Acoustic feedback in sound reinforcement systems is an ever-present threat to the quality and intelligibility of the reproduced sound. It is also the major factor limiting the amount of usable gain which might otherwise be realized. Just as microphones, speakers, and acoustical materials have been improved over the years, so have electronic techniques been developed to overcome or at least minimize the adverse effects of acoustic feedback. However, successful treatment of the typically persistent and tricky feedback problem still exacts a relatively high price. Since the feedback phenomenon is common to all sound reinforcement systems of whatever size, it is desirable to develop new techniques and associated electronic hardware that will accomplish the elimination of feedback frequencies through a simple, straightforward procedure requiring a minimum of training to apply and using affordable equipment which will prove practicable for even low-cost sound reinforcement systems.
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