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Related Concept Videos

Sound Waves01:01

Sound Waves

13.0K
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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Sound Waves: Resonance01:14

Sound Waves: Resonance

3.4K
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...
3.4K
Sound as Pressure Waves01:17

Sound as Pressure Waves

4.5K
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...
4.5K
Perception of Sound Waves01:01

Perception of Sound Waves

5.7K
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...
5.7K
Sound Waves: Interference00:53

Sound Waves: Interference

4.7K
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...
4.7K
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

1.7K
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...
1.7K

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Two-dimensional multizone sound field reproduction using a wave-domain method.

Zerui Han1, Ming Wu1, Qiaoxi Zhu2

  • 1Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of the Acoustical Society of America
|November 15, 2018
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Summary

This study introduces a novel wave-domain method for two-dimensional multizone sound field reproduction. The approach enhances acoustic contrast and array gain, offering improved performance over conventional techniques.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Wave Physics

Background:

  • Multizone sound field reproduction aims to control sound in specific areas.
  • Conventional methods like acoustic contrast control face limitations in performance and parameter sensitivity.

Purpose of the Study:

  • To develop an improved two-dimensional multizone sound field reproduction method.
  • To enhance acoustic contrast and array gain in targeted sound zones.
  • To reduce sensitivity to regularization parameters in wave-domain sound control.

Main Methods:

  • A two-dimensional multizone sound field reproduction approach is proposed.
  • The method utilizes a wave-domain technique with orthogonal basis functions.
  • Loudspeaker weights are determined by maximizing inter-zone acoustic contrast.

Main Results:

  • The proposed wave-domain method significantly improves acoustic contrast.
  • Enhanced array gain is achieved across the entire control region.
  • The method demonstrates reduced sensitivity to the regularization parameter compared to conventional approaches.

Conclusions:

  • The novel wave-domain method offers superior performance for multizone sound field reproduction.
  • This approach provides better control over sound fields in bright and dark zones.
  • The technique is more robust and less dependent on parameter tuning.