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Without going into the fundamentals of analog and digital data transmission methods, a digital transmission can contain a higher amount of data than an analog transmission within the same frequency range.

The change from analog TV to digital TV allows the content providers to have multiple TV stations per channel. Like say channel 13 use to have just the broadcast of one program in analog, but now there is more space, or bandwidth, to broadcast 3 or 4 programs on the same channel. 13.1, 13.2 and so on. Really the limit is how low of quality video the content provider wants to broadcast at. It's like changing the setting on YouTube from 240p to 1080p. 240p loads faster than 1080p, but 1080p looks better.

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