An echo control device that blocks the echo reflections by switching off the transmission path from the listening party to the talking party. Usually used on trunks longer than 3,000 km.
A device for connection to a two-way telephone circuit to attenuate echo signals in one direction caused by signals in the other direction.
An active device used by the phone company to suppress positive feedback (singing) on the phone network.
A device used to eliminate the echo effect of long distance voice transmission circuits. This suppressor must be disabled for full-duplex data transmission; the modern answer tones turn the suppresso ... more
An echo suppressor (sometimes "echo suppresser") 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 supplanted by better performing echo cancellers.