| 摘要 |
PURPOSE:To extract a desired program rapidly, by providing a memory which receives a television multiple signal, where different binary information are superposed on plural horizontal scanning lines in the vertical blanking interval, and searches and stores numbers of respective horizontal scanning lines. CONSTITUTION:In case that desired binary information selected by a selecting circuit 34 is superposed on the 20th H, an increment pulse generating circuit 26 is controlled by the function of a timer B36 to count up a counter 16 and a gate pulse for each H is obtained for detection on the 17th H-the 19th H. When identification signals IDC coincide on the 20th H, a program code signal which a slice circuit 4 outputs is stored in a program latch circuit 31. A program code designated by the selecting circuit 34 is stored in an program designating circuit 33, and both program codes are compared by a coincidence detecting circuit 32; and if they coincide with each other, the timer B36 is cleared. Hereafter, only the signal on the 20th H is extracted. Thus, horizontal scanning lines for selected programs are searched and stored, and hereafter, only signals of these horizontal scanning lines are extracted automatically. |
