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首页> 外文期刊>Proceedings of the IEEE >An introduction to the paper by van Waterschoot and Moonen - Fifty Years of Acoustic Feedback Control: State of the Art and Future Challenges
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An introduction to the paper by van Waterschoot and Moonen - Fifty Years of Acoustic Feedback Control: State of the Art and Future Challenges

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摘要

Ever since the microphone was first connected to a loud-speaker, acoustical engineers have had to grapple with the unintended consequence of acoustic feedback, a phenomenon that occurs when the sound generating from a loud-speaker inadvertently returns to the microphone in a closed loop. This feedback not only deteriorates sound quality and limits achievable amplification, but its most characteristic feature is the howling effect it creates. In this paper, the authors evaluate current methods available for dealing with the problem and identify the challenges facing future research in developing reliable and affordable solutions to the problem of controlling acoustic feedback. Acoustic feedback is frequently applied only to the howling effect it produces, but it more correctly addresses the root of the problem, namely the underlying acoustic coupling. Methods for managing that problem come under the heading of acoustic feedback control, which may be achieved completely, by dismantling the system, or by the more practical approach of removing the howling artifacts from the loudspeaker signal. Although acoustic feedback control may be effected manually or automatically, engineers for the past 50 years have preferred manual intervention because automatic methods have proved more time consuming and less reliable. Nonetheless, automatic methods for coping with acoustic feedback have advanced markedly in the intervening years, including phase-modulating feedback control, notch-filter-based howling suppression, and adaptive feedback cancellation. Until now, these methods have not been widely publicized because they approached the acoustic feedback problem from different angles, such as reducing signal gain in the loop, suppressing the howling effect, and dismantling the microphone-loudspeaker link.

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