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Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

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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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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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Perception of Sound Waves01:01

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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.
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Interference and Superposition of Waves01:07

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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.
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Beats01:09

Beats

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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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Properties of Fourier series II01:21

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Time scaling of signals is a crucial concept in signal processing that affects the Fourier series representation without altering its coefficients. The process modifies the fundamental frequency, thereby changing how the series represents the signal over time. This principle is essential in various applications, including audio and image processing, where signal manipulation is frequent. Understanding function symmetries is fundamental to simplifying the Fourier series.
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Related Experiment Video

Updated: May 2, 2026

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
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Symmetric interactions and interference between pitch and timbre.

Emily J Allen1, Andrew J Oxenham1

  • 1Department of Psychology, University of Minnesota, Minneapolis, Minnesota 55455.

The Journal of the Acoustical Society of America
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PubMed
Summary

Pitch and timbre perception interact symmetrically, meaning changes in one affect the other equally. Musical training does not significantly improve the ability to distinguish between pitch and timbre variations.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Music cognition

Background:

  • Spectral shape variations in harmonic tone complexes alter timbre and can impair fundamental frequency (F0) or pitch discrimination.
  • The reciprocal effect of F0 variations on spectral shape discrimination is less understood.

Purpose of the Study:

  • To investigate the symmetry of pitch-timbre interactions.
  • To assess if musical training enhances the ability to disregard irrelevant perceptual dimensions.

Main Methods:

  • Measured difference limens (DLs) for F0 with and without spectral centroid variations, and vice versa.
  • Quantified sensitivity by varying target and interfering parameters concurrently relative to individual DLs.

Main Results:

  • Demonstrated significant and comparable interference between pitch (F0) and timbre (spectral centroid) dimensions.
  • Observed that upward spectral motion was often misinterpreted as upward F0 motion, and vice versa.
  • Found musicians had superior F0 DLs but similar spectral centroid DLs compared to non-musicians.
  • Reported similar interference effects (decreased sensitivity) in both groups and dimensions.

Conclusions:

  • Pitch and timbre interference effects are symmetrical when controlling for individual sensitivities.
  • Musical training does not appear to reliably mitigate these pitch-timbre perceptual interactions.