U.S. Philips Corporation

Siemens Vdo Ag

Franco Toffolo

Pieter Meijer

Christiaan Marie Hubertus Banziger

An antenna diversity receiver is disclosed. The diversity receiver has a multipath detector for controlling an antenna selective switching circuit. The switching circuit couples one of a plurality of antennas to a RF receiver input. The receiver allows suppression of adjacent channel interferences without unwanted side effects by employing a switching disabling circuit to automatically disabling the switching circuit when the signal delay between the occurrence of multipath distortions in the RF reception signal and the switching between antennas exceeds a predetermined critical signal delay value.

Antenna diversity receiver

Noise detector for detecting noise pulses in a non-limited radio broadcast signal modulated on a carrier, comprising an amplitude detection circuit and coupled thereto a first signal comparison circuit having a signal input and a threshold input, a first threshold signal depending on the average input level of the noise detector and a second threshold signal depending on the noise pulse repetition frequency being applied to this threshold input. To limit the repetition frequency of the detection output signals of the noise detector without reducing the input sensitivity, the threshold level of the noise detector is controlled in forward direction in dependence on the field strength and the noise pulse repetition frequency. To that end the amplitude detection circuit is connected through a signal input to an input of the noise detector and through an envelope output to the signal input of the first signal comparison circuit and also to a signal input of a second signal comparison circuit, this envelope output also being coupled to a first low-pass filter for forming the first threshold signal, which first threshold signal is applied to the threshold input of the first signal comparison circuit and a threshold input of the second circuit, this second circuit being coupled through a second low-pass filter for forming the second threshold signal to the threshold input of the first circuit.

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Eindhoven, Netherlands

Franco Toffolo