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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...
Sound Waves: Interference00:53

Sound Waves: Interference

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...
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Effective Value of a Periodic Waveform01:07

Effective Value of a Periodic Waveform

The concept of effective value, the root mean square (RMS) value, is crucial in understanding electrical circuits and power delivery. This idea emerges from the necessity to measure the effectiveness of a voltage or current source in supplying power to a resistive load.
The effective value of a periodic current represents the direct current (DC) that conveys the same average power to a resistor as the periodic current itself. This concept is crucial when assessing AC circuits. To determine the...
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...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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New Framework for Understanding Cross-Brain Coherence in Functional Near-Infrared Spectroscopy (fNIRS) Hyperscanning Studies
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Interaural coherence for noise bands: waveforms and envelopes.

Neil L Aaronson1, William M Hartmann

  • 1Department of Physics and Astronomy, Biomedical and Physical Sciences Building, Michigan State University, East Lansing, Michigan 48824, USA. neil.aaronson@stockton.edu

The Journal of the Acoustical Society of America
|March 25, 2010
PubMed
Summary
This summary is machine-generated.

Researchers discovered a formula linking waveform coherence and envelope coherence in noise bands. This finding allows for predicting envelope coherence from waveform coherence with high accuracy.

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Area of Science:

  • Acoustics
  • Psychoacoustics
  • Signal Processing

Background:

  • Interaural coherence is crucial for sound localization.
  • Understanding the relationship between waveform and envelope coherence can improve audio processing and hearing aid technology.

Purpose of the Study:

  • To establish a formulaic relationship between interaural waveform coherence (gamma(W)) and interaural envelope coherence (gamma(E)) for a band of noise.
  • To validate this relationship through both computational simulations and real-world binaural measurements.

Main Methods:

  • Computer simulations were used to model the relationship.
  • Binaural measurements were conducted using a KEMAR manikin in two different room environments.
  • Statistical analysis was performed to determine the reliability of the derived formula.

Main Results:

  • A predictive formula, gamma(E)=pi/4+(1-pi/4)(gamma(W))(2.1), was identified.
  • The formula demonstrated consistent accuracy across both simulated and real-world acoustic conditions.
  • Room acoustics measurements provided a reliability measure for the predictive formula.

Conclusions:

  • A quantifiable relationship exists between interaural waveform and envelope coherence for noise bands.
  • The derived formula enables reliable prediction of envelope coherence when waveform coherence is known.
  • This research offers a valuable tool for applications in audio engineering and auditory perception research.