Digital television

Digital television or DTV is a kind of television that uses digital modulation and compression to broadcast video signal, voice, and data to the television. Digital television is a tool used to capture digital TV broadcasting, the development of analog to digital broadcast system that converts the information into digital signal form of bits of data

Digital TV Frequency
Technically, the tape of the radio frequency spectrum used for analogue television can be used for digital television broadcasting. Comparison of bandwidth used analog technology to digital technology is one: 6. So, when analog technology requires 8 MHz bandwidth for a single transmission channel, digital technology with the same bandwidth (using the technique of multiplex) can emit as much as six to eight channels transmitting simultaneously to different programs.

Digital TV transmitter systems
There are three standard digital television transmitter systems in the world, the digital television (DTV) in the United States, terrestrial digital video broadcasting (DVB-T) in Europe, and integrated service digital broadcasting terrestrial (ISDB-T) in Japan. All standards-based digital system transmitter system coding OFDM system with MPEG-2 sound code for the ISDB-T and DTV as well as MPEG-1 for DVB-T.

The advantages of digital TV frequencies
Broadcast using a digital system to have robustness against disturbances and easy way to repair digital codes via error correcting codes. The result is picture quality and sound are far more accurate and higher resolution than analog television broadcasts. In addition to digital television broadcasts using low power.

Source : www.wikipedia.com