| 摘要 |
PURPOSE:To obtain a pattern without jitter even when a locked sampling clock is used for a burst signal by controlling a sampling clock in phase with the output of a horizontal phase difference detecting circuit detecting the phase difference between a horizontal pulse and an inputted synchronizing signal. CONSTITUTION:A phase control circuit 14 is inserted to the output terminal of a voltage controlled oscillator 7, the horizontal phase error data obtained through a low pass filter 12 controls the sampling clock in phase to match the phase between the luminance signal and the horizontal synchronizing signal, an operation device 15 separating a color difference signal from a comb line filter 2 into an R-Y signal and a B-Y signal is inserted, the hue is controlled by supplying a horizontal phase error data to the operation device 15 to correct jitter of the hue. The horizontal phase detecting circuit 9 consists of a circuit multiplying the synchronizing signal with the horizontal pulse and a phase error data with high luminance is obtained from the sampling interval. A phase control circuit 14 consists of transistor gate connected in series and the phase is adjusted minutely by utilizing a delay time of the gates to control the number of stages in series by means of phase information. |
