发信号：在 Win32 中，发出信号会唤醒等待那个信号的所有线程。
Signaling: In Win32, signaling a semaphore wakes up all the threads that are waiting on the semaphore.
当接收到短脉冲检测开始触发信号时，向自动增益控制放大器(201)输出一个增益控制信号，以便用最大值进行放大。
Upon reception of a burst detection start trigger signal, a gain control signal is output to an automatic gain control amplifier (201) so as to perform amplification with a maximum value.
此脉冲信号还是行计数器的触发信号，间接地控制振镜场扫的正程和逆程。
The horizontal line's counter is also activated by this signal to control galvanometer up and down.
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