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Question:

Speaker + microphone effect?

Hello.I'd like to know how is that effect called, when the microphone input goes to speaker output and speaker output goes back to microphone, resulting in repeated amplification.Explanations why that happens or links appreciated, thanks.

Answer:

You might have the software that's using the mic to pass through the speakers. So, anything you record will not only be saved to the hard disk or memory, but also come through the speakers as well. The feedback you get is a howling effect. Simply move the microphone further back from the speakers, and also turn the pass through feature off. In place of the speakers you can also use a temporary fix and put headphones in its place. This way you can hear what you're recording too.
It's also called howl around for obvious reasons.
Its called 'Feedback' It's cause by a sound loop between the microphone and the speaker. The sound from the microphone is amplified to the speaker and the sound from the speaker is picked up my the microphone and the loop is completed. Its an example of positive feed back that can lead to instability in all sorts of mechanisms. The microphone should be kept way from the speaker as far as possible and the output not too loud if you want to minimize this effect.

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