Study and optimization of digital filters transition

• Κύριος συγγραφέας: Παναγιωτοπούλου, Σταυρούλα
• Άλλοι συγγραφείς: Panagiotopoulou, Stavroula
• Γλώσσα: English
• Έκδοση: 2022
• Θέματα: Digital signal processor (DSP); Audio signal processing; Transients; Filter switching; Επεξεργασία ηχητικών σημάτων; Μεταβατικά φαινόμενα

The center of this thesis is digital filter transition; a problem encountered in audio applications, such as speech coding, equalization of audio signal and music synthesis. Those are some cases, where filter switching can cause undesirable sound effects (clicks, plops, gaps etc). In the first part of the present thesis, an extensive survey of existing transition techniques is presented, covering a large part of current literature. After a selection of widely-known methods from the aforementioned review, we implemented and tested the respective algorithms in MATLAB environment. To assess the implementation results, objective evaluation is performed through certain commonly accepted models and metrics. Based on this evaluation, the optimal transition algorithm is identified and implemented in real time, on a digital signal processor (DSP).