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Combination of binaural and harmonic masking release effects in the detection of a single component in complex tones. | LitMetric

Combination of binaural and harmonic masking release effects in the detection of a single component in complex tones.

Hear Res

Medizinische Physik and Cluster of Excellence Hearing4all, Universität Oldenburg, 26111, Oldenburg, Germany. Electronic address:

Published: March 2018

AI Article Synopsis

  • The study examines how harmonic and binaural cues affect the detection of an 800-Hz tone when it's masked by a harmonic complex tone presented identically to both ears (diotic) or with a phase difference (IPD).
  • Results indicate that while the phase difference generally aided in detecting the target tone among various maskers, mistuning only helped in specific diotic conditions with certain types of maskers.
  • An auditory model was used to predict outcomes and highlighted that processing modulation cues is complex and varies depending on the type of masker, suggesting that binaural processing has limitations in utilizing modulation information effectively.

Article Abstract

Both harmonic and binaural signal properties are relevant for auditory processing. To investigate how these cues combine in the auditory system, detection thresholds for an 800-Hz tone masked by a diotic (i.e., identical between the ears) harmonic complex tone were measured in six normal-hearing subjects. The target tone was presented either diotically or with an interaural phase difference (IPD) of 180° and in either harmonic or "mistuned" relationship to the diotic masker. Three different maskers were used, a resolved and an unresolved complex tone (fundamental frequency: 160 and 40 Hz) with four components below and above the target frequency and a broadband unresolved complex tone with 12 additional components. The target IPD provided release from masking in most masker conditions, whereas mistuning led to a significant release from masking only in the diotic conditions with the resolved and the narrowband unresolved maskers. A significant effect of mistuning was neither found in the diotic condition with the wideband unresolved masker nor in any of the dichotic conditions. An auditory model with a single analysis frequency band and different binaural processing schemes was employed to predict the data of the unresolved masker conditions. Sensitivity to modulation cues was achieved by including an auditory-motivated modulation filter in the processing pathway. The predictions of the diotic data were in line with the experimental results and literature data in the narrowband condition, but not in the broadband condition, suggesting that across-frequency processing is involved in processing modulation information. The experimental and model results in the dichotic conditions show that the binaural processor cannot exploit modulation information in binaurally unmasked conditions.

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Source
http://dx.doi.org/10.1016/j.heares.2017.12.007DOI Listing

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