| 摘要 |
PURPOSE:To eliminate the need for a detector for body detection or synchronism control means, etc., by sending out the output of a gate circuit which allows each photoelectric conversion output to pass together with the detection output of a color component abrupt variation detecting circuit. CONSTITUTION:Outputs of respective photoelectric converting elements P1, P2, and P3 are amplified by amplifying circuits 51, 52, and 53 respectively, A/D-converted by A/D converting circuits 61, 62, and 63, and supplied to input sides of the gate circuit 7. Outputs of the amplifying circuits 51, 52, and 53, on the other hand, are passed through differentiating circuits 86, 82, and 83 to extract variation rate components, which are converted by window comparators 91, 92, and 93 into binary signals. Only when some of outputs of the amplifying circuits 51, 52, and 53 varies abruptly, an OR gate 10 outputs a one-shot pulse. This one- shot pulse is supplied to the gate circuit 7 and a delay circuit 12. The gate circuit 7 opens the gate for a time corresponding to the pulse width of the one- shot pulse to pass outputs of the A/D converting circuits 61, 62, and 63, and they are sent out. |
