| 摘要 |
PURPOSE:To synchronize a video image due to a projector by allowing each sub equipment to receive a same clock signal of a low frequency from a main device and comparing the phases of clock signals and multiplying them. CONSTITUTION:A phase locked loop circuit 41 (42-4N) and a multiplier circuit 81 (82-8N) in pairs receive clock signals 9 of a low frequency from a main device 1 respectively and compare the phases and multiply them to output a device clock signal 5 of a high frequency respectively. In this case, the main device 1 sends the clock signal 9 of a low frequency such as 1MHz offering easy and simple communication. Thus, sub devices 31,32,...3N, that is, devices 71,72,...7N such as projectors are completely synchronized. |
