03:07
I’m sure you’ve heard of that old news about an Adult-Proof Ringtone [APR]. Well, if you haven’t, allow me to briefly explain: to put it simply, it’s a ringtone that adults over 25 [more or less] can’t hear, but anyone younger will be able to hear a high-pitch sound that goes NGIIIIIIIIIINGGG!~~ I’m sure you know what kind of buzzing I’m talking about. It’s kinda like a mosquito buzzing, but at a much higher frequency, and at lower volume.
Anyway, it’s really not that difficult to produce this sound. A simple circuit with a buzzer does the trick, I remember doing an assignment that could do that. Most classic Cathode Ray Tube [CRT] television sets produce this sort of high-pitched noise too but at a much lower frequency than the APR. I’ve been able to tell if the TV was switched on or off from anywhere in the house just by hearing this noise. It’s not much of a big deal, really, since anyone else could also probably hear it too so I never told anyone about it. The thing is, while everyone in the house could probably hear it, I was the only one who paid attention and actually listened for it.
This was a neat trick for me back in my teenage days [geez, and I'm still only 22!] since I was able to tell if anyone was awake watching TV late at night before I snuck out of my room and out the house. If I hear that NGIIIIING noise, I would slip back into my room and wait a while longer until the noise died away - signalling that the TV has been switched off, and whoever was watching back then has most likely gone to bed.
Today, I can still hear that buzz, but it’s not something I really bothered with because now I simply walk out of the house for late night mamaking and just tell my mom I was going out as I pass them by [at this age, going out late at night isn't much of a problem anymore, thankfully]. However, my paying attention to that silent noise has somewhat backfired on me.

