Kids Don’t Realize Phones Have Vibrate Feature

A British paper is claiming that some no good punks have figured out a way to make their mobile phones inaudible to adults.

The theory is that since children have a greater capacity to hear high-pitched sounds, the ringtone will allow them to answer their phones with impunity in class. Which doesn’t make a lick of sense — even if your phone is inaudible (and that’s what vibrate is for), adults are still going to be suspicious when you loudly scream, “WHAZZUP, GIRLFRIEND! JUZ CHILLIN’ YOTE,” in the middle of Algebra class to nobody in particular. Then again, kids are idiots.

The ringtone is apparently modified from an anti-mosquito device. No one’s quite sure if it actually works, although there’s some people who wrote into Boing Boing swearing they couldn’t hear it but their slothful, lazy progeny could.

Pupils perform ‘alarming’ feat [Metro.co.uk]

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  1. Andrew W says:

    Was it actually an anti-mosquito device? I thought it was a device nicknamed the Mosquito that only kids could hear that adults would jack up to ear-piercing volume to keep kids from loitering, say, in your business’ parking lot.

    Also, you can hear phones vibrate, especially maybe if they’re against a textbook or set of keys.

    Also, in a crowded classroom kids probably text message, not vocally converse.

  2. Falconfire says:

    its true, there is a YTMND that has the sound on it as well. Funny enough, Im 25 and could hear it fine. Guess my hearings not that bad lol.

  3. matto says:

    This is sort of plausible; while the tiny piezo elements most phones use for ringers suck at playing your hip Lil’ Jon ringtone with any sort of crunky fidelity, they are exceptionally good at reproducing ultrasonic frequencies- which is why you’ll also find them in those bogus electronic mosquito repellents.

    That said, there is the issue of sampling rates, and Dr. Nyquist tells us that you need to sample at 2x the highest frequency you wish to reproduce. Over that line, you get what’s called aliasing noise, which appears at subharmonic frequencies. Basically, in encoding, you cut off anything above half the sampling rate.

    Assuming you’re encoding at 44.1khz (most consumer stuff does), this gives you recordings that top out at 22khz, well above the range of most adults, but within the range of Those Damned Kids.

  4. Paul D says:

    Hell. I can’t hear my OWN ringtone and it’s set at full volume.

    My wife is always saying “is that your phone?” And I’m like “is what my phone?”

    I’m halfway to Pete Townshend by now.

    Goddamn Rock & Roll…

  5. It’s an anti-teen device called the “Mosquito” sold by: http://www.compoundsecurity.co.uk/

    Apparently, it’s real…