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Related Concept Videos

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: Resonance01:14

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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...
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Sound Waves: Interference00:53

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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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In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
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Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Related Experiment Video

Updated: Jul 22, 2025

Ultrasound Images of the Tongue: A Tutorial for Assessment and Remediation of Speech Sound Errors
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Speech Intelligibility in Reverberation is Reduced During Self-Rotation.

Ľuboš Hládek1, Bernhard U Seeber1

  • 1Audio Information Processing, Technical University of Munich, Munich, Germany.

Trends in Hearing
|July 21, 2023
PubMed
Summary

People naturally rotate to improve speech understanding in noisy environments. Visual cues enhance self-rotation accuracy and speech intelligibility, though overall intelligibility slightly decreases during self-rotation.

Keywords:
head rotationspatial unmaskingspeech intelligibility modelspeech understanding

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Area of Science:

  • Auditory Perception
  • Human Behavior
  • Acoustic Signal Processing

Background:

  • Traditional studies of speech intelligibility in noisy environments assume stationary participants and sound sources.
  • Active self-rotation by participants introduces dynamic spatial considerations.
  • Understanding adaptive behaviors in complex auditory scenes is crucial.

Purpose of the Study:

  • To investigate if individuals spontaneously rotate to optimize speech intelligibility in a spatialized auditory environment.
  • To determine the benefit of visual cues (avatar) in guiding self-rotation and improving speech perception.
  • To compare speech intelligibility during self-rotation versus a static condition.

Main Methods:

  • Participants performed a spatialized speech test involving self-rotation towards auditory targets.
  • Speech stimuli were presented from different locations (0°, ±90°, 180°) with frontal noise (0°).
  • Conditions included audio-only, audio-visual (with avatar), and a static baseline.

Main Results:

  • Participant self-orientations undershot target locations but were near acoustically optimal.
  • Speech intelligibility was higher in the audio-visual condition compared to audio-only for lateral targets.
  • Intelligibility improved for rear targets during self-rotation but decreased for lateral targets compared to static, partly due to spatial unmasking.

Conclusions:

  • Speech intelligibility is generally reduced during self-rotation compared to static conditions.
  • Visual location cues facilitate more accurate self-rotations and enhance speech intelligibility.
  • Current models of static spatial unmasking may overestimate performance in dynamic self-rotation scenarios.