Adaptive filter for producing an echo cancellation signal in...

Details Adaptive filter for producing an echo cancellation signal in... Adaptive filter for producing an echo cancellation signal in...

H - Electricity

03

H

340/72, 328/0.3

H03H 21/00 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1265854

ABSTRACT: Adaptive filter for producing an echo cancellation signal in a transceiver system for duplex digital communication through one single pair of conductors. Adaptive filter for producing an echo cancellation signal in a transceiver system arranged for digital communi- cation in the duplex mode via one single pair of conductors, the filter comprising delay means (8) having N terminals for delaying the N most recently transmitted symbols, an addres- sing circuit (10) having N input terminals (M < N), each of which is coupled to the terminals 1 to M of the delay means, the addressing circuit forming from the signals applied to the input terminals an address for a memory (11) in which for each of these addresses always a first correction signal is stored; a weighting and summing arrangement (9) having N input terminals coupled to the N terminals of the delay means, the arrangement providing a second correction signal which is a weighted sum of all the signals at the input ter- minals thereof, means (12) for adding together the first correction signal and the second correction signal and an adaptive control loop (13).

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