Patent ID: 6253020
Filing Date: 2001-06-26
Classification: H04N

Abstract:
A video signal transmission method for transmitting a video signal on which a spectrally spread additional information is superimposed, said video signal transmission method comprising:a spread code generation step for generating a spread code string containing a plurality of chips in 1 horizontal interval or in 1 vertical interval at a generation start timing having a period of an integer number of vertical periods synchronously with a vertical sync signal;a spread code repetition step for repeating said spread code string generated in said spread code generation step over a repetition interval of a plurality of horizontal intervals or a plurality of vertical intervals so that chips having a same data are arranged in a vertical direction or a spatial direction of a time axis direction in a picture unit;a spectral spread step for spectrally spreading an additional information and generating spectral spread additional information so that the same data is in at least one interval in said plurality of horizontal intervals or plurality of vertical intervals in said repetition interval using said spread code string generated in said spread code repetition step; anda superimposition step for superimposing said spectral spread additional information generated in said spectral step on said video signal.