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. 11, 1987
Filed:
Dec. 04, 1984
Shigemitsu Yamaoka, Hamamatsu, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
A digital color encoder for producing color TV signal comprises primary color image signal sources, a sampling signal generator, coefficient memories, multipliers and an adder. The primary color image signal sources provide digitized color image signals respectively of red, green and blue. The sampling signal generator generates a sampling clock having a frequency three times as high as that of the chrominence subcarrier and provide three phase sampling signals for 0.degree., 120.degree. and 240.degree. having a frequency as same as that of the chrominence subcarrier. The coefficient memories provide coefficients for 0.degree., 120.degree. and 240.degree. for the respective color of red, green and blue according to the formula of NTSC color picture signal. The respective color image signals are sampled at the sampling clock frequency and respectively multipled with the respective coefficients in the multipliers, and then added together in the adder. This a composite color video signal is synthesized without use of ordinary subcarrier modulators for B-Y and R-Y.