Characterization of the Forearm's bio-acoustical properties - a study on acoustic source localization on the human forearm as a potential human-machine interface
| dc.contributor.author | Brundin, Niklas | |
| dc.contributor.department | Chalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE) | sv |
| dc.contributor.examiner | Ahrens, Jens | |
| dc.contributor.supervisor | Ahrens, Jens | |
| dc.date.accessioned | 2021-09-13T09:04:33Z | |
| dc.date.available | 2021-09-13T09:04:33Z | |
| dc.date.issued | 2021 | sv |
| dc.date.submitted | 2020 | |
| dc.description.abstract | Bio-acoustics have started to increase in popularity outside of the medical field, where it has been used as a tool to determine bone health and provide hearing aids through bone conduction. Over the last couple of years several projects have been conducted utilizing bio-acoustical signals as an alternative to conventional human-machine interfaces such as touchscreens and voice recognition. This thesis investigates the possibilities of utilizing the bio-acoustical characteristics of an individual’s forearm as a human-machine interface through acoustic localization of self inflicted impacts. It also aims to analyze the bio-acoustical properties of the forearm, how these properties are affected by muscle tension, and to verify if these are universal properties which can be observed for multiple test subjects. The results show that there are universal characteristics between several test subjects and that there is a frequency region between 70 Hz and 350 Hz with low attenuation, which is well suited for bio-acoustical measurements. This frequency region can be altered by having the test subjects place their wrist in extension or flexion, which causes the frequency region to shift by roughly 30%. It was also shown that the different impact positions have unique time signatures and frequency spectras compared to each other. The amplitude difference between the two sensors was also unique for the impact locations and showcased a symmetrical pattern between the medial or lateral side. The location specific amplitude differences only held true as long as impact located at the middle of the forearm were excluded. The time difference between the two sensors did not show the same symmetrical pattern as the amplitude difference, and can therefore not be used on its own to determine the direction of arrival. | sv |
| dc.identifier.coursecode | ACEX30 | sv |
| dc.identifier.uri | https://hdl.handle.net/20.500.12380/304108 | |
| dc.language.iso | eng | sv |
| dc.setspec.uppsok | Technology | |
| dc.subject | bio-acoustic, bio-vibration, bone conduction | sv |
| dc.title | Characterization of the Forearm's bio-acoustical properties - a study on acoustic source localization on the human forearm as a potential human-machine interface | sv |
| dc.type.degree | Examensarbete för masterexamen | sv |
| dc.type.uppsok | H | |
| local.programme | Sound and vibration (MPSOV), MSc |