Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1991-12-11
1994-10-11
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455307, 455318, 307529, 328167, 333 171, 333168, H04B 112, H04B 126, H03B 1910
Patent
active
053555333
ABSTRACT:
This invention provides a method and circuit for separating a signal of interest from a composite signal including a signal of interest and an angle modulated interfering signal, in which an in-phase component of a reference signal representative of a composite signal is mixed with the composite signal to produce a first compound signal, selected components from the first compound signal are removed to produce a first filtered signal, and the in-phase component of the reference signal is mixed with the first filtered signal to produce a second compound signal. Similarly, a quadrature component of the reference signal is mixed with the composite signal to produce a third compound signal, selected components from the third compound signal are removed to produce a second filtered signal, and the quadrature component of the reference signal is mixed with the second filtered signal to produce a fourth compound signal. The second and fourth compound signal are combined to produce an output signal in which the spectral power density of the signal of interest is greater than the spectral power density of the interfering signal. In an alternative embodiment, the reference signal may be derived from either a the first or third compound signal or both. The reference signal may alternatively be representative of the interfering signal.
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Urban Edward F.
Wisler Mark D.
Xetron Corporation
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