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Related Concept Videos

Echo01:06

Echo

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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.
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,...
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Intensity and Pressure of Sound Waves01:05

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The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
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Sound as Pressure Waves01:17

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Perceiving Loudness, Pitch, and Location01:21

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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.
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Sound Intensity00:58

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Related Experiment Video

Updated: Mar 17, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
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Uncovering Spatial Variation in Acoustic Environments Using Sound Mapping.

Jacob R Job1, Kyle Myers2, Koorosh Naghshineh2

  • 1Department of Biological Sciences, Western Michigan University, Kalamazoo, MI, United States of America.

Plos One
|July 29, 2016
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Summary
This summary is machine-generated.

Acoustic habitats vary significantly even at small scales. Mapping sound pressure levels (SPLs) using 4-8 microphones effectively captures this variation in forest, prairie, and urban environments.

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Area of Science:

  • Ecology
  • Bioacoustics
  • Environmental Science

Background:

  • Animal habitat selection relies on environmental features, including acoustic characteristics.
  • The sound environment is a critical habitat feature for acoustically communicating animals, yet it is poorly understood.
  • Increasing anthropogenic noise impacts animal communication and detection of natural sounds.

Purpose of the Study:

  • To map spatial variation in acoustic habitats across terrestrial environments.
  • To determine the number of microphones needed to accurately capture acoustic variation.
  • To assess the impact of experimental noise on acoustic habitat mapping.

Main Methods:

  • Utilized microphone arrays to record sound pressure levels (SPLs) in forest, prairie, and urban habitats.
  • Collected data under ambient conditions and during experimental noise introductions.
  • Mapped SPLs across relevant spatial scales and analyzed data from varying numbers of microphones.

Main Results:

  • Significant spatial variation in SPLs was observed at small scales across all habitats, particularly in forests and urban areas.
  • Acoustic maps generated using 4-8 microphones closely approximated maps from larger arrays under ambient conditions.
  • Noise introductions increased map differences, with 4-microphone arrays showing greater deviation than those with 8 microphones.

Conclusions:

  • Acoustic environments exhibit considerable variation even at small spatial scales.
  • Acoustic mapping using a limited number of microphones (4-8) can effectively characterize habitat soundscapes.
  • Understanding spatial variation in soundscapes is crucial for assessing the impact of noise pollution on animal behavior and ecology.