| 摘要 |
PURPOSE:To control secrecy of a information and to reduce quality deterioration of the picture recovered with a standard method by converting address data according to a scramble effect control signal in a key signal. CONSTITUTION:An inputted picture signal input is converted to a digital signal with an A/D converter, and is written in one line memory 13 and 14 alternatively. The initial value of a counter is set to any desired value based on the information of the key signal in an address control circuit 12, and reading is initiated from the picture data of one line on the way until it returns to that starting address. This reverses the picture horizontally. After reversing the san line horizontally, the picture signal is written in one field memories 20 and 21 and reread. In this case, the information of the key signal is supplied to the address control circuit 22 to read a horizontal scanning picture signal random, and to reverse the picture vertically for scramble process. |
