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:
Jun. 28, 1983
Filed:
Jul. 27, 1981
Johannes G Raven, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a noise suppression circuit for a video signal, the input video signal is separated into its high and low frequency components by a separating circuit (3). The signal at an output (15) of a delay circuit (17) is combined with the separated low frequency signal in a combining circuit (11) whose output is applied to the input (19) of the delay circuit (17). The time delay of the delay circuit (17) is switched from field to field by means of a change-over switch (53) so that this time delay changes from field to field to a field period minus and a field period plus half a line period. The noise-suppressed low frequency output from the combining circuit (11) is added to the separated high frequency component in an adder circuit (25). In use such a noise suppression circuit produces substantially no travelling noise patterns on a television display.