MATERIALS: Impact of face masks on voice radiation

Speaker directivities of a HEAD acoustics HMS II.3 head and mouth simulator wearing different mouth and nose covers in the SOFA format, as "GeneralFIR" convention, as described in [1].

[1] Poerschmann C., Luebeck T., & J.M. Arend (2020). "Impact of face masks on voice radiation". The Journal of the Acoustical Society of America 148(6) pp.3663-3670 (2020)

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Name convention:

Directivity_no_mask_ref: Reference measurement: HMS without a mask

Directivity_mask1-6: all measured masks, according to the numeration below. All masks were measured two times indicated with "measurement2".

Medical masks:
1) Disposable Triple Layer Filter Dustproof Earloop Non Woven medical mask, (brandname: Arvin, Protection Class DS3)

Filtering facepiece respirators:
2) Three-dimensional respirator, Protection Class KN 95 (manufacturer: Suzhou Jinruida Protective Equipment Co, Inc.)
3) MB 21 - fine dust respirator, Protection Class FFP 2 (manufacturer: MB Filter Products AB, Sävedalen, Sweden)

Cloth face coverings:
4) Microfibre scarf (manufacturer: Rose, material: 100\% polyester)
5) Cloth Face Covering (manufacturer: Modeatelier Scharn, Engelskirchen, Germany)
6) Hand-made cloth face covering: Double Layers cotton (manufacturer Stoffliebe, Gelsenkirchen, Germany)

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Contact:
Christoph Pörschmann, Tim Lübeck, and Johannes M. Arend
TH Köln - University of Applied Sciences
Institute of Communications Engineering
Department of Acoustics and Audio Signal Processing
Betzdorfer Str. 2, D-50679 Cologne, Germany

https://www.th-koeln.de/personen/christoph.poerschmann/
https://www.th-koeln.de/personen/tim.luebeck/
https://www.th-koeln.de/personen/johannes.arend/