| 摘要 |
A synchronization signal generating apparatus comprises a cycle setting section, a pulse masking section, and a pulse generating section. The pulse masking section outputs a pulse train based on an input pulse train and cycle information. The pulse generating section outputs a pulse train based on the pulse train and cycle information output from the pulse masking section. When a synchronization signal is switched from the state of being in synchronization with the pulse train input from the pulse masking section to the independent state, the cycle setting section switches the cycle information upon receiving a pulse of the pulse train for the first time since a cycle selection signal was changed. On the other hand, when the synchronization signal is switched from the independent state to the state of being in synchronization with the pulse train input from the pulse masking section, the cycle setting section switches the cycle information after receiving a pulse of the pulse train since the cycle selection signal was changed.
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