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Perception of Sound Waves

Perception of Sound Waves

The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...

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.

Assessment of the Cardiovascular System IV: Auscultation

Assessment of the Cardiovascular System IV: Auscultation

Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

Physical Assessment of the Respiratory Tract IV: Auscultation

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.

Heart Sounds

Heart Sounds

Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...

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Related Experiment Video

Updated: May 25, 2026

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

Published on: March 13, 2026

Study on self hearing assessment using speech sounds.

Junil Sohn¹, Dongwook Kim, Yunseo Ku

¹Samsung Advanced Institute of Technology, Korea. i.sohn@samsung.com

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This summary is machine-generated.

A new mobile phone hearing test accurately assesses hearing loss. Compensation features based on test results significantly improve speech understanding for individuals with hearing impairments.

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Area of Science:

Audiology
Mobile Health Technology
Assistive Technology

Background:

Hearing loss affects millions globally, impacting communication and quality of life.
Traditional hearing assessments can be inaccessible or inconvenient.
Mobile devices offer a potential platform for accessible hearing health solutions.

Purpose of the Study:

To develop and validate a novel self-assessment tool for hearing loss using mobile phones.
To implement a hearing compensation function based on the self-assessment results.
To evaluate the effectiveness of the proposed system in improving speech intelligibility.

Main Methods:

Development of a user-friendly hearing screening application for mobile phones.
Implementation of an algorithm to analyze hearing test results and generate personalized compensation settings.
Conducting experiments with hearing-impaired individuals to assess speech intelligibility before and after compensation.

Main Results:

The mobile phone-based hearing test demonstrated sufficient accuracy in identifying hearing loss.
Personalized audio compensation significantly enhanced speech intelligibility for participants.
The system proved effective in providing a practical solution for hearing-impaired users.

Conclusions:

Mobile phones can serve as effective tools for self-assessing hearing loss.
The developed compensation function offers a viable method to improve communication for the hearing impaired.
This technology has the potential to increase accessibility to hearing healthcare solutions.