NOISE REJECTION DEVICE Russian patent published in 1999 - IPC

FIELD: broad-band signal communication systems. SUBSTANCE: with combination of useful signal U_s and noise U_n, where U_n ≫ U_s, arriving at device input, AGC controls noise with the result that constant- amplitude noise is applied to reference input of synchronous phase filter shaping noise estimate across output of this filter, its signal input being supplied with voltage from subtracter output. Noise estimate is passed through second amplifier and arrives at one of subtracter inputs to reject noise in useful signal and noise combination arriving at other input of subtracter. Analyzer whose inputs are respectively connected to subtracter output and to device input functions to detect its input across which useful signal is much higher than noise. Upon arrival of useful signal and noise combination in which U_s≫ U_n, input signal of device is passed to its output. EFFECT: improved noise immunity. 3 dwg