amplitude selective circuits. In these cir­cuits the brightness component, the colour component, and the horizontal and vertical beam-synchronizing com­ponents are separated. The brightness component is applied simultaneously to each of the three electron guns. The red, green, and blue colour signal voltage components are produced and are applied to the three respective kinescope electron guns. They combine with the brightness components voltage to produce beam intensities which reproduce the original picture.

Task 7. Read and translate the following word combinations:

frequency selective circuits; frequency and amplitude selective circuits; brightness and control components; horizontal and vertical beam-synchronizing components

Методические рекомендации:

Для полного понимания текста следует просмотреть активную лексику, и если необходимо, обратиться к англо-русскому словарю. Затем провести аудиторную работу над текстом с аналитическим чтением, контролем понимания и закреплением с помощью упражнений.

Рекомендуемая литература:

10 осн.(стр 24-25, 27-30).

Контрольные вопросы:

1. What is digital television?

2. What is high-definition television?

3. What kind of signals are picked up simultaneously by a single antenna?

4. What kind of carriers are converted by super heterodyne conversion method? 5

5. How many stages amplify the picture intermediate frequency signal?

6. What part of the television transmitter amplifies the video signal?

7. What circuit does the incoming signal go through?

8. What components are separated in the colour receiver?

9. What colour components are produced in the receiver?

10. With what other components do they combine?

Switch on

Task 1. Work in small groups. List as many ways as you can to send and receive messages.

EXAMPLE

1. by phone 2. writing

1. Identify the devices used in telecommunications in pictures A-F.

2.Work in pairs. Choose one device each and explain to your partner what it does.

EXAMPLE

A. I'll choose the space satellite.

В. OK. What does it do?

C. It follows an orbit in space. Some satellites help communication and others provide information...

Практическое занятие № 13

Тheme : Medical technology

Task 1. Look at the picture and describe it.

Task 2. Read the text and check your answers.