Echo suppressor

An echo suppressor (sometimes "acoustic echo suppressor" / AES) is a telecommunications device used to reduce the echo heard on long telephone circuits, particularly circuits that traverse satellite links. Echo suppressors were first developed in the 1950s in response to the first use of satellites for telecommunications, but they have since been largely supplanted by better performing cancellers Acoustic Echo Cancelling
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A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction. (188 )

echo suppressor
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