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Identifier

000406882

Title

Επεξεργασία ήχου για εφαρμογές εικονικών περιβαλλόντων

Alternative Title

Audio signal processing for immersive audio applications

Author

Περονικολής, Μιχαήλ Ν.

Thesis advisor

Μουχτάρης, Αθανάσιος

Reviewer

Τσακαλίδης, Παναγιώτης
Δημητρόπουλος, Ξενοφώντας

Abstract

In virtual reality applications, rendering virtual sound sources in three dimensions is an important element for optimal user experience. Most of the three-dimensional sound systems with two loudspeakers often have a limited and fixed optimal listening experience point (sweet spot) for the user (in order for him/her to be able to fully understand the three-dimensional effect), thereby suffering from poor performance in reverberant environments. In this thesis, we focus on three-dimensional audio reproduction with two loudspeakers, taking into account the user's location. Specifically, we developed a three-dimensional sound system with two loudspeakers which is designed to accommodate for adapting the sweet spot in real-time according to the position of the listener. This system consists of a camera that communicates with a three-dimensional head tracker, capable of providing information on the position and orientation of the head of the listener. Given this information, the system makes the necessary geometric calculations to determine the optimal filters for 3D sound reproduction. The system has the ability to place the virtual source in appropriate azimuth and elevation angles around the head of the listener. Additionally, the system includes modeling of the room where the user is located, from which we obtain information relevant to the assessment of the main reflections, which are then integrated in the calculation of the optimal filter calculations. To evaluate the system performance, we performed listening tests and simulations. The results confirm that the three-dimensional sound system significantly improves the perception and the user's ability to identify the virtual source position.

Language

Greek

Subject

3D audio

Sweet spot

Virtual reality

Virtual sound source

Βέλτιστο σημείο ακουστικής εμπειρίας

Εικονική πηγή

Εικονική πραγματικότητα

Εικονικό περιβάλλον

Τρισδιάστατος ήχος