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weituo2002 avatar weituo2002 commented on June 8, 2024

@jianlaigeng 请问一下可以在哪个模型用什么方法得到频率啊

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wuhaixu2016 avatar wuhaixu2016 commented on June 8, 2024

您好，FFT结束之后得到一个张量，张量的第i个数值表示频率为i的周期函数的振幅，所以我们用fft结果的数值来筛选振幅最大的频率，以索引值去确定具体周期是多少。

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jianlaigeng avatar jianlaigeng commented on June 8, 2024

您好，FFT结束之后得到一个张量，张量的第i个数值表示频率为i的周期函数的振幅，所以我们用fft结果的数值来筛选振幅最大的频率，以索引值去确定具体周期是多少。
感谢您的回答，但是在下愚钝还是没理解为什么时间序列的长度除以最大振幅所对应的频率的索引值就是近似周期的长度，这是有什么基础知识的原理吗？

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jianlaigeng avatar jianlaigeng commented on June 8, 2024

@jianlaigeng请问一下可以在哪个型号用什么方法得到频率啊
没明白您说的这个型号是什么意思，作者是通过傅里叶变换得到的频率

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