What causes the screeching feedback when you’re on the phone with someone who is in the same location?
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When your voice transmits through a phone, it gets a little bit distorted. Some of that distortion causes it to be slightly higher pitched.
If the sound comes back to the original phone it will transmit again. Again, it is distorted. Now it’s been distorted twice. If the phones are close enough, this keeps happening again and again. The sound goes back through and gets even more distorted. After awhile, it just sounds like a horrible high pitched whirring noise.
If you have two phones close together you can start the feedback by talking into one of them. If they are super close together, even the small background noise might be enough to start it.
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