This paper extends an acoustic feedback cancellation system by incorporating multiple decorrelation methods. The baseline system is based on a frequency-domain Kalman filter implemented in a multi-delay structure. The proposed extensions include a variable time delay line, prediction, distortion compensation, and a simplified reverberation model. Each extension is analyzed, and a practical parameter range is defined. While existing literature often focuses on a single extension, such as prediction, to describe an optimal system, this work demonstrates that each individual extension contributes to performance improvements. Furthermore, the combination of all proposed extensions results in a superior system. The evaluation is conducted using publicly available datasets, with performance assessed through system distance metrics and the objective speech quality measure PSEQ.
@article{arxiv.2602.06921,
title = {The Combination of Several Decorrelation Methods to Improve Acoustic Feedback Cancellation},
author = {Klaus Linhard and Philipp Bulling},
journal= {arXiv preprint arXiv:2602.06921},
year = {2026}
}