H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/7
H04B 7/15 (2006.01) H04B 7/155 (2006.01) H04L 1/20 (2006.01)
Patent
CA 1239995
ABSTRACT The present invention relates to a digital signal repeater of the type in- cluding a controller for controlling activation/non-activation of a radio trans- mitter. The repeater has an improved controller to avoid activation by inter- ference signals as well as a receiver. The controller is responsive to the out- put of the receiver for providing a control signal controlling the transmitting operation of the transmitter. The controller comprises a first decision circuit for detecting the level of the modulated carrier wave of an intermediate fre- quency band of the receiver and providing a first signal, a second decision cir- cuit for detecting a clock frequency component in the output of the receiver and providing a second signal, logic circuitry responsive to the first and second signals for providing a third signal, a circuit for smoothing the third signal, and a comparator circuit for comparing the output of the smoothing circuit with a reference level and providing the control signal.
489294
Corporation Nec
Smart & Biggar
LandOfFree
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