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:
May. 22, 1990
Filed:
Jul. 21, 1988
Masaaki Kisou, Chiba, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
A circuit for reducing noises of a chrominance signal in a television receiver. The circuit includes a decoder for decoding first and second color difference signals, each including a noise component from a received chrominance signal, a signal subtraction circuit for generating a first frame difference signal in response to two successive first color difference signals and a second frame difference signal in response to two successive second color difference signals, a signal converting circuit for extracting a first compensation signal from the first frame difference signal and a second compensation signal from the second frame difference signal, a noise reduction circuit for reducing noises from the color difference signals in response to the compensation signals, a discrimination circuit for discriminating whether both the first and second frame difference signals are smaller than a prescribed level or not and for generating a control signal in response thereto, and a signal transmission circuit for transferring the compensation signals from the signal converting circuit to the noise reduction circuit in response to the control signal only when both the frame difference signals are smaller than the prescribed level.