(n.) A phenomenon that occurs when the sound from a loudspeaker is picked up by the microphone feeding it, reamplified by the same loudspeaker into the same microphone, and reamplified in a loop. Each time the signal becomes stronger until the system is overloaded and rings or feeds back on itself, producing a loud howling or squealing sound. These buildups occur at particular frequencies called feedback frequencies.
acoustic feedback
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