Undesired signal canceller

Details Undesired signal canceller Undesired signal canceller

1978-11-21

1981-02-10

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Time domain filters

333 17R, 333 18, 333 19, H03H 1500, H03H 730

Patent

active

042504724

ABSTRACT:
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 subtracter for subtracting the composite signal from an input signal.

REFERENCES:
patent: 3732410 (1973-05-01), Mackechnie
patent: 3956585 (1976-05-01), Butler et al.
patent: 4127874 (1978-11-01), Iwasawa et al.

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