Standard definition digital allows more channels.
Standard Definition Digital Television (SDTV)
Broadcasters have had reservations about HDTV because it costs a lot of money to convert to it and they have seen no apparent way to increase their revenues to recover that additional cost. With the development of high-quality digital compression, it is now possible to digitize the standard NTSC video signal and compress it so that four or more signals can fit into one standard NTSC 6-MHz bandwidth channel. This is what happens if you have one of those small mini-dish home satellite systems or digital cable. They send you multiple channels of digital video that have been compressed into one 6-MHz bandwidth. Your set-top receiver converts it to NTSC ...
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