| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a synchronization system for an image signal processing system from which a High Vision system image signal is outputted by employing a solid-state image pickup element for a standard television system image signal with a simple configuration. SOLUTION: In this system, no PLL circuit is used and no phase comparator is used because an image pickup device and an image signal processing unit are synchronized only with transmission of a frame pulse, and a single crystal oscillator 31 is adopted for a voltage-controlled crystal oscillator. When a changeover switch 35 is used to select an output oscillation signal from an NTSC crystal oscillator 34, the image pickup device and the image signal processing unit are operated by the same frame frequency of nearly 29.97Hz. In the case that an output oscillation signal from a High Vision crystal oscillator 33 is selected, an error of nearly a half of a line of the NTSC system is produced for a frame period. Various timing signal generator 32 for the image pickup device is reset by the frame period of the image signal processing unit regardless of the error. A reset timing is taken within a vertical blanking period of the image pickup device.</p> |
