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. 11, 1993
Filed:
May. 28, 1992
Kouichi Inoue, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An A/D converter converts a composite video signal to a digital signal. A bandpass filter extracts a chroma signal-A sinX from the composite video signal in digital form. A delay circuit delays the chroma signal-A sinX by 1/4 fsc to output-A cosX. Delay circuits delay the chroma signal-A sinX by 1/2 fsc to output A sinX. A ROM stores values of -(1 - cos.theta.) and sin.theta.. Values of -(1 - cos.theta.) and sin.theta. are read from the ROM in accordance with a phase modulation amount .theta. of a voltage controlled oscillator. A multiplier multiplies a value of sin.theta. read from the ROM and A cosX output from the delay circuit. A multiplier multiplies a value of -(1 - cos.theta.) read from the ROM and A sinX output from the delay circuit. An adder adds outputs of the multipliers. Delay circuits delays the composite video signal output from the A/D converter. An adder adds an output of the adder and the composite video signal output from the delay circuit.