Patent ID: 7027100

Claim:
A superimposing device for superimposing additional information on a signal, said superimposing device comprising: generating means for generating a code used for superimposing said additional information on said signal and for generating a code inversion timing signal; setting means for setting first regions of said signal on which said additional information is superimposed with a non inverted polarity and second regions of the signal on which said additional information is superimposed with an inverted polarity corresponding respectively to a high level interval of said code inversion timing signal or a low level interval of said code inversion timing signal; and superimposing means for superimposing said additional information on said first regions with non-inverted polarity using said code and on said second regions with inverted polarity using said code, wherein said first and second regions are defined on the basis of N (N≧1) chips of said code.