VIDEO SIGNAL TRANSMISSION METHOD, SUPERIMPOSITION INFORMATION EXTRACTION METHOD, VIDEO SIGNAL OUTPUT AND RECEPTION DEVICE, AND VIDEO SIGNAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To prevent disappearance and deterioration of the superimposed additional information and to increase the superimposable additional information content by performing the spread spectrum of the additional information to secure the data of the same contents within a single horizontal or vertical section and then superimposing the produced spread spectrum signal on a video signal. ;SOLUTION: At a PN iteration part 18 of a video signal output device, the PN code string that is generated at a PN generation part 17 for every second horizontal section is repeated for every subsequent horizontal section. Thus, a PN code string that is continuous in two horizontal sections is generated for every horizontal section. The PN code string generated at the part 18 is supplied to an SS duplicate prevention control signal generating part 14. The part 14 performs the spread spectrum of a duplicate prevention control signal S4, which is extracted at a duplicate prevention control signal extraction part 13 by means of the PN code string and produces a duplicate prevention control signal S5, which undergone the spread spectrum and is superimposed on a video signal S3.;COPYRIGHT: (C)1998,JPO