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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Sound Waves01:01

Sound Waves

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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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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 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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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 as Pressure Waves01:17

Sound as Pressure Waves

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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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Development of an Audio-based Virtual Gaming Environment to Assist with Navigation Skills in the Blind
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WAVE: Interactive Wave-based Sound Propagation for Virtual Environments.

Ravish Mehra, Atul Rungta, Abhinav Golas

    IEEE Transactions on Visualization and Computer Graphics
    |September 11, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new wave-based sound system for realistic audio in virtual reality. The system enhances user navigation by providing accurate spatial sound for moving sources and listeners.

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    Area of Science:

    • Computer Graphics
    • Virtual Reality
    • Acoustics

    Background:

    • Realistic sound propagation is crucial for immersive virtual environments.
    • Existing methods struggle with dynamic sources/listeners and large-scale scenes.
    • Wave-based audio rendering offers high fidelity but faces computational challenges.

    Purpose of the Study:

    • To develop an interactive wave-based sound propagation system for dynamic virtual environments.
    • To enable accurate and realistic spatial audio for moving sources and listeners.
    • To improve computational efficiency compared to previous wave-based techniques.

    Main Methods:

    • A novel algorithm combining precomputation and GPU-based runtime evaluation to solve the wave equation.
    • Implementation within the Half-Life 2 game engine, supporting Oculus-Rift and Xbox controllers.
    • Handling of large environments, listener motion (head tracking), and directional sources at interactive rates.

    Main Results:

    • Significant improvements in runtime memory usage compared to prior wave-based methods for large, dynamic scenes.
    • Successful integration and demonstration of high-quality acoustic effects (diffraction, scattering) and spatial audio.
    • Interactive performance enabling real-time audio rendering for VR applications.

    Conclusions:

    • The developed system provides accurate, realistic, and interactive sound propagation in complex virtual environments.
    • Wave-based acoustic effects and spatial audio positively impact user navigation performance in VR.
    • The system offers a computationally efficient solution for high-fidelity audio in VR.