Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Taluppfattbarhet med strupmikrofon
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
2018 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Speech intelligibility with throat microphone (English)
Abstract [en]

Contact microphones, especially throat microphones, have been developed to be used in environments with high background noises to improve the speech intelligibility in communication. They pick up vibrations from the surface they are attached to and are therefore less sensitive to sound and noise from the air. Comparison of the speech intelligibility with other types of microphones have previously been done by letting test persons examine the communication devices in question. This study examines the possibility to make use of the STI-method instead and therefore make a comparison faster, more cost-efficient and customizable. The thought is that if the relationship between speech signals and vibrations were known, it could be used to transform the STI test signal to vibrations and then use the STImethod to estimate the speech intelligibility for the chosen contact microphone. This study, containing 22 men and women, evaluated the vibrations at the most suitable locations on the head for contact microphones and compared it with the speech signal of the same test person. Frequency responses were calculated for all locations of the head and a more detailed study showed that the frequency response of the neck may be approximated as a second order lowpass filter with a cut-off frequency of about 300 Hz that attenuates speech signals with higher frequencies. Experiments were also done to measure the STI value of a throat microphone with the known relationship. However, the results pointed out several problems that needs to be addressed before a STI method can be performed successfully. The results from this study may also be used to deeper study the relationships between different vibrations resulting from speech signals and suggestions on how the performance of contact microphones may be improved are given.

Place, publisher, year, edition, pages
2018. , p. 35
Series
UPTEC F, ISSN 1401-5757 ; 18019
Keywords [en]
throat microphone, frequency response, speech intelligibility, contact microphone, transfer function, accelerometer, communication, signal-to-noise ratio
Keywords [sv]
strupmikrofon, frekvenssvar, taluppfattbarhet, kontaktmikrofon, överföringsfunktion, accelerometer, kommunikation, signal-brusförhållande
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:uu:diva-353351OAI: oai:DiVA.org:uu-353351DiVA, id: diva2:1227952
External cooperation
Försvarets materielverk
Educational program
Master Programme in Engineering Physics
Supervisors
Examiners
Available from: 2018-06-27 Created: 2018-06-27 Last updated: 2018-06-27Bibliographically approved

Open Access in DiVA

fulltext(12318 kB)41 downloads
File information
File name FULLTEXT01.pdfFile size 12318 kBChecksum SHA-512
473c6f6bc779c7b36ecf55a27a6bcf2358403578b400ac2707bc0d327029c7e872c13bdcb7ba887b02d556bd411bb125a6df4b5f16e12da1e35b6791b9fb14d7
Type fulltextMimetype application/pdf

By organisation
Signals and Systems Group
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 41 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 7 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf