| 摘要 |
PURPOSE:To prevent variation of the rise point of a ghost detecting timing pulse due to the fluctuation of temperature or power supply voltage, by providing a weighting coefficient correcting circuit which gives an adverse transmission function corresponding to each ghost to a transversal filter. CONSTITUTION:A vertical synchronizing signal is applied to a data input terminal 13 of a D type FF, and a clock of 2nfH is applied to a clock terminal 14. This clock is then applied to a clock terminal CK of the D type FF via an inverter 15 as well as a clock terminal CK of an N-bit counter 17. The vertical synchronizing signal and an output Q' of the D type FF are applied to a reset terminal R of the counter 17 through an AND gate 16. Outputs Q0-Qn of the counter 17 are made to pass through a decoder 18 to obtain a ghost detecting timing pulse at a terminal 19. In such a way, the ghost detecting timing pulse can be obtained stably despite the temperature change or the fluctuation of the power supply voltage. |
