H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/104, 325/120
H04B 1/10 (2006.01) H04B 1/16 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1197562
ABSTRACT OF THE DISCLOSURE In a reception system which includes a receiver having a plurality of interconnected stages and a demodulator, and where there appears at an input of the receiver a desired signal which occupies substantially a predetermined bandwidth, and at least one undesired signal which occupies a bandwidth different from, though partially overlapping the predetermined bandwidth, the improvement includes a signal selector coupled to receiver terminals upstream of the receiver demodulator for normally con- tinuously selecting one of the signals appearing across the receiver terminals, a gain-controlled feedback stage connected with one input thereof to an output of the signal selector for negatively feeding back to the receiver terminals one of the signals substantially 180° out of phase with the spectrum characteristic of the undesired signal when the one of the sig- nals is the undesired signal, a frequency-dependent selection device connected to the receiver terminals for selecting the undesired signal, so as to substantially isolate it from any other signals, and a comparator for comparing the output there- at of the undesired signal at least with a reference level, and for generating at least one error control signal, which feeds another input of the gain-controlled feedback device. The reference level is set so as to force any remnants of the undesired signal which still appears at the input of the demodu- lator of the receiver to assume, through the error control sig- nal, a level below a level of the desired signal thereat, which differs from the level of the desired signal by at least such a level difference between the desired and undesired signals, which permits the demodulator to demodulate the desired signal at an acceptable signal-to-noise ratio, so that demodulation of the undesired signal is prevented.
421857
Donath Erwin
Mcfadden Fincham
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