Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1994-02-14
1994-11-08
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379410, 379202, 370 321, H04M 356
Patent
active
053634411
ABSTRACT:
Distortion and instability due to echoes in conference communications is reduced through the use of an echo estimating filter disposed in a conference bridging circuit. This circuit includes a signal combiner which receives information signals from each of the parties in the conference communications and provides an output signal which is a combination of the received information signals and an echo compensation signal. The echo estimating filter provides this echo compensation signal in response to the combiner output signal. Advantageously, the echo estimating filter can be fixed or adaptive. In the latter case, the adaptation can be in response to the received information signals or to training sequences.
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Feiner Alexander
Im Gi-Hong
Kneuer Joseph G.
Saltzberg Burton R.
Werner Jean-Jacques
AT&T Bell Laboratories
Dwyer James L.
Fournier Paul A.
Padnes David R.
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