METHOD FOR TRANSMITTING VIDEO SIGNAL, METHOD FOR EXTRACTING SUPERIMPOSED INFORMATION, VIDEO SIGNAL OUTPUT DEVICE, VIDEO SIGNAL RECORDING DEVICE AND VIDEO SIGNAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To promptly and accurately extract additional information spectrum spread and superimposed on a video signal by superimposing the spectrum spread additional information on every other video signal interval having correlation. SOLUTION: A PN code queue S5 transmitted from a switch circuit SW on every other vertical interval is supplied to as SS duplication preventing control signal generating part 16. The SS duplication preventing control signal generating part 16 performs spectrum spread on a duplication preventing control signal S3 using the PN code queue S5, generates the spectrum spread signal S6 of the duplication preventing control signal, and supplies this to a D/A converting circuit 192. The D/A converting circuit 192 converts the signal S6 into an analog spectrum spread signal S6A and supplying to an adding part 17. The adding part 17 superimposes the signal S6A to an analog video signal S2A, generates and outputs an analog video signal S7A to supply to a monitor receiver and a recording device or the like.