Dear subscribers of the colloquium newsletter,
we are happy to inform you about the next date of our Communication
*Wednesday, November 24, 2021*
*Speaker*: Georg Krekel
*Time*: 2:00 p.m.
Meeting-ID: 979 0415 7921
*Bachelor Lecture*: Comparison of Sound Field Translation Methods
Higher Order Ambisonics (HOA) signals can be used to allow directional
playback of sound signals, where the listener can rotate their head
around all three rotational axis. HOA signals can also be adapted to
allow translational movement of the listener using sound field
translation. Sound field translation is the process of evaluating a
sound field at a different position than it was recorded at. At the IKS
(Institute of Communication Systems, RWTH Aachen) multiple algorithms
have been proposed, that try to achieve psychoacoustically plausible
sound field translation, however the inner workings of these algorithms
are not well understood.
This thesis compares different aspects of two algorithms, Adaptive
Beamforming and Adaptive Spacewarping, mainly by deriving analytical
expressions that allow deeper understanding of the underlying effects.
The algorithms were split into two main stages, the translation stage
and the filtering stage. There are significant differences between ASW
and ABF. In the translation stage ASW is distorted compared to ABF.
However, differences shrink with the order of the HOA input signal. The
filtering stage for ABF and ASW is very similar, especially if oracle
information of covariance matrices is not available.
All interested parties are cordially invited, registration is not required.
General information on the colloquium, as well as a current list of
dates of the Communication Technology Colloquium can be found at:
Institute of Communication Systems (IKS)
RWTH Aachen University
Muffeter Weg 3a, 52074 Aachen, Germany
+49 241 80 26958 (phone)