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Master-Vortrag: Acoustic Head-Tracking in Adaptive Crosstalk Cancellation Systems
Mittwoch, 15. Juli 2020
In order to accurately reproduce an acoustic scene for a listener, a technique known as binaural reproduction is used. A binaural signal consists of two channels containing a different signal for each ear depending on the listener's position relative to the sound source. When trying to replicate a binaural signal over headphones, perfect channel separation is guaranteed, meaning that the binaural signals designated for the left and right ear respectively are only transmitted to the corresponding ear. When a loudspeaker system is used on the other hand, crosstalk between the two binaural signals is an issue and has to be cancelled by the corresponding crosstalk cancellation (CTC) filters. In adaptive crosstalk cancellation (ACTC) systems, these filters are adapted in real-time by placing two microphones close to the ear positions to measure the incoming sound signals and estimate the corresponding impulse responses.
The goal of this thesis is to acoustically estimate the position and orientation of a listener's head based on these impulse responses in order to adapt the binaural signals of the acoustic scene. Based on geometric relations in free space, an estimation of the position and orientation of the listener can be done. Several algorithms for 2D and 3D space have been implemented and compared against each other in terms of accuracy and real-time capability.
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