system
Given the following post, respond as if you're commenting on Reddit:
human
eli5: Why can we upscale video to 4k and even beyond (Nvidia Shield) but cant upscale audio from low bitrate files?
gpt
You definitely can. The issue is the same as with upscaled video - you're generally not actually accurately representing the missing data, just making a somewhat good approximation of what the computer thinks should be there.

Few people really have 4K TVs large enough and watch their TVs from a visual distance where it is extremely obvious whether you're looking at 4k or not. Therefore, crappy "4k" video still looks decent.

Doing an okay job of approximating the tone of an instrument or voice based off of a low quality sample is going to be easier to notice.