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Comodulation masking release in consonant recognition.
1Department of Auditory Implants and Perception, House Ear Institute, Los Angeles, California 90057-1922, USA. bkwon@cochlear.com
The Journal of the Acoustical Society of America
|August 21, 2002
Summary
Comodulation masking release (CMR) improves consonant identification when masker envelopes are coherent. This finding supports a cued-listening theory for auditory perception, demonstrating how temporal envelope coherence aids speech processing.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Psychoacoustics
Background:
- Comodulation masking release (CMR) describes improved signal detection with coherent amplitude fluctuations in noise.
- Understanding CMR's effect on speech perception is crucial for auditory models.
Purpose of the Study:
- To investigate if comodulation masking release (CMR) enhances consonant identification.
- To compare consonant identification under on-frequency, comodulated, and non-comodulated masking conditions.
Main Methods:
- Consonant identification was tested using bandpass speech stimuli.
- Three masker conditions were used: on-frequency, comodulated flanking bands, and non-comodulated flanking bands.
- Experiments involved multiple consonant tokens, flanking band locations, and masker levels.
Main Results:
- Comodulation consistently yielded higher consonant identification scores than noncomodulation (average 3.5% difference).
- No significant difference was found between on-frequency only and comodulation conditions.
- The addition of a comodulated flanking band did not produce an unmasking effect.
Conclusions:
- CMR positively impacts consonant recognition, supporting the cued-listening theory over envelope correlation theory.
- Auditory system utilizes temporal envelope coherence for enhanced speech perception in complex noise environments.