×

SIGNAL CANCELLATION SYSTEM

  • US 3,696,429 A
  • Filed: 05/24/1971
  • Issued: 10/03/1972
  • Est. Priority Date: 05/24/1971
  • Status: Expired due to Term
First Claim
Patent Images

1. A system for cancelling an undesired r-f signal that is produced on a receiver line by a source of interference, comprising:

  • a. means for providing a signal sample portion of the output of said source, b. means for separating said signal sample into first and second quadrature components, c. first control means for controlling the amplitude and phase sense of said first quadrature component and second control means for controlling the amplitude and phase sense of said second quadrature component, d. means for applying said controlled quadrature components to said receiver line, for combination with said undesired signal to produce a resultant r-f signal, e. first and second demodulator means for producing respective outputs corresponding to quadrature components of said resultant signal, and f. means responsive to said demodulator outputs respectively for adjusting said first and second amplitude and phase sense control means to substantially nullify respective quadrature components of said undesired r-f signal.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×