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Bachelor-Vortrag: Playback Methods for Multichannel Immersive Binaural Sound
Donnerstag, 22. Oktober 2020
Reproducing spatial audio recordings with headphones allows listeners to perceive sound signals in 3D, where the listeners evaluate the difference between the recorded signals at both ears to localize sound sources. For a more immersive reproduction, sound sources should appear fixed in space in the case of head rotations. So for, several immersive reproduction methods like Motion Tracked Binaural Sound (MTB) and Binaural Cue Adaptation (BCA) were proposed, where BCA works with two microphones while MTB requires a larger number of microphones. The goal of this bachelor's thesis is to extend the BCA algorithm for more than two microphones and to evaluate this new multichannel system in terms of source localization and binaural cue modification.
The thesis shows how additional microphones in the multichannel system can be used to improve the sound source localization, reducing the estimation error also for low Signal-to-Noise Ratio (SNR) values. Furthermore, several experiments show that the additional microphones could solve the front/back confusion and could also discriminate sources that are at the top and bottom, regarding the head model. It is further shown how additional microphones can be employed in the cue modification algorithm. Several experiments confirm that additional microphones could increase the quality, modifying coherent components, and reducing incoherent power error and coherent-to-incoherent power ratio error. As the last extension, an adaptive reference channel selection algorithm is introduced that parameterizes the cue modification based on the optimal reference channel. For larger head movements of the listener, this extension can further improve the quality and even eliminate modification errors for certain head orientations.
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