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One of our Walmarts has anti-theft wheels
(lemmy.world)
None of the others in town have these, thought it was unusual enough to share
Right, but artifacts in the ~8khz range will be detectable by human hearing. mp3s are going to be perfectly acceptable for many sounds in that frequency range... The fact that this works is evidence of that.
Plus, you know what else is lossy? Radio. If the signal is that fragile there's a good chance the locking mechanism wouldn't work in the first place.
Go actually read about MP3 compression before you continue misusing the term "lossy."
It's just going to be pulses of an 8khz signal. Why would an MP3 not encode this just fine?
Like I said before, the coincidence is what's remarkable.
It’s a bit of a coincidence that the signal is in the audible range, for sure! I’m not too surprised that an MP3 can reproduce a digitally modulated sin wave in the audible spectrum, but I can see how it’s surprising to people that a sound card is basically a dinky low frequency SDR. Van Eck Phreaking is another good example of this kind of stuff. CRTs in particular produce very obvious emissions which match what’s being displayed.