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Measuring the distortion of speech by a facemask
Martin Rothenberg1, Sandra Rothenberg2
1Syracuse University, 5211 Hook Circle, Jamesville, New York 13078, USA.
JASA Express Letters
|October 1, 2022
Summary
Facemasks distort speech by altering voice formants. Increasing the distance between the mask and mouth can reduce this speech distortion, a key finding for understanding mask acoustics.
Area of Science:
- Acoustics
- Speech Science
- Biomedical Engineering
Background:
- Previous studies primarily examined reduced speech amplitude due to facemasks.
- This research investigates facemask-induced speech distortion beyond amplitude reduction.
Purpose of the Study:
- To explore how facemask acoustics interact with vocal tract acoustics.
- To determine the impact of facemasks on voice formants and speech distortion.
Main Methods:
- Measured the increase in damping of the first formant for various facemasks.
- Analyzed the acoustic properties of different facemask types and their effect on speech.
Main Results:
- Facemasks were found to dampen the first formant of the voice.
- Speech distortion was reduced when the distance between the mask and mouth increased.
Conclusions:
- The interaction between facemask and vocal tract acoustics significantly contributes to speech distortion.
- Adjusting mask-to-mouth distance is a potential strategy to mitigate facemask-induced speech alterations.
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