The television system is considerably more complex than the sound-broadcasting system.
In a typical television system two separate transmitters are employed one for sound channel and the other for the picture channel.The sound transmitters is frequency-modulated and simultaneously transmits the sound which accompanies the image. Each transmitter has its own antenna.
The image being televised is received by the television camera, which converts the optical image into electrical impulses. There electrical impulses are amplified by the video or picture amplifier. After proper amplification, the video signal modulates the high-frequency carrier of the television transmitter and is radiated info space by the aerial. The picture carrier is amplitude-modulated.
Employ image
accompany carrier
‘modulate frequency-modulated
‘complex separate
Example:
1. How many separate transmitters 1.Two separate transmitters are employed
are employed in a television system? in a television system.
2. How is the picture carrier modulated? 2.The picture carrier is amplitude-
3. By what device is the image received? modulated.
3. The image being televised is received by
the television camera.
EXERCISES
A
Choose the proper word and put it into the blank space:
1. One tranmitter is … for the 1. employed, modulated
image channel,the other -for 2. amplitude-modulated,
the sound channel. frequency-modulated
2. The sound transmitter is … 3. converts, accompanies
3. The sound- transmitter trans- 4. frequency-modulated,
mits the sound which … the amplitude-modulated
image.
4. The picture carrier is …
B
Put questions to the answers given in the right-hand column:
1. What two channels … ? 1. A television system possesses
2. What … ? a sound chanel and a picture
3. By what means … ? channel.
4. What device … ? 2. The sound accompanies the
image.
3. The optical image is converted
Info electrical impulses by
the television camera.
4. The aerial radiates the video
signal info space.
C
Answer the following questions:
1. Which system is more complex –the television or the sound-broadcasting system?
2. What transmitters are employed in a television system?
3. By what device are electrical impulses amplified?
4. What is the function of the aerial?