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:
Feb. 13, 2001
Filed:
Mar. 01, 1999
Nobuo Taketani, Hyogo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a signal processing circuit for separating a color video signal into a luminance signal and a chrominance signal, whether the correlation relating to the high frequency component of luminance signal and chrominance signal of color video input signal is high or low before and after one horizontal scanning period is detected by a vertical correlation detecting circuit, and the presence or absence of correlation of the detected output signal in the horizontal scanning line is detected by a horizontal correlation detecting circuit. The output signal of the horizontal correlation detecting circuit before and after one horizontal scanning period is supplied into a logic circuit, and depending on the gate output signal obtained therein, the high frequency component of luminance signal and chrominance signal before and after one horizontal scanning period are processed in an operation processing circuit, and a chrominance signal is delivered. Furthermore, this chrominance signal can be obtained through a variable filter circuit capable of changing over the band pass characteristic depending on the output signal of the logic circuit.