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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

2.5K
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.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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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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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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Sound Intensity00:58

Sound Intensity

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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...
4.1K
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

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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.
Unlike the time average of a sinusoidal term, which is zero since it is positive...
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Sound Waves01:01

Sound Waves

9.3K
Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Semi-Automated Analysis of Peak Amplitude and Latency for Auditory Brainstem Response Waveforms Using R
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How to analyse and represent quantitative soundscape data.

Andrew Mitchell1, Francesco Aletta1, Jian Kang1

  • 1University College London, London, United Kingdom andrew.mitchell.18@ucl.ac.uk, f.aletta@ucl.ac.uk, j.kang@ucl.ac.uk.

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Summary
This summary is machine-generated.

Existing soundscape analysis methods struggle to summarize location and group responses. This study introduces a new approach and open-source tool for a more nuanced understanding of urban soundscapes.

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Area of Science:

  • Environmental acoustics
  • Urban planning
  • Psychoacoustics

Background:

  • Current soundscape analysis methods, such as those in ISO 12913, face limitations in effectively summarizing diverse human responses to auditory environments.
  • Existing standards may not adequately capture the variability of perceptions within specific locations or across different groups.
  • A need exists for more sophisticated tools to analyze and represent complex soundscape data.

Purpose of the Study:

  • To evaluate the effectiveness of ISO 12913 soundscape analysis methods using a large dataset.
  • To address the identified limitations in summarizing soundscape data for locations and groups.
  • To introduce an open-source visualization tool for nuanced soundscape assessment and urban design.

Main Methods:

  • Application of ISO 12913 analysis methods to a substantial database of soundscape assessments.
  • Development of a novel approach that accounts for response variability within groups.
  • Creation of an open-source visualization tool for soundscape data.

Main Results:

  • The study confirmed the limitations of standard ISO 12913 methods in summarizing soundscape data for locations and groups.
  • The developed approach successfully incorporates the diversity of responses within assessment groups.
  • Demonstrations showcase the soundscape distribution in various urban spaces using the new tool.

Conclusions:

  • Standard soundscape analysis methods require enhancement to capture the complexity of auditory environments.
  • The proposed open-source tool offers a more nuanced approach to soundscape assessment and urban design.
  • Further development and application of this visualization tool can improve urban soundscape planning and management.