Sehr geehrte Abonnenten des Kolloquium-Newsletters,

am    Freitag, 13.07.2018 ist einer der nächsten Termine für das Akustische Kolloquium am Institut für Technische Akustik der RWTH Aachen.

*Termin* *Vortragender* *Titel* 13.07.2018, 11:00 Pascal Palenda /BSc-Student////// / Continuous measurement of room impulse responses with Spherical Loudspeaker Arrays http://www.akustik.rwth-aachen.de/cms/Technische-Akustik/Das-Institut/Aktuelle-Veranstaltungen/Aktuelle-Kolloquien/Akustisches-Koloquium/%7Epzjg/Continuous-measurement-of-room-impulse-r/

Der Vortrag wird im Seminarraum des Instituts (Kopernikusstraße 5) gehalten.

Zusammenfassung:

In the field of acoustics the result of a room impulse response (RIR) measurement is used for auralization, room reflection analysis and sound field analysis. When measuring a single RIR, the source and the receiver, have a directivity which influences the measurement. If a set of RIRs for different spatial directions is measured, we obtain a directional room impulse response (DRIR). If only one loudspeaker is used, a sequential measurement method can be employed, resulting in a virtual loudspeaker array. However, a sequential measurement results in a long measurement duration, as the loudspeaker has to be moved to the different orientations. One has to consider the time for starting and stopping. If a real loudspeaker array is used, the measurement duration can be reduced. However, to achieve the high spatial resolution, the loudspeaker array still has to be rotated. The goal is to minimize the time to complete a DRIR measurement. A proposed way is doing continuous measurements. For this method the source is rotated continuously. RIRs for different spatial directions, corresponding to the sequential measuring direction, can then be extracted from the captured signal. The continuous rotation eliminates the time for starting and stopping at the desired orientations. Further decreasing the measurement duration. However, the continuous rotation introduces further variables which have to be considered. This thesis examines the viability and limitations of continuous measurements for DRIR measurements. To evaluate the influence of the continuous rotation, different rotation speeds are used. Additionally, the measured room was varied in its reverberation time. Different excitation signals are used to measure a room using a measurement set-up with an spherical loudspeaker array. The RIRs are then recovered using different algorithms. The results of the continuous measurements are compared to the sequential measurements. The different algorithms, excitation signals and rotation speeds are compared against each other to find the preferred choice.

Für Fragen oder Kommentare stehe ich Ihnen gerne zur Verfügung.

Mit freundlichen Grüßen,

Ingo Witew