Infrasonic noise

Professional Definition

Noise containing sounds from 1 Hz to 50 Hz.

These are acoustic waves of very long length (even several meters), located at or below the threshold of human hearing. Although we often do not hear them as tones, they are registered by the body and can cause the phenomenon of resonance in body structures. In measurements of this type of noise, correction curve G is often used instead of the standard curve A.

Acoustics in Simple Words

Imagine standing next to a powerful bass speaker at a concert. Even if you plug your ears, you can feel how your chest vibrates. This is the effect of low frequencies. Infrasonic noise is like an invisible rocking of a boat at sea – you do not hear the waves (unlike high sounds), but your entire vestibular system and body feel this slow, powerful movement, which can lead to fatigue and even nausea.

Summary

Infrasonic noise encompasses the lowest frequency range, often generated by wind turbines, heavy construction equipment, or ventilation systems. Its nuisance arises more from the vibrational impact on the body than from auditory sensations.