Optimal data capturing for indoor location sensing

In today’s world, accurate location sensing is impossible to think away. One of the most prominent and most used techniques for determining location is GPS. In the outside world, GPS is capable of pinpointing a location with only a few meters error. But inside buildings, GPS often fails to deliver the same accuracy. In this paper, a relatively...

Methods for reducing error in approximations of the Rayleigh integral

The goal of seismic imaging is to create a model of the subsurface from samples of a transmitted wavefield that is reflected in soil layers.<br/>The created model can be used to locate storage possibilities for CO2 or H2 or to find oil and gas reservoirs or other natural resources.<br/>Seismic imaging relies on the propagation of wavefields,...

Sound transmission in cross-laminated timber buildings: A numerical approximation of the sound transmission through CLT elements and junctions

Low-frequency sound transmission in a cross-laminated timber apartment building can result in annoyance, even if the acoustic requirements of the building code are fulfilled. Cross-laminated timber is an upcoming material in the building industry. But there are also problems arising when building with this relatively new material. CLT is a...

Inferring the location of reflecting surfaces from acoustic measurements: Using a compact microphone array collocated with a loudspeaker

The response of a sound system in a room primarily varies with the room itself, the position of the loudspeakers and the listening position. The room boundaries cause reflections of the sound that can lead to undesired effects such as echoes, resonances or reverberation. Knowledge of the location of these large reflecting surfaces can help to...

Pattern Kerfing for Responsive Wooden Surfaces: A formal approach to produce flexible panels with acoustic performance

The aim of this thesis is to present the outputs of a project in which pattern kerfing techniques are explored for producing responsive freeform panels out of wooden plates. Relevant research such as the ones presented by Ivanišević (2014), Zarrinmehr et al. (2017) and Ohshima et al. (2013) have shown that it is possible to bend a wooden plate...

Snoring Sound Production and Modelling: Acoustic Tube Modelling

The thesis project is aimed at designing an unobtrusive method to find the obstruction location and severity for patients who are not diagnosed with Obstructive sleep apnea, during their non-sedated sleep using simple recording devices within uncontrolled environment. Similar to speech generation, which is enabled by opening and closing of the...

Sound localization using an array of Acoustic Vector Sensors: Mainstation data processing

In this thesis five different Direction Of Arrival algorithms will be developed for use with Microflown's Acoustic Vector Sensors, which will determine the direction an acoustic signal originates from. These algorithms will run on a main-station that will remotely receive data from an array of AVSs. The performance of these algorithms is...

Localization and Classification using an Acoustic Sensor Network - experimental data processing for urban acoustic surveillance

The Acoustic Sensor Network (ASN) has emerged as an important research area, because acoustic sensors can significantly increase situational awareness in many situations. Although little is currently known about acoustic surveillance, Thales Nederland is interested in the potential offered by an ASN in urban environments and specifically for...