DTV is a new digital television standard that replaces standard-definition television broadcasts. It works like this:
- The broadcasters that you are familiar with have all been assigned new channels for their digital broadcasts.
- DTV signals use the MPEG-2 compression standard, and they are transmitted via a 19.39-Mbps digital data stream.
- DTV broadcasts can be transmitted at different resolutions:
- 480p: 60 complete frames per second and 704 by 480 scan lines.
- 720p: 60 complete frames per second and 1280 by 7200 scan lines.
- 1080i - 30 complete frames per second (60 interlaced frames a second) and 1920 by 1080 scan lines.
A broadcaster can use the entire 19.39-Mbps stream to transmit several different channels at 480p or one 1080i high-definition signal.
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