Period
- Input
- 1000000 / 17000
- Expected output
- 58,8 microssegundos
Time of one cycle.
Carregando ferramenta… / Loading tool…
mosquito tone 17 khz
The test passes through 16, 17 and 18 kHz among its steps, one ear at a time, with the frequency hidden until the end. On the final chart you see whether 17 kHz was identified or you stopped before it.
Time of one cycle.
At 20 degrees.
Nyquist requires more than 2.
Chance of guessing 17 kHz right: 25%.
The test plays nothing higher.
It plays pure tones at 1 kHz (check) and then 8 to 20 kHz in one ear at a time. Each trial has two intervals of about one second, with three short tone pulses in only one of them, chosen at random. You answer in which one you heard the tone. Two correct answers unlock the next frequency; a wrong answer or an "I heard nothing" ends that ear, and the last frequency you got right becomes the result.
Because sensitivity to high pitches drops with age and accumulated noise, and 17 kHz is near the end of the audible range. There is no exact age at which the sound vanishes, and many people over 30 still perceive it in silence.
Not always. Small speakers roll off a lot above 15 to 16 kHz. With good headphones the chance is better. To find out whether the headphones are the limit, repeat the test with another pair or another device.
A whine that stays in both intervals is not the test tone, which appears in only one. It may be device noise or ringing in your ears. If it is persistent ringing, see a doctor.