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Updated: Apr 16, 2026
09:09
Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
Published on: September 27, 2024
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Acoustic source characteristics, across-formant integration, and speech intelligibility under competitive conditions
Brian Roberts1, Robert J Summers1, Peter J Bailey2
1Psychology, School of Life and Health Sciences, Aston University.
Summary
Speech perception relies on grouping formants using acoustic cues. Mismatched formant sources, especially harmonic competitors, significantly impair intelligibility, indicating source type and context are crucial for phonetic processing.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Psychoacoustics
Background:
- Speech perception involves grouping acoustic elements like formants.
- Fundamental frequency (F0) differences aid formant segregation.
- This study investigates radical differences in acoustic source characteristics for speech perception.
Purpose of the Study:
- To explore the role of acoustic source characteristics in speech perception.
- To determine how source type (harmonic vs. tonal) and context affect formant integration.
- To investigate the impact of informational masking on speech intelligibility.
Main Methods:
- Synthetic speech analogues with three formants (F1+F2+F3) were created.
- Experiments used harmonic (H) and tonal (T) analogues for formants (F1+F3 and F2).
- Dichotic presentation and competitor formants (F2C) were used to induce informational masking.
Main Results:
- Source mismatch between F1+F3 and F2 had a modest effect without a competitor.
- Speech intelligibility was lowest when F2 was tonal and F2C was harmonic.
- Harmonic competitors were more effective informational maskers than tonal ones.
Conclusions:
- Source type and context, not just similarity, dictate a formant's phonetic contribution.
- Wideband harmonic analogues act as potent informational maskers in competing acoustic environments.
- These findings advance understanding of across-frequency integration in speech processing.
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