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Sources of variation in profile analysis. II. Component spacing, dynamic changes, and roving level
1Department of Speech and Hearing Sciences, Indiana University, Bloomington 47406, USA. warddrennan@yahoo.com
The Journal of the Acoustical Society of America
|January 5, 2002
Summary
Amplitude-increment detection thresholds are lower for static-log profiles than static-harmonic profiles. Roving levels consistently worsened thresholds, but did not change the difference between profile types.
Area of Science:
- Psychoacoustics
- Auditory perception
- Signal processing
Background:
- Traditional profile analysis uses static profiles with logarithmically spaced frequencies.
- Naturally occurring sounds often feature dynamic, harmonically related frequency components.
- Understanding auditory perception of complex sounds is crucial.
Purpose of the Study:
- Compare amplitude-increment detection thresholds between static-log and static-harmonic profiles.
- Investigate the effect of dynamic frequency contours on detection thresholds.
- Assess the impact of roving levels on detection performance.
Main Methods:
- Participants performed amplitude-increment detection tasks.
- Stimuli included static-log, static-harmonic, and dynamic-harmonic profiles.
- Within-trial level variation (roving) was manipulated.
Main Results:
- Static-log profiles yielded thresholds 8.7 dB lower than static-harmonic profiles.
- No consistent effect of dynamic contours was observed.
- Roving levels worsened thresholds by 4-7 dB, with minimal impact on profile differences.
Conclusions:
- Auditory system's processing differs for static-log versus static-harmonic profiles.
- Higher thresholds for static-harmonic profiles may relate to pitch strength.
- Filter-bank models may need revision to account for these findings.
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