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Related Concept Videos

Interference: Path Lengths01:10

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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...
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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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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Related Experiment Video

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A Low Cost Setup for Behavioral Audiometry in Rodents
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Interaural-phase discrimination in notched noise.

Marc Nitschmann1, Jesko L Verhey1

  • 1Department of Experimental Audiology, Otto von Guericke University Magdeburg, Leipziger Strasse 44, 39120 Magdeburg, Germany.

The Journal of the Acoustical Society of America
|November 7, 2014
PubMed
Summary
This summary is machine-generated.

Just-noticeable differences in interaural-phase difference (IPD) were measured for a 500-Hz tone. Wider noise notches increased IPD thresholds, suggesting broader auditory filters.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Interaural phase difference (IPD) is crucial for sound localization.
  • Understanding how masker characteristics affect IPD perception is important for auditory models.

Purpose of the Study:

  • To investigate the impact of notch width in a diotic masker on IPD discrimination thresholds.
  • To evaluate the consistency of experimental data with the equalization-cancellation theory.

Main Methods:

  • Measured IPD discrimination thresholds for a 500-Hz sinusoid.
  • Used a diotic notched-noise masker with varying notch widths (up to 800 Hz).
  • Set stimulus levels 3 dB above individual masked thresholds.

Main Results:

  • IPD thresholds increased with increasing notch width, from ~20° (100 Hz notch) to 100° (800 Hz notch).
  • Model simulations aligned with equalization-cancellation theory predictions.
  • Effective binaural filter widths appear to widen as notch width increases.

Conclusions:

  • Auditory filter width is a critical factor in IPD perception within notched noise maskers.
  • The equalization-cancellation model can account for these findings with adjusted filter parameters.
  • Findings provide insights into binaural processing mechanisms in complex auditory scenes.