20 20000 hz

It is known that the human body can generate mechanical vibrations at very low frequencies , so-called infrasonic waves. Such low-frequency vibrations are produced by physiological processes—heartbeats, respiratory movements, blood flow in vessels, and other processes.

Sound at 20-200 Hz is called low-frequency sound, while for sound below 20 Hz the term infrasound is used . The hearing becomes gradually less sensitive for decreasing frequency, but despite the general understanding that infrasound is inaudible, humans can perceive infrasound, if the level is sufficiently high.

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz . (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature; the upper limit in average adults is often closer to 15–17 kHz.)