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Improvements in Acoustic Feedback Margin in Sound Reinforcement Systems

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Acoustic feedback stability is a fundamental limitation of all public address, sound reinforcement, and duplex teleconferencing systems. Over the past 30 years, a number of techniques have been developed to help improve the gain before feedback margin. This paper reviews progress to date and demonstrates that a new class of loudspeaker, the distributed mode loudspeaker, inherently possesses a number of characteristics that potentially make it less prone to feedback. Initial experiments are reported that show a 4-dB improvement in feedback margin without electronic assistance, which are gains comparable with most other current signal processing techniques.

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