Digital television system, as it stands, refers to electrical transmission system that all data through video or audio devices be sent by digital transmission method after digital signal processing. Digital process refers to converting analog signal into digital one composed of 0 and 1 by intense digital technology. (refer to the picture below) This converted signal is sent by digital transmission process after being condensed with other information, the transmitted signal is again converted to the original video or audio devices.

Digital television is, so called, 3rd-generation television set that has passed by black-and-white, and also color age. Digital television is attached by a special IC (integrated circuit), on which various function can be added. By converting analog signal transmitted from broadcasting center, into digital signal through the IC, not only does it prevent video and audio signal from deterioration but also restores the signal accurately so that there is neither duplicated image caused by reflection of analog electric wave nor noise at all.

The number of scanning line in digital television reaches to 1,050 and the screen quality gets clean that much. We are able to compose multiple-screens in it by memory and process function of its broadcasting signal so as to enjoy 2 or 3 channels in one screen simultaneously, capture and enlarge, confirm the captured motion or print it out, a variety of functions else.

The appearance of digital television is at the time of distribution of IC, changing analog signal to digital one, which was developed by a German company in 1982, into the world market. In Korea, we succeeded in making digital television mass-production applying this IC sample and once was it showed on exhibition held in September, 1983.

Digital broadcast using digital technology, which has these features, is strong to noise and realizes efficient transmission of information so that it has diverse merits in comparison to current analog television.
First of all, digital television is clearer as twice as analog one because analog television on which the number of width scanning line is 525, has only about 330 lines of horizontal resolution, otherwise, that of HD digital TV almost reaches to 700 lines. If the digital television adapting PDP or LCD rather than CRT was commercialized, screen quality could be improved thanks to MPEG2 and digital- signal process technology. In aspect of sound quality, current analog television provides just 2-channels of stereo sound, on the contrary, digital television sung AC3 technology provides 5.1-channel stereophonic sound which can only be enjoyed in public theater.

There is also big difference in width-height ratio of screen. Current television has 4 to 3 ratio for width to height, on the contrary, digital television has 16 to 9 ratio basically, the same ratio of theater screen.
There is a difference also in compatibility between digital television and analog one. Digital television is data-compatible by serial interface with let alone PC, digital multifunctional DVD player which processes signal in digital way, digital cam-coder, digital VCR.
But, rather than these factors, the more innovative meaning given to digital television is multimedia function that digital it provides, let alone internet search, home-banking, and so on, which enable diverse two-way additional functions.