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Definition of "echo canceller" |
in telephony, a filter that removes echoes caused by leakage of the transmitted signal through a hybrid. The hybrid is the interface between two wire (local) and four wire (long-distance) facilities, and separates inbound and outbound signals. Echo cancellers are used in analog telephony to cancel echoes from signals that traverse the entire round-trip connection, and in fullduplex voiceband modems, where the echo is due to leakage through the near-end hybrid. |
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