Basic TV System
TV System 3 type.
PAL Phase Alternating Line Developed by German engineer Walter Bruch in 1963 and the first commercial application of the PAL system in August 1967.TV line a 625-line horizontal display and a 576-line vertical lines and 25 frame per second and separate bandwidth between picture and sound.Using the power 220v/50hz provide an overview(720x576) = 414,720 points (or 768 x 576 = 442,368 points) the ratio of the display area 4:3 standard the values 0.41 MegaPixel or 0.44 MegaPixel used in Thailand,England,France,Germany.
NTSC The National Television System Committee was established in 1940 the first image signal system started used in 1940 in the world by NTSC this system uses 30 frames per second. Each of these consists of TV line 525 horizontal line and 480 line vertical lines and more important the system is used lighting 110V/60HZ. in home, provide an overview 720x480 = 345,600 points, Ratio of image display 1.5 (3:2) the values 0.34 MegaPixel used in America, Japan, Myanmar, Canada.
SECAM System Electronique Pour Couleur Avec Memoire or Sequential Color and Memory was developed in France and used in 1967 a horizontal line number 625 – line and a 576-line vertical line send multiform signal each bandwidth,such as B,D send VHF Series G,H,K send UHF Series I,N,M,K1,L to the VHF/UHF and each will be receiving revelations and send TV line up to 800-1000 line, 60Hz power system frequency band is very wide a few slots available and make unpopular in used.
Table compares three parameters of the television system.
TV Systems frequency used 3
When started TV System in the Thailand we used PAL BG and frequency is divided into 3 parts is VL,VH and UHF each district will have a frequency channel is VL (CH.2-4) VH (CH.5-12) and UHF (CH.21-69), including 50 channels.
Later, Channels are more TV system wants to use more frequency channels the frequency S-Band used by each area will channel frequency increased. Is VL (CH.2-4 X Y,Z Z1 Z2) VH (S1-S10, CH.5-12,S11-S20) and UHF (S21-S41,CH.21-69) total 106 channel.
PAL BG Frequency
Choosing a channel frequency
Remark : Analog TV frequencies in air and Digital TV frequencies in each province are not the same. Find out from the NBTC or the HSTN website.
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