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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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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

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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Sound Intensity Level00:53

Sound Intensity Level

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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...
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Sound Waves: Interference00:53

Sound Waves: Interference

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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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Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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Related Experiment Video

Updated: Jul 9, 2025

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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Multidimensional comparison of underwater soundscapes using the soundscape codea).

Dylan C Wilford1,2,3, Jennifer L Miksis-Olds1, S Bruce Martin4

  • 1Center for Acoustics Research and Education, University of New Hampshire, Durham, New Hampshire 03824, USA.

The Journal of the Acoustical Society of America
|November 28, 2023
PubMed
Summary
This summary is machine-generated.

Marine soundscapes reveal habitat differences. Shallow coral reefs are acoustically distinct from deep-sea environments, providing baseline data for the U.S. Outer Continental Shelf.

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Area of Science:

  • Marine bioacoustics
  • Deep-sea ecology
  • Habitat characterization

Background:

  • Soundscapes offer insights into ecosystem processes, habitat quality, and biodiversity.
  • Shallow coral reefs are biodiverse, while deep-sea coral environments remain poorly understood.
  • Acoustic data can differentiate habitats based on physical and biological characteristics.

Purpose of the Study:

  • To acoustically quantify and compare soundscapes from diverse marine habitats.
  • To explore how habitat, depth, and substrate influence soundscape properties.
  • To establish baseline acoustic data for deep-sea environments on the U.S. Outer Continental Shelf.

Main Methods:

  • Quantification of soundscapes from four U.S. Outer Continental Shelf locations and one from the Great Barrier Reef.
  • Application of soundscape coding to analyze acoustic metrics and daily trends.
  • Cluster analyses to compare soundscape properties across different habitat types (shallow vs. deep, coral vs. sandy bottom).

Main Results:

  • The shallow, tropical reef soundscape showed distinct differences in amplitude and impulsiveness compared to deep-sea soundscapes.
  • Deep-sea soundscapes varied, with cold-water coral sites exhibiting unique acoustic properties compared to non-coral deep-sea sites.
  • Acoustic metrics successfully differentiated between shallow and deep-sea habitats, as well as between coral and sandy substrates.

Conclusions:

  • Soundscape analysis provides a valuable tool for characterizing and differentiating marine habitats.
  • Deep-sea soundscapes, particularly those from cold-water corals, possess unique acoustic signatures.
  • This study establishes crucial baseline acoustic data for the U.S. Outer Continental Shelf, essential for monitoring future environmental changes.