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Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

Auditory Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...

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Related Experiment Video

Updated: Jul 3, 2026

A Low Cost Setup for Behavioral Audiometry in Rodents

A Low Cost Setup for Behavioral Audiometry in Rodents

Published on: October 16, 2012

Pure tone audiometry with and without specific ear protectors.

Carlos Antonio Rodrigues de Faria¹, Fabio Akira Suzuki

¹IAMSPE, Brazil.

Brazilian Journal of Otorhinolaryngology

|July 29, 2008

Summary

This study measured sound attenuation from earplugs using pure tone audiometry. Results confirmed the earplugs provided sound reduction consistent with manufacturer specifications.

Area of Science:

Audiology
Occupational Health

Background:

Hearing protection devices are crucial in preventing noise-induced hearing loss.
Evaluating the real-world effectiveness of earplugs is essential for workplace safety.

Purpose of the Study:

To measure the sound attenuation level provided by specific earplugs.
To compare audiometric results with and without earplug use.

Main Methods:

A case control study involving 30 subjects (60 ears) with normal hearing.
Pure tone audiometry was conducted at frequencies from 500 to 4000 Hz.
Audiometric results were analyzed with and without specific ear protectors.

Main Results:

The sound reduction provided by the earplugs was statistically analyzed.

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Results were compared against the manufacturer's stated specifications.

Conclusions:

The tested earplugs demonstrated sound reduction performance aligning with manufacturer claims.
This validates the efficacy of these earplugs in attenuating sound as specified.