Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2008-01-01
2008-01-01
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S222000, C375S350000, C375S285000, C375S258000, C375S257000, C379S406010, C379S377000, C379S417000, C379S416000, C379S415000, C455S295000, C370S201000
Reexamination Certificate
active
07315592
ABSTRACT:
A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel unwanted differential mode noise that coupled onto the differential signal. In one embodiment a multi-channel communication system utilizes two or more channels that are in close proximity to other alien channels. A common mode signal isolation unit is configured to isolate common mode noise. The common mode noise signal is processed with a filter or other means to generate a cancellation signal. The cancellation signal is combined with the differential signal to thereby cancel noise that coupled onto the differential signal. The processed common mode noise signal may be made to approximate the differential mode noise signal. The common mode signal may be obtained from a center tap of a transformer, or a sensing winding of a three winding transformer.
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Itri Benedict A.
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Tsatsanis Michail Konstantinos
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Fan Chieh M.
Fotakis Aris
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