What causes the increasing echo noise when two calls are open at the same time in the same room?
In: Engineering
A feedback loop.
One microphone picks up the sound of the other devices speaker and amplifies it a little, then it’s played over the speaker and the sound goes through the loop again and again getting louder each time.
Having just one call would cause the same problem (and many propably remember they did) but nowadays the sounds the speaker produced are filtered out of the signal the corresponding microphone picks up by software. This doesn’t work with 2 independant devices though.
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