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. 2019 Jun 25;13:140. doi: 10.3389/fnbeh.2019.00140

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Copyright © 2019 Gerum, Rahlfs, Streb, Krauss, Grimm, Metzner, Tziridis, Günther, Schulze, Kellermann and Schilling.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Equalizer scheme. (A) The block diagram of the system identification task; the output signal X_n of the soundcard is fed into the Loudspeaker-Enclosure-Microphone-System (LEMS) and recorded by the microphone. The measurement noise is modeled here separately as being added in the discrete time domain. The same signal X_n is fed into the adaptive filter H and the difference signal e_n is used to adjust the filter coefficients. This iterative process leads to a filter that mimics the transfer function of the “unknown system”. (B) The frequency response of the overall system without equalization (blue) and with equalization (red). The frequency response is flattened in the range from 2 to 20 kHz.