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Feedback could be thing of the past
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Feedback could be thing of the past

2008-04-02
Newsfeed

UK researchers have said they have invented a way to banish feedback at concerts.

UK researchers have said they have invented a way to banish feedback at concerts.While some performers have harnessed the squealing noise to their advantage, the sound has long irritated bands and audiences.New Scientist reported that a team from the University of London has developed software that automatically lowers frequencies to prevent feedback occurring.Feedback happens when a particular frequency reaches a critical volume that causes it to be recaptured by microphones and sent to the speakers.The microphones then pick up the frequency again, creating a loop. Eventually the system becomes saturated and a squealing noise is produced.Joshua Reiss, of the Centre for Digital Music at Queen Mary, University of London, said the new software prevents feedback rather than cancelling it out, freeing sound engineers to focus on music quality.During a performance the software lowers a frequency slightly when it rises above its critical volume but also lowers the other frequencies to keep the balance of sounds.Copyright © The Press Association 2008

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