1. . . .
Vocabulary
to add -
to appear
to pick up ,
single ,
screen
size -
in addition to ...
in. inch
pick-up coil
ordinary link
single stage
disappearance of the signals
screening effect
image fault
TYPES OF TELEVISION SIGNALS
The picture intermediate frequency signal is amplified by several stages having wide-band frequency characteristics and is then fed into the video (picture) detector, where the intermediate frequency signal is then demodulated in the same way as in an ordinary sound receiver. The video (picture) signal which appears in the output of the detector is then amplified in a video amplifier, which corresponds to the audio amplifier in a sound receiver, except that it must pass a much wider range of frequencies.
In place of the loud-speaker used in the sound system, a device is used which converts the varying amplitude of the video signals into corresponding variations of light.
The picture intermediate frequency signal is amplified by several stages having wide-band frequency characteristics and is then fed into the video (picture) detector, where the intermediate frequency signal is then demodulated in the same way as in an ordinary sound receiver. The video (picture) signal which appears in the output of the detector is then amplified in a video amplifier, which corresponds to the audio amplifier in a sound receiver, except that it must pass a much wider range of frequencies.
In place of the loud-speaker used in the sound system, a device is used which converts the varying amplitude of the video signals into corresponding variations of light.
Questions
1. What impulses are sent out by the television transmitter?
2. What is the purpose of the special signals?
3. By what means are the picture and audio signals picked up?
4. On what part of the television system do picture images appear?
5. What is the size of the ordinary cathode-ray tubes?
6. What is the picture reproducing cathode-ray similar to?
7. To what kind of amplifier does a video amplifier correspond?
Task 2. Translate and write down the following words and word combinations in your workbooks. Make up a short plan of the text TYPES OF TELEVISION SIGNALS and write it down in your workbooks, summarize the text in short.
2. . » , .
Short theoretical information and a sample of implementation
( )
|
|
|
Word Formation ()
(). de-, dis- .
de- : - , ; - , , ( : ), : to code () to decode (, ). de-, , , - ; , : to detrain (train ) .
dis- , . : - , , , (: ). : to allow () to disallow ();
to appear () to disappear ().
Translate the following words and word combinations in written form.
.
Words
1. to degas _______________________________________
2. to decentralize__________________________________
3. to disappear____________________________________
4. to decode______________________________________
5. disadvantage ___________________________________
6. disbalance_____________________________________
7. disappearance_________________________________
Words
ordinary________________________
synchronize_____________________
model__________________________
Word combinations
the area of the picture-tube screen_____________________________________________
picture impulses in addition to the special signals_________________________________
several separate intermediate frequency channels _________________________________
picture intermediate frequency amplifier________________________________________
Task 3. Prepare a presentation of the topic TYPES OF TELEVISION SIGNALS: make up slides about the topic TYPES OF TELEVISION SIGNALS, write down the material of the slides in your workbooks, prepare your report (presentation) for the demonstration it in the lecture-room.
3. »: », , () .
16. 16. Unit 3.5. FREQUENCIES BAND FOR TV SIGNAL TRANSMISSION
3.5.
