| 摘要 |
PURPOSE:To attain the receiving of a screen with high quality and compatible with the current system, by increasing the number of scanning lines per field. CONSTITUTION:A signal received at a receiving circuit 11 is detected at a detecting circuit 12 and applied to a memory circuit 13. Further, a signal from the circuit 12 is applied to a synchronizing separation circuit 14, and a separated synchronizing signal is applied to an address control circuit 15. Then, this address signal is applied to the circuit 13. When the storage capacity for one field share (current system) is provided to the circuit 13, the signal from the circuit 12 and the signal of one preceding field are synthesized to form a signal having double horizontal scanning lines. This signal is applied to a picture tube 17. Further, the signal from the circuit 14 is applied to a deflecting circuit 18 to form a deflecting signal for doubled horizontal frequency number while the vertical frequency remains separated and the signal is applied to the picture receiving tube 17. Thus, the picture having the double horizontal scanning lines are displayed on the picture receiving tube 17, allowing to obtain a picture with high quality. |
