Patent ID: 6147700
Filing Date: 2000-11-14
Classification: H04N

Abstract:
A noise-having reverse signal isolator in a cable television service system, comprising:a divider for dividing a reverse signal into a first signal and a second signal;a bandpass filter for passing only a signal in a noise-susceptible band from the first signal received from the divider;a detector for converting an output of the bandpass filter to a direct current (DC) signal;a DC amplifier for generating an amplified DC signal by DC-amplifying the DC signal output from the detector;a matching resistor having one end grounded and having a predetermined resistance value;a switch having a first input terminal connected to an output of said divider for receiving said second signal, a second input terminal connected to another end of said matching resistor and an output terminal, said switch selectively connecting one of the first and second input terminals to said output terminal; anda controller for determining whether noise exists in the reverse signal by comparing the amplified DC signal output from said DC amplifier with a reference DC signal and controlling said switch based on the determination.