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/Aktue…>
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
--
Dipl.-Ing. Ingo Witew
Research Assistant
ITA - Institute of Technical Acoustics
RWTH Aachen University
Kopernikusstr. 5
52074 Aachen, Germany
Tel +49 241 80-97994
Mobile +49 175 52 37 536
Fax +49 241 80-92214
Ingo.Witew(a)akustik.rwth-aachen.de
http://www.akustik.rwth-aachen.de
