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

Acoustic feedback in sound reinforcing systems is often solved using a notch-filter-based howling suppression technique that depends on having an accurate means of detecting feedback. Many detection algorithms that are based on a single criterion have an unacceptable high false–positive rate when used for music. By combining multiple detection criteria, a novel algorithm reduced the false alarm rate from as high as 33% to as low as 3%. Careful adjustment of various thresholds in the algorithm is required to maximize sound quality. This study provides a unifying framework for evaluating howling detection.

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JAES Volume 58 Issue 11 pp. 923-940; November 2010
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AES - Audio Engineering Society