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A room equalisation approach for a listening area within a 3D loudspeaker setup using a limited number of parametric IIR filters

: Kosmidis, Dimitrios; Stenzel, Hanne; Silzle, Andreas; Sanchez Hernandez, Marcelo Andres

Habets, Emanuël ; Verband Deutscher Tonmeister -VDT-:
International Conference on Spatial Audio, ICSA 2014. Proceedings : Erlangen, Germany; February 21 - 23, 2014
Detmold: Verlag VDT, 2014
ISBN: 978-3-9812830-4-4
Art. 013, 11 pp.
International Conference on Spatial Audio (ICSA) <2, 2014, Erlangen>
Conference Paper
Fraunhofer IIS ()
Schalllabor; Audio

The problem of loudspeaker/room equalisation is a common topic in the world of audio engineering. There are many different ways to approach it, ranging from manual tuning of frequencies to more automated solutions recently. In this paper, a combined equalisation approach that was developed in MATLAB with the purpose of designing a limited number of Infinite Impulse Response (IIR) filters is presented. A Graphical User Interface (GUI) was developed in order to receive room measurements as input, calculate the parameters of the needed filters, and simulate the resulting behaviour of the room. The target of the equalisation was the correction of problematic resonances in the room response of the main sound lab of Fraunhofer IIS according to the ITU-R BS.1116-1 specifications. The developed approach was compared with a commercial room equalisation solution of Finite Impulse Response (FIR) filters, through numerical evaluation and through an ABX listening experiment. The results indicated that the selection of room positions and the averaging of their measurements influence the effectiveness of the resulting equalisation significantly.