Method for measuring effective value of periodic signal noise

The invention relates to a periodic signal noise effective value measuring method, which comprises the following steps of: respectively performing signal noise measurement on a target periodic digital signal and a target periodic analog signal, obtaining a series of zero crossing points of electric signals through a specific design method, and performing one-time analog-to-digital conversion at a relative time determined by the series of zero crossing points to obtain an effective value of a periodic signal noise effective value. Further calculating periodic signal noise according to a series of analog-to-digital conversion results; the whole design method is suitable for measuring the noise of the periodic signal, the system detection is convenient, and the hardware overhead is small; the anti-interference capability of the system is high; the method is simple and reasonable to implement and accurate and reliable in data. 本发明涉及一种周期信号噪声有效值测量方法，包括分别针对目标周期数字信号、目标周期模拟信号，执行信号噪声测量，通过具体设计方法，获得一系列电信号的过零点，并在一系列过零点决定的