Receiver with dual D.C. noise cancellation circuits

Details Receiver with dual D.C. noise cancellation circuits Receiver with dual D.C. noise cancellation circuits

2005-02-15

2005-02-15

Gesesse, Tilahun (Department: 2684)

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

C455S276100, C455S226400

Reexamination Certificate

active

06856790

ABSTRACT:
A circuit employing dual adaptive D.C. noise cancellation loops to eliminate D.C. noise from a signal received from a communication channel. The circuit employing the two adaptive D.C. noise cancellation loops is constructed such that the two adaptive D.C. noise cancellation loops are decoupled to insured stability of the circuit while eliminating the D.C. noise components from a signal received from a communication channel. A first D.C. noise canceler generates a first D.C. noise cancellation signal that is a product of an error signal that is an estimate of noise within the signal and a first D.C. gain constant. The first D.C. Noise is connected within the receiver to an input of a decision circuit that subtractively combines the first D.C. noise cancellation signal with the signal to remove a first portion of the D.C. noise components. A second D.C. noise canceler additively restores the first D.C. noise cancellation signal to the error signal and multiplies the restored error signal with the first D.C. noise cancellation signal by a second D.C. gain constant. The second D.C. noise canceler is connected to the input of the receiver to subtractively combine the received signal acquired from the communication channel with the second D.C. noise cancellation signal to remove a second portion of the D.C. noise components.

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