| 摘要 |
The invention relates to an arrangement for transmitting an indication signal 7b; 107b between the video equipment of two telephone subscribers. The symbol is to appear in an identical position on the subscribers' video screens. According to the invention, the subscribers each have their own equipment for this purpose. This equipment comprises a memory 7a; 107a containing a pattern for the symbol, a counting device 11b, 14; 111b, 114 which traces the coordinates of the image beams on the video screen and a registration device 8, 9; 108, 109 in which the required coordinates for the symbol can be entered. A comparison circuit 12, 15; 112, 115 compares the content in the counter and in the registration device. In the event of agreement, the comparison circuit emits a signal that starts the reading off of the pattern in the memory. A mixer circuit 18; 118 mixes the signals from the memory with the video signals that are displayed on the screen. At least one subscriber has a writing device 16, 17 in order to be able to write in his register the required position for the symbol. A transmitting device 19, 22; 119 between the subscribers transmits the information about this position to the registration device of the second subscriber. <IMAGE> |
