Adaptive analog echo/NEXT cancellation

Details Adaptive analog echo/NEXT cancellation Adaptive analog echo/NEXT cancellation

2010-03-29

2011-12-13

Jamal, Alexander (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

Reexamination Certificate

active

08077859

ABSTRACT:
A physical layer (PHY) device including i) an input configured to receive a first transmit signal transmitted from a remote device, and ii) an output configured to transmit a second transmit signal from the PHY device to the remote device. The second transmit signal causes interference in a receive signal at the input of the PHY device. The PHY device further including a selection module configured to select a first control signal to cancel the interference in the receive signal when the receive signal does not include the first transmit signal and a second control signal to cancel the interference in the receive signal when the receive signal includes the first transmit signal. The interference includes (i) an echo due to the second transmit signal or (ii) crosstalk due to a third transmit signal output by a local PHY device proximate to the PHY device.

REFERENCES:
patent: 6480532 (2002-11-01), Vareljian
patent: 6954530 (2005-10-01), Gunther
IEEE Standards, IEEE Std 802.3-2002; Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications; Mar. 8, 2002.

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