With digital television (DTV), picture and sound transmissionis exclusively digital and is based on the DigitalVideoBroadcasting( DVB) standard. Digital TV is characterized by improved picture and sound quality, provides access to more channels, and offers return channels for additional services such as Internet access via set-top boxes and as an electronic program guide, the Electronic Program Guide( EPG).
The DTV standard has a bandwidth of 6 MHz for the transmission of video, audio, auxiliary and control data. With this channel width, data rates of 19 Mbit/s are achieved for terrestrial transmission and as high as 38 Mbit/s for transmission in broadband cable networks. In transmission, digital TV consistently relies on data reduction methods and uses MPEG-2 as the compression method. These methods serve frequency economy and enable the transmission of very high data rates on much smaller bandwidths. As a result, more channels of digital TV can be transmitted over the same frequency band for the same bandwidth, which is otherwise only available to one analog TV channel.
Digital TV comes in a variety of formats, ranging in resolution from 1,920 x 1,080 pixels for high-definition television( HDTV) , through studio-quality enhanced definition television( EDTV) and standard definition television( SDTV) in standard quality, to 376 x 282 pixels for low definition television ( LDTV). The image resolution with 1,920 x 1,080 pixels is referred to as Full HD. The Multimedia Home Platform( MHP) serves as a uniform standardized operator platform.
In the USA, digital TV is referred to as Advanced Television (ATV). The designation refers equally to digital transmission technology and also to high-definition HDTV.