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Related Concept Videos

Sound Waves01:01

Sound Waves

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. Hence,...
Sound Intensity00:58

Sound Intensity

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 emitted...
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

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 and...
Sound as Pressure Waves01:17

Sound as Pressure Waves

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...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Energy Carried By Electromagnetic Waves01:22

Energy Carried By Electromagnetic Waves

Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...

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The diffuse sound field in energetic analysis.

Giovanni Del Galdo1, Maja Taseska, Oliver Thiergart

  • 1Audio Department, Fraunhofer Institute for Integrated Circuits, Am Wolfsmantel 33, 91058 Erlangen, Germany. giovanni.delgaldo@iis.fraunhofer.de

The Journal of the Acoustical Society of America
|March 20, 2012
PubMed
Summary
This summary is machine-generated.

This study compares sound field diffuseness estimators for spatial audio, finding similar performance despite practical noise and averaging. A new estimator and spatial averaging techniques are introduced to enhance temporal resolution.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Spatial Audio

Background:

  • Diffuseness measurement is key for modern spatial audio.
  • Intensity-based estimators offer dual benefits for sound intensity and directionality.
  • Practical conditions involve noisy microphones and temporal averaging.

Purpose of the Study:

  • To review and compare existing diffuseness estimators.
  • To evaluate estimator performance under realistic noisy conditions.
  • To introduce a novel diffuseness estimator and spatial averaging technique.

Main Methods:

  • Comparative analysis of various diffuseness estimators.
  • Simulation and/or experimental validation under noisy conditions.
  • Derivation of a new intensity-based diffuseness estimator.

Main Results:

  • Most intensity-based diffuseness estimators exhibit comparable performance.
  • Each estimator presents unique trade-offs based on specific application scenarios.
  • The proposed spatial averaging method can improve temporal resolution.

Conclusions:

  • Intensity-based diffuseness estimation is viable for practical spatial audio.
  • The choice of estimator depends on specific environmental and system constraints.
  • Novel methods can enhance the accuracy and temporal characteristics of diffuseness estimation.