H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/45, 350/56
H04N 5/38 (2006.01) H04N 5/272 (2006.01) H04N 7/08 (2006.01)
Patent
CA 1173952
ABSTRACT OF THE DISCLOSURE The invention relates to a television system comprising a means for superimposing a marking code on one of the pictures to be televised and a decoder able to detect the presence of this code in the pictures. The said marking code is formed by a first vertical strip constituted by a periodic sequence of alternately white and black areas, said strip being positioned along one of the lateral edges of the picture and by a second vertical strip constituted by a sequence of white or black areas, each extending over a height equal to the period of said sequence formed by the first strip, said second strip being located along the other lateral edge of the picture. The video signal corresponding to a picture having received such a code thus incorporates black or white signals located at the start and finish of a scanning line. The decoder comprises a circuit for detecting, in the video signal which it receives, the presence of white and black signals located at the start and finish of the line and for recognising, on the basis of the thus detected signals, the presence of said code and for transmitting a control order.
372096
Degoulet Gabriel
Gaucher Gilbert
Gauthier Christian
Etablissement Public de Diffusion Dit "telediffusion de France"
Etat Francais Represente Par Le Secretaire D'etat Aux Postes Et Telecommunicat
Goudreau Gage Dubuc
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