| 摘要 |
PURPOSE:To eliminate the need for a circuit to regenerate a main clock from a 1/2 period clock and to avoid the deterioration in the picture quality by providing a delay device separately as a 1st delay device for coarse adjustment and a 2nd delay device for fine adjustment. CONSTITUTION:The delay device is provided separately as a 1/2 period delay device 33 for coarse adjustment and a 1/2 period delay device 37 for fine adjustment. With a switch 32 thrown to the position of a D input terminal, a main clock 14 is inputted to a 4th FF 31, and with the switch 32 thrown to the position of an E input terminal, a 1/2 period delay main clock 14 is inputted to the 4th FF 31. Moreover, a clock 36 outputted from a switch 32 is inputted to a delay device 37, the phase within a 1/2 period is set and a retarded clock 38 is fed to a 5th FF 39. Then an output data 41 from the FF 31 is latched in an FF 39, and a phase within one sampling period is set optionally to a digital data 42. Thus, the circuit constitution is simplified and the deterioration in the picture quality is eliminated. |
