| 摘要 |
PURPOSE:To select automatically receiving of the reproducing signal of a VTR or receiving of the TV signal, by switching automatically the circuit of the TV receiver by presence or absence of the reproducing signal of the VTR. CONSTITUTION:When the reproducing signal of VTR1 is input to TV receiver 2, the synchronizing signal is output from the synchronizing separating circuit 6 of indicating circuit 5, and the H-level signal is obtained from detecting circuit 8. By this H-level indication signal, change-over switch 10 is connected to the contact (a) side, and the reproducing signal of VTR1 is projected onto cathode-ray tube 13. When the reproducing signal of VTR1 is not input to TV receiver 2, the output of detecting circuit 8 becomes L level; and by this L-level indication signal, change- over switch 10 is connected to the contact (b) side, and the TV signal is projected onto cathode-ray tube 13 through video amplifying circuit 12. |
