Patent ID: 6163565
Filing Date: 2000-12-19
Classification: H04N

Abstract:
An additional information signal superimposing and detecting system, including an information outputting apparatus for outputting an information signal with additional information by superimposing said additional information on said information signal, for receiving said information signal with said additional information from said information outputting apparatus and detecting said additional information, said additional information signal superimposing and detecting system comprising:first spread code generating means for generating a first spread code including a plurality of chip sections corresponding to each of a plurality of blocks of information signals divided for data of a predetermined amount;spectrum spreading means for spectrum spreading an additional information signal through said first spread code and generating a spread additional information signal;signal superimposing means for superimposing said spread additional information signal on said information signal and generating said information signal with said additional information;compressing means for discrete cosine transforming said information signal with said additional information for each of said plurality of blocks and converting said information signal with said additional information from a time-base area signal to a discrete cosine transform (DCT) coefficient in a frequency area, and for data compressing said information signal with said additional information and generating a compressed information signal;signal extracting means for extracting a DC component of said DCT coefficient from said compressed information signal;second spread code generating means for generating a second spread code equal to said first spread code on the basis of said information signal with said additional information; andinverse spectrum spreading means for inverse spectrum spreading said DC component of said DCT coefficient extracted by using said second spread code and detecting said additional information signal from said compressed information signal.