Digital Network Echo Cancellers Series G: Transmission Systems and Media, Digital Systems and Networks International Telephone Connections and Circuits - Apparatus Associated with Long-Distance Telephone Circuits Study Group 15
Echo cancellers are voice operated devices placed in the 4-wire portion of a circuit (which may be
an individual circuit path or a path carrying a multiplexed signal) and are used for reducing the echo
by subtracting an estimated echo from the circuit e