Patent Number: 6,295,303

Title: Method and device of superimposing an additional information signal on avideo signal and detecting said additional information from said videosignal

Abstract: A method of superimposing additional information on a video signal,transmitting it, and detecting the additional information from thetransmitted video signal. The additional information is synchronized witha sync signal in the video signal, and generated in N(N.gtoreq.1) unitintervals of one field of the video signal. Some predetermined unitintervals of the additional information generated in N(N.gtoreq.1) unitintervals of one field of the video signal, are phase-inverted. Theadditional information is identified by detecting the information in unitintervals based on the sync signal in the video signal, and detecting thatinformation in some predetermined unit intervals is inverted. Theadditional information is identified by detecting the information in unitintervals, and integrating the detection results with the information ininverted predetermined unit intervals inverted.

Inventors: Ogino; Akira (Tokyo, JP), Ikeda; Nozomu (Tokyo, JP), Kimura; Yuji (Kanagawa, JP), Moriwaki; Hisayoshi (Tokyo, JP), Kohashi; Takashi (Tokyo, JP)

Assignee:

International Classification:

Expiration Date: 09/25/2013