| 摘要 |
PURPOSE:To utilize the entire phase period for transmission of the control signal and thus secure the assured detection at the reception side, by transmitting the secondary scan control signal for the phase signal period. CONSTITUTION:The reading scanning of one line is carried out with clock pulse (d) of reader driving circuit 5 and by reader 1 in the first half of A1 of internal phase signal (h), i.e., for the period of P1. And the binary coded signal is supplied to picture signal deciding circuit 4 through binary coding circuit 3. At the time point when the black signal is detected, the output of one side in circuit 4 becomes H along with the other side turning to L each to be held until the resetting is given at the front edge of period A2. Then picture signal (a) is written into register circuit 13 via clock pulse (d) to be led out of register control circuit 14 and for the period of P2 within external synchronous signal B1. And circuit 14 leads out clock pulse (g) toward picture signal register circuit 13 at the rear edge of signal B1, and then reads out the picture signal of circuit 13 for the period up to the front edge of next B2. This picture signal (j) received the low-speed conversion is transmitted to the reception side from transmission modulating circuit 15. Circuit 15 produces the line skip control signal with the output of circuit 4 to transmit it to the reception side along with signal B. |
