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10. Put as many special questions as you can to the each of the following sentences:

1. The term "digital TV" is used in many different ways right now.

2. The picture is 1920x1080 pixels, sent at 60 complete frames per second.

3. The term "HDTV," is the most advanced form of digital TV in use in the United States.

4. The FCC gave television broadcasters a new frequency to use for their digital broadcasts.

5. A broadcaster can divide the channel into several different streams.

6. The HD format for digital TV has a 16:9 aspect ratio.

7. Broadcasters have the ability to use stream of digital data in several different ways.

8. Digital TV in the United States combines three different ideas.

9. Digital television can provide many-to-one, many-to-many, and one-to-one communication.

10. Digital TV will allow viewers to interact with game shows, ask questions during cooking shows, or call up purchase information regarding featured products.

11. Put these words in the right order to make sentences.

1. Broadcast / analog / TV / as / medium / started.

2. Antenna / you / TV / can / your / to / attach / an.

3. Each / one / digital / TV / broadcaster / has / channel.

4. Choose / between / broadcasters / can / formats / three.

5. HD / has / the / ratio / format / digital / for / a / aspect / 16:9.

6. Broadcaster / has / one / digital / each / TV / channel.

7. Can / program / broadcaster / at / a / send / Mbps / single / 19.39.

8. The / a / HD / ratio / than / formats / of / analog / digital / have / aspect / different / TV / TVs.

9. Broadcasters / the / use / have / stream / in / to / of / digital / data / different / several / ability / ways.

10. TV / digital / as / broadcast / free / started / a / medium.

12. Match the first part (1-8) of the sentence with the second one (a-h).

1. Frequency is …

2. Sensor is …

3. Digital television (DTV) is …

4. Channel is …

5. Decoder is …

6. Light is …

7. Intensity is …

8. Tuner is …

a) … a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument.

b) … a physical or virtual channel over which a television station or television network is distributed.

c) … a device which does the reverse of an encoder, undoing the encoding so that the original information can be retrieved.

d) … the number of occurrences of a repeating event per unit time.

e) … the transmission of audio and video by digital signals.

f) … a measure of the energy flux, averaged over the period of the wave

g) … a circuit module or free-standing equipment which detects electrical signals and converts them to a form suitable for further processing.

h) … the portion of electromagnetic radiation that is visible to the human eye, responsible for the sense of sight.

13. Insert the necessary prepositions:

Television really means seeing … (in, on, at) the distance. Pictures are not sent through the air. What is transmitted – is an electrical impulses. A pictures has to be changed into electrical impulses at one end and then those electrical impulses are being changed … (in, to, into) a picture at the other end. A camera lens focuses a picture … (in, on, with) a light-sensitive plate of glass. This plate throws … (on, off, at) electrons. In the bright areas of the pictures it throws … (on, off, at) many electrons and in the dark areas- few electrons. The electrons are then collected … (at, on, in) it target plate. In this camera tube at the other end from the target plate is an electron gun which throws a beam … (in, by, on) target plate. This beam is a scanning beam. It`s sweeps back and forth in lines across the target plate, so that covers the entire surface 30 times … (of, on, in) one second. The beam that bounced back is changed or modulated according to whether it strikes bright or dark area. The return beam is sometimes strong and sometimes weak, according to the image … (in, by, on) the target plate. This return beam which is the form of electrical impulses goes to an amplifier, then to the transmitting tower of the television station and is sent out. At the receiving end these impulses are picked up by an antenna and they go into an amplifier in your set, and are sent to an electron gun which is in your TV picture too. This gun sent … (to, from, out) a beam which goes back forth across your screen. Your screen also has winds and have been scanned every other line 30 times a second.