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acoustic feedback

noun, Electronics.
1.
(in an audio system, especially a public-address system) the feedback of sound from a loudspeaker to a microphone, often resulting in a whistling noise caused by electrical oscillations.
Also called feedback.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for acoustic feedback
  • Acoustic coupling is often ineffective as it is susceptible to noise, poor coupling of the phone earpiece, and acoustic feedback.
  • Consumers would have to try using an earphone with their own hearing aid in order to determine if acoustic feedback occurs.

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