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.

Authors: Mapp, Peter; Ellis, Christien
Affiliations: Peter Mapp Associates, Colchester, Essex, UK ; New Transducers Limited, Huntingdon, UK(See document for exact affiliation information.)
AES Convention: 105 (September 1998) Paper Number: 4850
Publication Date: September 1, 1998 Import into BibTeX
Session Subject: Sound Reinforcement; Room Acoustics
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=8330

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD aes14)   /pp9798/pp9809/4740.pdf

Start a discussion about this paper!