Comparative Evaluation of Howling Detection Criteria in Notch-Filter-Based Howling Suppression

摘要

Notch-filter-based howling suppression (NHS) is a popular approach to acoustic feedback control in public address and hands-free communication systems. The NHS method consists of two stages: howling detection and notch filter design. While the design of notch filters is well established, there is little agreement in the NHS literature on how the detection problem should be tackled. Moreover since the NHS literature consists mainly of patents, only few experimental results have been reported. A unifying framework for howling detection is provided and a comparative evaluation of existing and novel howling detection criteria is performed.