XII. 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.

XIII. 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. Assume that the Iog₂16 is equal to 4. 3. 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. 4. Suppose that the word communication is used in a very broad sense. 5. We know that the receiver changes the signal back into a message. 6. We expect that the information source produces a message by successively discrete symbols. 7. When one meets the concept of entropy he has a right to expect that it is basic and important.

XIV. 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

XV. Read the following supplementary text and translate it using a dictionary. Put your own questions on the text and discuss them with your fellow-students.

SUPPLEMENTARY TEXT. CCIR AND TELEVISION

The CCIR has been paying considerable attention to studies concerned with television, over a number of years, especially in regard to:

— characteristics of systems for monochrome and colour television broadcasting;

— international exchange of television programmes and digital methods of transmitting television information;

— picture quality and the parameters affecting it;

— planning of television broadcasting networks, including receivers and antennae;

— measurement and monitoring of television signals;

— recording of video programmes;

— broadcasting-satellite service (television).

In the CCIR, the technical aspects of television broadcasting are considered by Study Group 11, which was set up at the V Plenary Assembly of the CCIR (Stockholm, 1948). The Chairman of Study Group 11 is Prof. M.I. Krivosheev (USSR), who has contributed effectively to the work of the CCIR for more than 25 years and is one of the most eminent television experts of our country.

Study Group 11 works in close co-operation with a number of other Study Groups; for example, the study of questions relating to recording of television programmes and satellites television broadcasting is carried on inclose collaboration with Study Group 10. Significant progress has been made in standardizing monochrome and colour television systems. Over a number of years, the CCIR has studied many systems of both kinds, and a careful analysis has led to the conclusion that it would be desirable to limit the number of systems to facilitate international exchanges.

LESSON 13

Text: What is a computer?

Pre-text exercises