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Related Concept Videos

Echo01:06

Echo

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, then the...
Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Basic Operations on Signals01:22

Basic Operations on Signals

Basic signal operations include time reversal, time scaling, time shifting, and amplitude transformations. These operations are fundamental in signal processing and analysis.
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Related Experiment Video

Updated: Jun 26, 2026

A Method to Study Adaptation to Left-Right Reversed Audition
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A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Time-forward speech intelligibility in time-reversed rooms.

Laricia Longworth-Reed1, Eugene Brandewie, Pavel Zahorik

  • 1Department of Psychological and Brain Science, University of Louisville, Louisville, Kentucky 40292, USA.

The Journal of the Acoustical Society of America
|January 29, 2009
PubMed
Summary

Reversing room acoustics in virtual auditory space significantly impaired word recognition. Speech intelligibility dropped from 89% to 25%, a finding not explained by standard acoustic models.

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Area of Science:

  • Auditory Neuroscience
  • Acoustic Signal Processing
  • Speech Perception

Background:

  • Understanding speech intelligibility in complex acoustic environments is crucial.
  • Virtual auditory space (VAS) techniques allow for precise control over acoustic parameters.
  • Temporal manipulation of room acoustics offers a novel approach to studying auditory perception.

Purpose of the Study:

  • To investigate the impact of time-reversed room acoustics on word recognition abilities.
  • To determine if temporal manipulation of acoustics affects speech intelligibility.
  • To explore the underlying mechanisms of speech perception in altered acoustic conditions.

Main Methods:

  • Utilized virtual auditory space (VAS) techniques to simulate two acoustical conditions: time-forward and time-reversed.
  • Temporal manipulation of room acoustics was performed independently of speech source signals.
  • Word recognition abilities were assessed under both acoustical conditions.

Main Results:

  • A significant decrease in speech intelligibility was observed in the time-reversed condition (from 89% to <25%).
  • The observed degradation in speech intelligibility was not predictable by standard modulation transfer function (MTF) methods.
  • Time-reversed acoustics may degrade crucial onset information in speech signals.

Conclusions:

  • Time-reversed room acoustics severely impair word recognition.
  • Standard acoustic models may not fully capture the effects of temporal acoustic manipulations on speech intelligibility.
  • Degradation of speech onset information is a potential factor in reduced intelligibility under time-reversed conditions.