Multiplex communications – Duplex – Transmit/receive interaction control
Patent
1995-08-30
1998-08-18
Olms, Douglas W.
Multiplex communications
Duplex
Transmit/receive interaction control
379411, H04B 323
Patent
active
057967253
ABSTRACT:
An echo canceller (30) cancels an echo signal produced on a transmission path (14) on the basis of a received signal received through a reception path (15). The echo canceller comprises an adaptive filter (31) for producing a pseudo-echo signal from the received signal in accordance with tap gains. A producing section (19, 20) produces an error signal representative of an error level between the echo signal and the pseudo-echo signal. A supplying section (21, 32) supplies the adaptive filter with selected tap gains stored in a memory section (18) when the error level is less than a predetermined threshold level. The adaptive filter renews the selected tap gains into renewal tap gains in accordance with the received signal and the error signal to store the renewal tap gains of the selected tap gains in the memory section.
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Jung Min
NEC Corporation
Olms Douglas W.
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