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. 03, 1988
Filed:
Mar. 06, 1987
James H Wilkinson, Yokohama, JP;
Sony Corporation, Tokyo, JP;
Abstract
A component digital video signal is encoded such that first and second color components CB, CR are modulated on the lower sideband of a carrier at the Nyquist frequency of the luminance component Y. The encoding method involves alternately adding and subtracting the luminance and color component signals Y+C, Y-C, Y+C, Y-C, (etc) and changing the phase relationship between this addition and subtraction for the first and second color components every field, so that in each alternate field the addition and subtraction operations are in phase for both color components CB, CR and in every other field, the operations are out of phase. Upon decoding, the encoded video signal is comb filtered to recover the luminance component Y and color components CB, CR, and the correct phase for the color components (CB, CR) is restored by a phase alternation operation which is inverse to that applied during encoding.