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:
Aug. 16, 1994
Filed:
Dec. 04, 1992
Mitsumo Kawano, Saitama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A low range chroma signal reproduced from a recording medium is converted in the frequency by a frequency converter to obtain an original carrier chroma signal, then the carrier chroma signal is passed through a comb filter for removing a crosstalk and is output further through a phase shifting circuit, a burst signal of the phase shifting output is compared in the phase with a reference signal, the phase comparing output is smoothed by a filter, is then fed to a controlling terminal of a variable oscillator to control the oscillating frequency and is fed to a controlling terminal of the above mentioned phase shifting circuit to control the phase shifting amount. In this formation, a sub-APC loop including no comb filter is superimposed on a conventional APC loop and a response can be made until a high frequency. A color irregularity in a high frequency range (high range phase fluctuation of a carrier chroma signal) which has not been able to be removed can be reduced.