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X-ORIGINAL-URL:https://blog.rwth-aachen.de/akustik
X-WR-CALDESC:Veranstaltungen für Akustik-Blog
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20200605T090000
DTEND;TZID=Europe/Berlin:20200605T100000
DTSTAMP:20260506T164914
CREATED:20200522T120559Z
LAST-MODIFIED:20200522T120559Z
UID:1018-1591347600-1591351200@blog.rwth-aachen.de
SUMMARY:Merrill: Using Large-Scale Microphone Arrays for Acoustic Source Localization and Geometric Reconstruction
DESCRIPTION:Large-scale microphone arrays allow for a detailed analysis of room acoustics and the\nidentification of individual sound waves as they move about the room. Although these\ndata help us to track reflections in the room\, the massive amount of data in very large\narrays requires new analysis strategies. This thesis extends current source localization\nand geometric reconstruction techniques to larger-scale microphone arrays. I show\nthat these measurements can be used to identify major boundaries of a hall and\nhave potential for providing a deeper understanding of the geometric origins of room\nacoustic phenomena.
URL:https://blog.rwth-aachen.de/akustik/event/merrill-using-large-scale-microphone-arrays-for-acoustic-source-localization-and-geometric-reconstruction/
LOCATION:Zoom-Meeting
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20200612T110000
DTEND;TZID=Europe/Berlin:20200612T120000
DTSTAMP:20260506T164914
CREATED:20200509T182634Z
LAST-MODIFIED:20200608T140116Z
UID:1016-1591959600-1591963200@blog.rwth-aachen.de
SUMMARY:Kohnen: Physical mismatch between loudspeaker and headphone reproduction
DESCRIPTION:This project is a cross-site investigation with the university of Oldenburg. 14 participants were measured at both sites in terms of HRTFs and HpTFs at two different positions: at the ear drum using probe tube microphones and at the blocked ear canal entrance using mems microphones. The cross site measurements are used to verify whether measurement uncertainties are origin of a calculated mismatch. Addressing the long known effect of the „missing 6 dB“ a loudness balancing test was performed in 4 different rooms using two different headphone types. While the physical mismatch is investigated here the collaboration partner investigated phase effects of the mismatch.
URL:https://blog.rwth-aachen.de/akustik/event/kohnen-wird-noch-bekannt-gegeben/
LOCATION:Zoom-Meeting
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20200619T110000
DTEND;TZID=Europe/Berlin:20200619T120000
DTSTAMP:20260506T164914
CREATED:20200424T101615Z
LAST-MODIFIED:20200604T082442Z
UID:988-1592564400-1592568000@blog.rwth-aachen.de
SUMMARY:Kersten: Directional Sound Field Decay in Reverberation Rooms
DESCRIPTION:According to ISO 345\, the random-incidence sound absorption coefficient is measured in a reverberation room by determining the different reverberation times with and without the absorber inserted. The sound field in the room is assumed to be diffuse. Thus\, the corresponding energy decay curves would be strictly exponential\, but turn out to represent multiple decay processes. In the modal concept of the sound field\, this is assigned to the existence of groups of modes\, which decay according to their specific damping. \nIn this thesis\, the use of a multiple-input multiple-output system allows a directional\, time-dependent analysis while varying the source directivity. Thereby\, differently decaying groups of modes are qualitatively and quantitatively identified. They are in particular discussed in terms of their reverberation times and with respect to the resulting isotropy in the room\, which is a fundamental property of a diffuse sound field. Furthermore\, by optimizing the source directivity with respect to a maximum isotropy\, its ability in weighting the groups of modes is shown.
URL:https://blog.rwth-aachen.de/akustik/event/kersten-direktionales-abklingen-des-schallfeldes-in-hallraeumen/
LOCATION:Zoom-Meeting
CATEGORIES:Verteidigung Masterarbeit
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20200626T110000
DTEND;TZID=Europe/Berlin:20200626T120000
DTSTAMP:20260506T164914
CREATED:20200424T113734Z
LAST-MODIFIED:20200612T110541Z
UID:1001-1593169200-1593172800@blog.rwth-aachen.de
SUMMARY:Klein: Exploring methods to relate room acoustics and in-situ measurements with noise perception of children in schools
DESCRIPTION:Poor acoustic conditions in educational institutions affect children. A noisy environment puts children under constant stress and impairs their performance. Most of the present research and standards concerning classroom acoustics focus on reverberation time and background noise level\, although it is agreed upon that these measures do not provide comprehensive information on the noise perception of children. The noise perception is\, however\, closely related to children’s performance and well-being. Literature states that physical\, psychoacoustic\, and psychological parameters influence the perception of noise. Various models on this objective exist\, yet none takes room acoustics into account and is widely accepted in the context of classroom acoustics.\nHence\, this study aimed to examine the noise perception of children in an educational environment in more detail. An explorative data analysis of room acoustic and in-situ measurement data from 31 rooms of schools and day care centres was carried out. This study presents how various psychoacoustic and room acoustic variables relate to each other. A prediction of children’s noise perception by the parameters was sought. The most influential variables were associated with three underlying factors. A significant model was found to relate sharpness and interaural cross correlation coefficient to the subjective noise perception of children in school.
URL:https://blog.rwth-aachen.de/akustik/event/klein-wird-noch-bekannt-gegeben/
LOCATION:Zoom-Meeting
CATEGORIES:Verteidigung Masterarbeit
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