II. Fill in the blanks with the following words:

Was developed, is more complicated, is separated, is transmitted, can perceive, picks up, are usually termed.

1. The television receiver …signals. 2. In television broadcasting, the sound signal …simultaneously with the video signal.3. These signals …the picture signals.4. The iconoscope camera tube …as far back as the early thirties.5. The human eye, on the other hand, …many different objects at one and the same time.6. After amplification, the sound signal ….from the composite signal. 7. The transmission of video signals …than the transmission of audio signals by means of radio-waves.

III. Which of the following statements are true or false? If the statement is wrong, correct it:

1. Television provides a means of viewing the images of objects that are in our sight.2. The transmission of video signals is very simple, than the transmission of audio signals by means of radio-waves.3. The human eye can not perceive many different objects at one and the same time.4. The iconoscope camera tube was developed in 1970. 5. There is no difference between the perception of audio signals and video signals by the human being.

IV. Command`s game.

Group is divided into two commands. Students from one group give the definitions to the next words and another students try to guess them.

Channel. Conductor. Television. Gain. Signal.

Frequency. Noise. Kinescope. Amplify. Cable. Decoder.

Grammar

I. Open the brackets using the correct form of the Infinitive:

1. I hate (to bother) you, but the students are still waiting (to give) books their work.2. He seems (to know) English very well: he is said (to spend) his youth in London.3. She was sorry ( to miss) the beginning of the experiment.4. We hope (to know) everything by tomorrow.5. He seems (to read) now. 6. The engineer wants the new devices (to test) in the laboratory. 7. Vacuum tubes enable us (to amplify) the voltage or the pover.8. Radio enable the human voice (to transmit) around the globe.

II. Use the Objective Infinitive Construction in the following sentences:

M о d e 1: We know that the operator works well. →We know the operator to work well.

1. We know that the transmitter accepts the message and turns it into signals. 2. We know that the capacity of the channel is described in terms of its ability to transmit what is produced out of source of a given information. 3. Suppose that the word communication is used in a very broad sense. 4. We know that the receiver changes the signal back into a message. 5. We expect that the information source produces a message by successively discrete symbols. 6. When one meets the concept of entropy he has a right to expect that it is basic and important.

III. Use the Subjective Infinitive Construction in the following sentences:

Model: It is known that the operator works well.---The operator is known to work well.

1. It is known that the sound from the telephone is transmitted over long distances. 2. It is assumed that the word "information" in communication theory relates to what you could say. 3. It is proved that information is a measure of one's freedom of choice. 4. It is believed that the new method has given good results. 5. It is expected that the result agrees with theoretical predictions. 6. It is known that a system which produces a sequence of symbols according to certain probabilities is called a stochastic process. 7. It is likely that the information theory is known to the students. 8. It turns out that the technical problems are concerned with the accuracy of transference.

Presentation and Role-play

The role-play involves 12 students. Student 1 will be a chief of the conference, Student 2 -12 – scientists from different countries. Students should discuss:

1) What Is the Difference Between Analog and DTV Broadcasting?

2) What Is the Public Benefit of the DTV Transition?

Thank you for your presentation.

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