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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...

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...

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...

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...

Echo

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...

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.

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Related Experiment Video

Updated: Nov 7, 2025

Photorealistic Learned Landscapes for Augmented Reality

Photorealistic Learned Landscapes for Augmented Reality

Published on: June 27, 2025

Speech intelligibility in a realistic virtual sound environment.

Naim Mansour¹, Marton Marschall¹, Tobias May¹

¹Hearing Systems Section, Department of Health Technology, Technical University of Denmark, Kongens Lyngby, Denmark.

The Journal of the Acoustical Society of America

|May 4, 2021

Summary

This study evaluated speech intelligibility in realistic virtual sound environments. Hearing-impaired individuals showed higher speech reception thresholds in complex soundscapes compared to artificial noise.

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Area of Science:

Audiology
Acoustics
Human-Computer Interaction

Background:

Hearing aid users face challenges in understanding speech in everyday noisy environments.
Realistic acoustic simulations are needed to accurately assess speech intelligibility.

Purpose of the Study:

To evaluate speech intelligibility in a controlled, realistic virtual sound environment (VSE).
To compare speech reception thresholds (SRT) in realistic versus artificial noise conditions.
To assess speech recognition scores (SRS) at a relevant signal-to-noise ratio (SNR).

Main Methods:

Defined "critical sound scenarios" using ecological momentary assessment.
Acquired real-world soundscapes with a spherical microphone array.
Reproduced soundscapes in a loudspeaker-based VSE using Ambisonics.
Measured SRT and SRS for normal-hearing (NH) and hearing-impaired (HI) listeners.

Main Results:

SRTs were significantly higher in the realistic VSE for both NH and HI listeners compared to artificial noise.
Realistic backgrounds likely increased modulation masking and cognitive load.
SRSs in realistic conditions correlate with real-world listening challenges.

Conclusions:

Virtual sound environments offer a more ecologically valid method for testing speech intelligibility.
Hearing impairment significantly impacts speech understanding in realistic acoustic conditions.
The VSE approach can better predict real-world listening difficulties for hearing aid users.