time-frequency transformation
时间、收音频率转换 FREQ RECALL
时间和频率转换 time and frequency transfer
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阶次分析是基于FFT的一种时频转换谱分析，它是变速旋转机械体振动分析的最重要的一种方法。
Order analysis based on FFT is a transform between time-domain signal and frequency-domain signal and furthermore, it is the most important vibration analysis of rotational machinery.
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