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Adaptive Equalizer for Acoustic Feedback Control

An adaptive equalizer can be used to reduce the possibility of acoustic feedback in audio applications involving amplified closed loop systems, such as in public address configurations. The equalizer decreases the gain at those frequencies where feedback is likely to occur. Using a computationally efficient algorithm based on a short-term Fourier transform, the equalization curve is determined by using information obtained from an adaptively estimated feedback path. Using the proposed scheme, feedback gain is reduced before ringing and howling artifacts become noticeable since the estimated feedback path provides rapid indication of the frequencies that are vulnerable to excessive feedback. A real time test illustrates the functionality of the algorithm.

JAES Volume 61 Issue 12 pp. 1015-1021; December 2013
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AES - Audio Engineering Society