Automatic tuned interference signal rejection filter including drift compensation means
Abstract
Abstract AN AUTOMATIC TUNING FILTER APPARATUS FOR REJECTING AN INTERFERENCE SIGNAL APPLIED THERETO INCLUDING A BRIDGED-T NETWORK HAVING A FREQUENCY RESPONSE CHARACTERISTIC SUCH THAT IT PROVIDES NARROW BAND REJECTION AT A FIRST OUTPUT TERMINAL AND NARROW BAND PASS AT A SECOND OUTPUT TERMINAL, THE RELATIVE PHASE OF THE INTERFERENCE SIGNALS AT THE RESPECTIVE OUTPUT TERMINALS BEING DETERMINED ACCORDING TO WHETHER THE FILTER IS TUNED ABOVE OR BELOW THE FREQUENCY OF THE INTERFERENCE SIGNAL. A PHASE DETECTOR RESPONSIVE TO THE OUTPUT SIGNALS DRIVES AN INTEGRATOR TO PRODUCE A CONTROL SIGNAL FOR ADJUSTING THE CAPACITANCE OF VARACTOR DIODES INCORPORATED IN THE FILTER SO AS TO TUNE THE FILTER TO THE INTERFERENCE FREQUENCY.
Inventors
- 👤 William J Urell
Bibliographic Details
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