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Mosquito Tone Audibility TestBackgroundFrequency-wise, our hearing ability ranges from 20Hz up to 20.000Hz (please refer to our high-frequency extension audio test to give your hearing ability a test). As we get older, the 20k upper limit decreases: this phenomenon is medically known as presbycusis. Therefore, it is possible to generate high frequencies that are audible only to teenagers. Since these high pitched sounds are uncomfortable to withstand, they can be used - for example - to repel loitering teenagers in the street.
The filesA -3dbFS steady sine tone at 17.4kHz and its modulated version oscillating between [17kHz-20kHz] with a 3Hz modulation speed.
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