this post was submitted on 18 Mar 2025
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[–] [email protected] 3 points 2 days ago (8 children)

You know why vhs quality degraded with every generation of copy? It wasn't an accident or a technical problem, it was deliberate.

They want to discourge people from copying their tapes, so there was a mechanism in the VCR to actually cause some drop in quality when you taped something.

This is why TV tapings of a movie would never be as good as buying/renting the same movie from a store. Even if you used a virgin tape.

[–] [email protected] 11 points 2 days ago (3 children)

No, it was really a technical issue. Analog signals are very prone to noise, and noise is cumulative. Even the best recording heads are going to pick up stray magnetic fields, and of course you get the typical cosmic ray noise hitting the recording tape and head, and then there's noise in power lines that also contribute to the noise.

Basically, what you don't get to hear anymore causes it: Tune an older radio to somewhere between stations. The static exists all the time. If it didn't, it would just be no noise at all, rather than static. Same with older, analog TVs: You see snow and hear static. That's all environmental noise, which will impact analog recording medium. Even the source side of the house gets that noise introduced. That's what Signal-to-noise ratio means: How much signal, vs how much noise exists.

So, dupe of a dupe of a dupe... All recording noise.

[–] [email protected] 1 points 2 days ago (1 children)

And it still happens even with digital technology. If you, say, rotate a .jpg file a few thousand times, the image will start to degrade as it doesn't perfectly copy over everything and the very slight losses start to add up.

[–] [email protected] 3 points 2 days ago

Somewhat different issue there. JPEG compression is lossy. It doesn't happen on a BMP. Though you can probably link the two up with underlying information theory.

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