Dear subscribers of the colloquium newsletter,
we are happy to inform you about the next date of our Communication
Technology Colloquium.
*Wednesday, October 12, 2022*
*Speaker*: Christian Prick
*Time:* 10:00 a.m.
*Location*: hybrid - Lecture room 4G and
https://rwth.zoom.us/j/97904157921?pwd=SWpsbDl0MWhrWjY1ZkZaeFRoYmErZz09
Meeting-ID: 979 0415 7921
Passwort: 481650
*Bachelor-Lecture*: Adaptive Active Noise Cancellation for Headphones
using Virtual Sensing
In recent years, active noise canceling headphones became widespread
because they can attenuate low-frequency noise and therefore complement
the passive dampening characteristics of headphones. In order to further
improve their performance, methods to increase the attenuation at higher
frequencies are of interest. As the main limiting factor for high
frequency attenuation is the transfer characteristics from the error
microphone to the eardrum, virtual sensing algorithms have to be used.
These require a knowledge of the acoustic paths to the eardrum, which
are influenced by variations of different kinds.
This thesis investigates the influences of the direction of arrival
(DoA) and fit on the virtual sensing paths and proposes methods for
their approximation. Furthermore, a combined method is proposed, which
takes both the fit and DoA into account to approximate the virtual
sensing paths at runtime. The resulting performance improvements are
evaluated for both in- and over-ear headphones using dummy head
measurements and acoustic simulations. The results indicate that the
influence of the DoA and fit depend on the type of the headphones. The
approximations thus achieve different performance improvements, with the
fit generally having a larger impact. For both types of headphones, the
combined method is able to improve attenuation.
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:
https://www.iks.rwth-aachen.de/aktuelles/kolloquium
--
Irina Esser
Institute of Communication Systems (IKS)
RWTH Aachen University
Muffeter Weg 3a, 52074 Aachen, Germany
+49 241 80 26958 (phone)
ronkartz(a)iks.rwth-aachen.de
http://www.iks.rwth-aachen.de/