本文针对确定性周期信号的特点,提岀了采用整周期自动跟踪电路控制采样的方法,从而能极大地降低频谱分析中的频域泄漏。本文还就振动加速度信号在线谱分析系统的设计作了详细说明,并提出了三种提高 FFT 运算速度的改进方法。 In this paper, aiming at the characteristics of deterministic periodic signal, this paper presents a method to control the sampling by full period automatic tracking circuit, which can greatly reduce the frequency domain leakage in spectrum analysis. In this paper, the design of on-line spectrum analysis system of vibration acceleration signal is described in detail, and three improved methods to improve the speed of FFT operation are proposed.