International guest lectures by Assoc. Prof. Tapio Lokki, Aalto University, Finland and Prof. Peter Svensson, Norwegian University of Science and Technology, Norway


12.10.2017 kl. 14.00 - 12.10.2017 kl. 16.30


The Signal and Information Processing is pleased to announce the following international guest lectures:

“The secret of the Musikverein and other shoebox concert halls”


Tapio Lokki
Associate Professor, Department of Computer Science
Aalto University, Finland


“The modeling of Helmholtz resonators in rooms”


Peter Svensson
Professor, Department of Electronic Systems
Norwegian University of Science and Technology, Norway

Abstract by Tapio Lokki
The Musikvereinssaal in Vienna is indisputably one of the most admired concert halls in the world. Even those who prefer defined and clear sound to overwhelming enveloping reverberation praise the acoustics of the Musikverein. Researchers have studied the acoustics of this golden hall, mostly by the objective measures, but still the superior acoustics remains unexplained. General consensus among acousticians seems to be that numerous strong early lateral reflections, high ceiling, and bright enveloping reverberation are the keys to the success. Here, we aim to explain the acoustics of shoebox concert halls, including the Musikverein, with the measurements of spatial impulse responses. Moreover, we show how acoustics can support music and make it more enjoyable, e.g., by making the dynamic range as large as possible.

Abstract by Peter Svensson
A theoretical foundation for the analysis of the coupling between a room and Helmholtz resonators is presented, based on the classical mode sum for shoe-box shaped rooms which is easy to implement and fast to compute. The formulation of the problem is based on the theory of superposition, representing a Helmholtz resonator with a secondary source. The method also makes it straightforward to introduce several Helmholtz resonators through a recursive approach. The approach presented here makes it possible to optimize the design of Helmholtz resonators in room acoustic designs. Results show how the chosen position for the resonator, as well as its size and internal damping, influences the room-resonator coupling and thus the resulting sound field

All are welcome!


Free of Charge


Signal and Information Processing, Department of Electronic Systems


Aalborg University, Fredrik Bajers Vej 7, B3-104