Adaptive echo cancellation used with echo suppression to reduce

Details Adaptive echo cancellation used with echo suppression to reduce Adaptive echo cancellation used with echo suppression to reduce

1995-02-17

1998-12-22

Bost, Dwayne

Telephonic communications

Echo cancellation or suppression

379406, 379409, 379411, H04M 100

Patent

active

058526617

ABSTRACT:
A DECT Base Station Unit for canceling hybrid echoes and suppressing network echoes. The DECT Base Station Unit includes a hybrid that connects a two-wire loop to a four-wire loop, an adaptive balance filter that receives a near-end transmit signal over two wires of the four-wire loop and receives a residual error signal over another two wires of the four-wire loop. The adaptive balance filter outputs an hybrid echo negating signal to a adder. The adder also receives an output from the hybrid that includes a transmit far-end signal and a reflected portion of the near-end transmit signal, and the adder outputs a residual error signal. The DECT Base Station Unit further includes an echo suppressor, an echo suppressor controller for controlling an attenuation level of the echo suppressor, and a decorrelation controller for sending enable/disable signals to the echo suppressor controller and the adaptive balance filter based on a level of correlation between the near-end transmit signal and the residual error signal.

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patent: 5428681 (1995-06-01), Andre

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