Fourier's analysis method was further used to discover frequency multiplication weak signal.
结合傅里叶分析方法进一步找出风机存在的倍频微弱信号.
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Technical characteristics mainly include frequency multiplication circuit, average algorithm filter and error calibration.
该系统在技术上的特点主要包括倍频电路 、 算术平均滤波、误差校正等.
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