Changes on Speech Transmission Characteristics by Types of Mask
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초록
Purpose: Given the increased levels of fine and ultrafine dust, as well as the spread of COVID-19, current opinion is that most people will wear a face mask such a KF94 mask for a long time. To test speech transmission through the face masks, various types of masks including dust masks available in the market at the time of the study were tested under laboratory conditions. Methods: Fourteen types of masks worn on a head and torso simulator (HATS) and test signals were played on a speaker installed in the mouse position of the HATS. Speech Transmission Index (STI) and the speech level in the octave band were measured at distances of 1 m and 2 m. Results: STI at a distance of 2 m was decreased to 3.4-5.7% and speech levels in the octave band at 4 kHz or higher were also decreased when wearing disposable masks and a cotton mask. KF80 and KF94 masks showed decreased STI similar to those of disposable masks; however, a decrease in the speech level was observed at the octave bands of above 2 kHz. Dust masks and single-cartridge half-face respirators showed approximately 11.2% and 33.7% to 39.3% decreases in STI levels, respectively. Conclusion: When wearing masks, STI and the speech level was decreased in the high-frequency bands. However, speech level differences at high frequencies may be related to the increased voice level of the speaker and the understanding of consonants with the masks for several hours in living and working environments.
Abstract
Purpose: Given the increased levels of fine and ultrafine dust, as well as the spread of COVID-19, current opinion is that most people will wear a face mask such a KF94 mask for a long time. To test speech transmission through the face masks, various types of masks including dust masks available in the market at the time of the study were tested under laboratory conditions. Methods: Fourteen types of masks worn on a head and torso simulator (HATS) and test signals were played on a speaker installed in the mouse position of the HATS. Speech Transmission Index (STI) and the speech level in the octave band were measured at distances of 1 m and 2 m. Results: STI at a distance of 2 m was decreased to 3.4-5.7% and speech levels in the octave band at 4 kHz or higher were also decreased when wearing disposable masks and a cotton mask. KF80 and KF94 masks showed decreased STI similar to those of disposable masks; however, a decrease in the speech level was observed at the octave bands of above 2 kHz. Dust masks and single-cartridge half-face respirators showed approximately 11.2% and 33.7% to 39.3% decreases in STI levels, respectively. Conclusion: When wearing masks, STI and the speech level was decreased in the high-frequency bands. However, speech level differences at high frequencies may be related to the increased voice level of the speaker and the understanding of consonants with the masks for several hours in living and working environments.
참고문헌 (15)
- Atcherson, S. R., "The effect of conventional and transparent surgical masks on speech understanding in individuals with and without hearing loss", Journal of the American Academy of Audiology, 28(1), pp.58~67 (2017)
- "A Boom in the Air Purifier and Yellow Sand Mask Industry against Fine Dust" (2015)[URL]
- "“In a Place Like a Chicken Coop Where You Can’t Use a Mask.” Call Center Group Infection. Why?" (2020)[URL]
- 한영권, "A Study on the Korean Conversation Speech Level and Spectrum in Sound-Treated Environment", Audiology and Speech Research, 16(2), pp.133~139 (2020), 한국청각언어재활학회
- International Electrotechnical Commission, "Sound System Equipment–Part 16: Objective Rating of Speech Intelligibility by Speech Transmission Index (IEC 60286-16)", International Electrotechnical Commission, ~ (2011)
- International Organization for Standardization, "Ergonomics—Assessment of Speech Communication(ISO 9921)", International Standard Organization, ~ (2003)
- International Organization for Standardization, "Acoustics—Measurement of Room Acoustic Parameters—Part 3 : Open Plan Offices(ISO 3382-3)", International Standard Organization, ~ (2012)
- "“6.59 Million Units to 12.91 Million Units” Mask Daily Production Doubled" (2020)[URL]
- "A ‘Smiling and Crying’ Distributor Because of Fine Dust" (2018)[URL]
- Korea Research Institute of Standards and Science, "Study on Gas Mask for its New Specification and Supply", National Emergency Management Agency, ~ (2009)
- "“It Seems to Work 8 Hours in an Elevator”98% of Call Center Counselors Say “Work Environment Risk.”" (2020)[URL]
- Mendel, L. L., "Speech understanding using surgical masks: A problem in health care?", Journal of the American Academy of Audiology, 19(9), pp.686~695 (2008)
- "Guidelines for Reference Standards for Health Mask" (2019)[URL]
- Palmiero, A. J., "Speech intelligibility assessment of protective facemasks and air-purifying respirators", Journal of Occupational and Environmental Hygiene, 13(12), pp.960~968 (2016)
- Radonovich, L. J., "Diminished speech intelligibility associated with certain types of respirators worn by healthcare workers", Journal of Occupational and Environmental Hygiene, 7(1), pp.63~70 (2010)