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Comodulation masking release in an off-frequency masking paradigm.

Ramona Grzeschik1, Björn Lübken1, Jesko L Verhey1

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Comodulation masking release (CMR) was investigated in off-frequency masking. A significant CMR effect was observed with notched noise, but not with narrowband noise, suggesting complex underlying mechanisms.

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Area of Science:

  • Psychoacoustics
  • Auditory perception
  • Signal processing in hearing

Background:

  • Comodulation masking release (CMR) occurs when masker envelopes are correlated.
  • CMR typically involves masker components at both on- and off-frequencies relative to the signal.
  • This study explores CMR in off-frequency masking paradigms.

Purpose of the Study:

  • To determine if CMR exists without a masker component at the signal frequency.
  • To investigate the influence of masker spectral composition on CMR.
  • To test the predictive power of a modulation-filterbank model for CMR.

Main Methods:

  • Measuring detection thresholds for a 500-Hz signal.
  • Using broadband maskers with spectral notches at the signal frequency.
  • Comparing modulated versus unmodulated maskers and different masker bandwidths.

Main Results:

  • Significant CMR was found for notched noise maskers up to 400 Hz notch width.
  • A large CMR in the no-notch condition was attributed to masker generation.
  • No CMR was observed with narrowband noise maskers, but 3-4 dB CMR with remote bands.

Conclusions:

  • CMR can occur in off-frequency masking, particularly with notched noise.
  • The generation method of modulated maskers significantly impacts CMR magnitude.
  • Existing models may not fully capture all mechanisms underlying CMR, especially with narrowband noise.