Patent ID: 7127218
Filing Date: 2006-10-24
Classification: H04B

Abstract:
1. A scanning antenna diversity system for FM radio for vehicles, having an antenna system having a controllable logic switching device, in which a different high-frequency reception signal, in terms of diversity, is passed to a receiver with different switching positions, in each instance, and an IF reception signal at the output of the receiver derived from this reception signal is coupled to the input of a diversity processor, which switches the logic switching device into a different switching position if there is reception interference, wherein the diversity processor comprises; a first interference detector having its input coupled to the IF reception signal ( a second interference detector having its input coupled to the IF reception signal whose interference indicator signal at its output is obtained from the same IF reception signal, but from a time-integral determination of the interference signal contents in frequency gaps kept free of the wanted signal according to the signal standardization of the FM multiplex signals of the FM demodulated IF reception signal ( a logic circuit coupled to the output of said first and second interference detectors for receiving said two interference indicator signals and producing at its output a logic control signal that is connected to the controllable logic switching device for controlling the antenna system, said logic circuit evaluating said interference indicator signals of the two interference detectors, so that a different switching position is selected at the earliest possible point in time after the occurrence of a reception signal that has become unworthy of reception.