@InProceedings{Bulling2018_383,
author = {Philipp Bulling and Klaus Linhard and Arthur Wolf and Gerhard Schmidt},
booktitle = {Studientexte zur Sprachkommunikation: Elektronische Sprachsignalverarbeitung 2018},
title = {Automatic Equalization for In-Car Communication Systems},
year = {2018},
editor = {André Berton and Udo Haiber and Wolfgang Minker},
month = mar,
pages = {7--14},
publisher = {TUDpress, Dresden},
abstract = {An automatic equalization filter for in-car communication (ICC) systems is presented. ICC systems usually use an adaptive filter to stabilize the feedback loop between the loudspeakers and the speaker microphone. In this work, a second adaptive filter is introduced that aims at equalizing the sound, radiated from one or more loudspeakers, at the listener’s position in order to achieve a linear frequency response. Therefore, a microphone is placed close to the listener’s ears in the car ceiling. To obtain a flat frequency response at the listener’s position, the loudspeaker signal must be equalized with the inverse frequency response of the path between the loudspeakers and the microphone. This path is described by the impulse response and it is estimated by means of an adaptive filter in this work. To design the equalization filter, the frequency response of the adaptive filter is used. Target applications are speech applications operating in a closed electro-acoustic loop, such as ICC systems. However, the idea can also be applied to other audio presentations. Both simulations and tests in a real car show that the proposed automatic equalization filter improves speech quality in terms of a natural sounding system.},
isbn = {978-3-959081-28-3},
issn = {0940-6832},
keywords = {Signal Processing},
url = {https://www.essv.de/pdf/pdf/2018_7_14.pdf},
}