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Related Concept Videos

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 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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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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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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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 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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Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
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It is too loud!

William A Yost1

  • 1Spatial Hearing Laboratory, College of Health Solutions, Arizona State University, Post Office Box 870102, Tempe, Arizona 85287, USA.

The Journal of the Acoustical Society of America
|September 3, 2020
PubMed
Summary
This summary is machine-generated.

This series revisits impactful historical acoustics research from The Journal of the Acoustical Society of America. It highlights key contributions to the science and practice of acoustics.

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Area of Science:

  • Acoustics
  • Sound Science
  • Vibrational Physics

Background:

  • The Journal of the Acoustical Society of America (JASA) has a long history of publishing significant research.
  • Understanding the historical trajectory of acoustics is crucial for current scientific advancement.

Purpose of the Study:

  • To examine seminal articles within JASA.
  • To assess the lasting impact of these articles on acoustics research and application.

Main Methods:

  • Literature review of historical JASA publications.
  • Analysis of citation impact and thematic trends.

Main Results:

  • Identification of key papers that have shaped the field.
  • Demonstration of the evolution of acoustic principles and technologies.

Conclusions:

  • Historical JASA articles provide foundational knowledge for modern acoustics.
  • Continued study of historical research informs future innovations in sound science.