Televes Televes
Televes
Language: en | es
Televes
Televes
Televes
Televes

NOT 550-2001-en

SMATV BASIC CONCEPTS

Description: 

television signal

from the tv camera you get three basic signals:

r (red), g (green), b (blue).

with these three signals a pal system will generate three basic composite signals which will transmit the video information:

  • luminance
    • ey = 0,3 er + 0,59 eg + 0,1 14 eb
  • chrominance
    • eu = 0,493 (eb - ey)
    • ev = 0,877 (er - ey)

these three basic signals will be amplitude modulated with a supressed carrier.

the baseband of the luminance signal and both those from the chrominance signals will be quadrature modulated at a center frequency of 4,43 mhz.



the audio information will be fm modulated at a 5,5 mhz with a frequency deviation of +/-50 khz. 2

rf units

in the radio frequency field, to simplify the use of units, we usually work with db units.

the voltage is measured in

db┬Áv = 20 log (volt/ 1 ┬Áv)

example

for 1 volt = 20 log (1000000/ 1) = 120 db┬Áv

Id Anrterior: 
81
Televes
Televes Televes