Patent ID: 6975264

Claim:
A method of separating an unknown signal emission from a known interference signal in a system incorporating frequency filter means with controllable frequency converting means, the method comprising the steps of: (a) receiving and frequency converting a mixed signal at the frequency converting means, which mixed signal comprises a first signal component representative of the unknown signal emission and a second signal component representative of the known interference signal, the first signal component having a single frequency or a plurality of frequencies associated herewith; (b) stopping a coherent signal component representative of the second signal component at a selected frequency stopband region associated with the frequency filter means; (c) transmitting an incoherent signal component representative of the received first signal component through a selected frequency-transparent region associated with the frequency filter means; and (d) reconverting the transmitted incoherent signal component with reference to a predetermined signal so as to restore the unknown signal emission at its said single frequency/said plurality of frequencies.