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Related Concept Videos

Discrete Fourier Transform01:15

Discrete Fourier Transform

The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Continuous versus discrete frequency changes: different detection mechanisms?

Laurent Demany1, Robert P Carlyon, Catherine Semal

  • 1Laboratoire Mouvement, Adaptation, Cognition UMR CNRS 5227, Universite de Bordeaux, Bordeaux, France. laurent.demany@u-bordeaux2.fr

The Journal of the Acoustical Society of America
|February 12, 2009
PubMed
Summary
This summary is machine-generated.

The auditory system can detect frequency glides, but this effect disappears if the glide isn't smooth. The direction of frequency glides is perceivable once they are detectable, suggesting continuous and discrete frequency changes are processed similarly.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing in hearing

Background:

  • Previous research suggested a specific auditory mechanism for detecting frequency glides.
  • This mechanism was thought to be distinct from discrete frequency change detection.
  • It was also proposed that glide direction is difficult to discern near the detection threshold.

Purpose of the Study:

  • To investigate the conditions under which the auditory "glide effect" occurs.
  • To determine if the direction of a frequency glide is perceivable.
  • To re-evaluate the interpretation of the glide effect and auditory frequency change detection.

Main Methods:

  • Experiment 1: Tested the glide effect with smoothly connected and non-smoothly connected glides.
  • Experiment 2: Assessed the perceptual identification of glide direction at various detectability levels.
  • Utilized pure tones, frequency glides, and silent intervals as auditory stimuli.

Main Results:

  • The glide effect was confirmed but only when glides were smoothly connected to tones.
  • The glide effect vanished when glides were not smoothly connected.
  • Glide direction was identifiable as soon as the glide was detectable, contradicting previous assumptions.

Conclusions:

  • The auditory glide effect is dependent on smooth transitions.
  • Continuous frequency changes can be detected similarly to discrete frequency changes.
  • A unified mechanism may underlie the detection of both continuous and discrete frequency changes.