Sometimes even if only one of the phones’ mic is on.
In: Technology
The weird sounds are a result of feedback. When a sound is made nearby two phones that are on speaker, phone one is producing a sound (output) and its being received by the second phones input. The second phone then reproduces the sound through its output which is then received by the first phones input. The cycles continues in a feedback loop, as each output reproduced increases the amplitude of the signal. The signal is broken when the sound either is too quiet to be picked up by an input or if any part in the loop (input, output, input, output, etc.) is broken.
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