Video signal transmission method, superimposed information extraction method, video signal output device, video signal receiving device, and video recording medium

摘要

A superimposing position setting unit uses a video synchronizing signal from a synchronization separating unit as a reference signal, and generates a superimposing position indicating signal S4 for indicating an effective image plane interval of a video signal as a superimposing interval during which an SS duplication control signal is superimposed. An SS duplication control signal generator generates a PN code sequence repeating every one vertical interval, and spreads the spectrum of a duplication control signal S3 by using the PN code sequence to form an SS duplication control signal. The SS duplication control signal is outputted to the effective image plane interval on the basis of the superimposing position indicating signal S4, and is superimposed on the video signal during the effective image plane interval of the video signal by an adder. Thus, the method according to the invention is able to prevent removal and deterioration of added information spread in spectrum and superimposed on the video signal and to securely provide the added information superimposed on the video signal.