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Level-dependent critical bandwidth for phase discrimination

D A Nelson1

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

The Journal of the Acoustical Society of America
|March 1, 1994
PubMed
Summary
This summary is machine-generated.

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Normal-hearing listeners can distinguish phase-modulated sounds at low frequencies. This ability, critical for phase discrimination (CBphs), decreases as frequency differences increase, with CBphs rising with sound level up to 80 dB SPL.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Monaural phase discrimination is crucial for understanding auditory processing.
  • Sinusoidally amplitude-modulated (SAM) and quasi-frequency-modulated (QFM) waveforms share power spectra but differ in temporal fine structure.

Purpose of the Study:

  • To evaluate monaural phase discrimination in normal-hearing listeners.
  • To determine the critical bandwidth for phase discrimination (CBphs) as a function of sound level and modulation frequency.

Main Methods:

  • Six normal-hearing listeners discriminated between SAM and QFM three-tone complexes at 1000 Hz.
  • Stimuli varied in component frequency difference and sound pressure level (SPL).
  • Psychometric functions were used to define CBphs.

Related Experiment Videos

Main Results:

  • Listeners could discriminate QFM from SAM at low modulation frequencies.
  • CBphs increased with SPL from 40 to 80 dB (CBphs = 34.I(0.136)), then plateaued.
  • Results align with level-dependent auditory filter slopes and cubic difference tone interactions.

Conclusions:

  • Auditory filter characteristics and internally generated cubic difference tones likely underlie phase discrimination.
  • The critical bandwidth for phase discrimination is level-dependent and approaches an asymptote.
  • Individual differences at low levels may stem from internal phase ambiguities.