Undesired signal canceller

Details Undesired signal canceller Undesired signal canceller

H - Electricity

03

H

328/0.3

H03H 7/00 (2006.01) H04B 3/14 (2006.01) H04N 5/21 (2006.01)

Patent

CA 1114906

ABSTRACT OF THE DISCLOSURE An apparatus for cancelling an undesired signal includes a programmable filter in which differential waveforms of a desired signal are superimposed on one another to form a composite signal similar to an undesired signal, a control circuit for detecting a level of the undesired signal to control the gain of a level adjusting circuit of the programmable filter so as to have a value proportional to the undesired signal, and a substrate for subtracting the composite signal from an input signal.

316749

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