| 摘要 |
PURPOSE:To make a signal input to a main-sub picture system circuit simple and sure, by controlling a main-sub switching signal and process switching signal that switches the picture processing mode and a selection signal that selects an external video signal by the logically converted output and thereby using field memory in common. CONSTITUTION:Internal tuners 2, 3, a remote control transmitter 8 that inputs plural external video signals and a microcomputer 10 are provided in a two- picture TV receiver, and each signal is selected by main-sub picture signal selecting circuits 6, 7. Various timing generating circuit 21 is controlled by the computer 10, and the frequency of VCO is controlled by the fixed reference voltage at the time of stop processing. Picture data accumulated in a subpicture system circuit is read out in a digital signal processing circuit 26 by using an output of the circuit 21. A circuit 26, a main-sub brightness signal switching circuit 18, a main-sub color signal switching circuit 19 are controlled by the various timing signals sent from the circuit 21. Field memory is used in common, and a signal input to the main-sub picture system is made simple. |
