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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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...
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Echo01:06

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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.
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The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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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.
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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: Mar 30, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Near-Field Sound Localization Based on the Small Profile Monaural Structure.

Youngwoong Kim1, Keonwook Kim2

  • 1Division of Electronics & Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, Korea. herokim@dongguk.edu.

Sensors (Basel, Switzerland)
|November 19, 2015
PubMed
Summary

This study introduces a novel near-field sound localizer using a single microphone and a unique asymmetric structure. The system achieves a 78% overall hit rate for sound source localization up to 15 cm.

Keywords:
Cepstrumacoustic resonanceangle of arrivalcylindrical pipefundamental frequencymonaural localizationnear-fieldsingle microphonesound localization

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Area of Science:

  • Acoustics
  • Signal Processing
  • Sensor Technology

Background:

  • Near-field acoustic waves exhibit complex temporal, spectral, and spatial properties.
  • Traditional sound localization methods face challenges in confined or near-field environments.

Purpose of the Study:

  • To develop and validate a compact, single-microphone near-field sound localizer.
  • To leverage asymmetric structural features for directional sound identification.

Main Methods:

  • A physical structure with ten pipes of varying lengths and radial wings was designed.
  • A modified Cepstral parameter was used to estimate the fundamental frequency generated by acoustic resonance.
  • A dedicated algorithm derived the length and angle of arrival (AoA) from the estimated fundamental frequency.

Main Results:

  • The system demonstrated directional localization capabilities using spectral variations induced by the asymmetric structure.
  • Extensive acoustic experiments with a 3D-printed model yielded average hit rates of 89% for direct paths and 73% for side paths.
  • Localization accuracy increased at closer distances, achieving an overall 78% hit rate up to 15 cm.

Conclusions:

  • The proposed single-microphone near-field sound localizer effectively utilizes structural asymmetry for directional sound identification.
  • The system shows promise for compact acoustic sensing applications requiring precise near-field localization.
  • Further research can explore optimizations for enhanced accuracy and extended range.