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Cues for discrimination of envelopes
E A Strickland1, N F Viemeister
1Department of Psychology, University of Minnesota, Minneapolis 55455, USA.
The Journal of the Acoustical Society of America
|June 1, 1996
Summary
Listeners can detect amplitude modulation in noise, with detection thresholds influenced by masker frequency and phase. The ratio of maximum to minimum amplitude effectively predicts detection performance without needing specific modulation frequency tuning.
Area of Science:
- Auditory perception
- Signal processing in hearing
Background:
- Understanding auditory perception of amplitude modulation is crucial for explaining how humans process complex sounds.
- Previous research has explored modulation frequency tuning, but the role of envelope statistics remains less clear.
Purpose of the Study:
- To investigate the detection thresholds of sinusoidal amplitude modulation in the presence of a masker modulation frequency.
- To determine which envelope statistics listeners utilize for decision-making in modulation detection tasks.
Main Methods:
- Measured detection thresholds for sinusoidal amplitude modulation with broadband noise carriers.
- Introduced a masker modulation frequency at different relationships to the signal frequency.
- Simulated listener decisions using an envelope detector model with various statistical measures.
Main Results:
- Broad tuning for modulation frequency was observed.
- Detection thresholds were dependent on the relative phases of signal and masker when masker frequency was half or twice the signal frequency.
- The maximum to minimum amplitude ratio (max/min) statistic successfully predicted major trends in the data.
Conclusions:
- Listeners exhibit broad tuning for modulation frequency detection.
- Envelope statistics, particularly the max/min ratio, play a significant role in auditory modulation detection.
- The max/min statistic can predict performance without assuming specific modulation frequency-tuned channels.