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Uncomodulated glimpsing in "checkerboard" noise
1Department of Phonetics and Linguistics, University College London, England.
The Journal of the Acoustical Society of America
|May 1, 1993
Summary
Listeners can perceive speech cues during brief noise silences, a phenomenon known as glimpsing. This study explored uncomodulated glimpsing in checkerboard noise, finding it occurs with two and four bands but not more.
Area of Science:
- Auditory perception
- Acoustic signal processing
Background:
- Listeners can "glimpse" acoustic cues during brief interruptions in masking noise.
- Previous research focused on broadband comodulated interruptions.
Purpose of the Study:
- Investigate uncomodulated glimpsing (time and frequency separated cues).
- Examine glimpsing in "checkerboard" noise with varying frequency bands.
Main Methods:
- Adaptive measurement of speech reception thresholds.
- Utilized pink noise (100 Hz to 10 kHz) divided into frequency bands.
- Alternately switched odd/even bands in uncomodulated noise conditions.
Main Results:
- Glimpsing observed in checkerboard noise with 2 and 4 bands, but not 8+ bands.
- In 2-band conditions, release from masking confirmed as uncomodulated glimpsing.
- In 4-band conditions, release from masking explained without uncomodulated glimpsing.
- Glimpsing conditions showed increased intersubject variability.
Conclusions:
- Uncomodulated glimpsing is possible but depends on masker complexity.
- Checkerboard noise reveals frequency-dependent glimpsing mechanisms.
- Findings have implications for analyzing masker fluctuations and auditory models.