Translations:Sonification in practice/94/en

The human hearing is able to sense tones between 20 Hz and 20000 Hz (this range is unique to each one and usually gets smaller with age). The vibrations of pressure with frequencies lower than 20 Hz or higher than 20000 Hz are inaudible. They are called infrasounds and ultrasounds respectively. We do not hear them but we still can sense them, with the touch sense in the case of infrasound and with temperature sense in the case of ultrasound.