Echo canceller for a long-distance telephone network

Details Echo canceller for a long-distance telephone network Echo canceller for a long-distance telephone network

H - Electricity

04

M

379/64

H04M 5/16 (2006.01) H04B 3/23 (2006.01) H04M 1/74 (2006.01)

Patent

CA 1178731

ABSTRACT An echo canceller eliminates undesirable echo appearing in a long distance digitized telephone network of the type in which incoming and outgoing digital signals have mutually different sampling rates. The echo canceller com- prises a sample interpolator for converting the incoming digital signal into one having the same sample rate as the outgoing digital signal. An echo estimator responsive to the output of the sample interpolator produces an estimated echo signal to cancel by subtraction the echo signal present in the unprocessed digital signal.

386719

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