The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 1987
Filed:
Jun. 21, 1985
Franco Toffolo, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
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.