Reconstruct signal using ISTFT after cutting off frequecies

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carola forlini
carola forlini 2021-9-14
评论： Star Strider 2021-9-14
Hello,
I am applying STFT to my time series to identify the frequency evolution over time. After this, I want to cutoff certain frequencies (let's say all the frequencies < 0.7Hz) and then reconstruct the timer series using ISTFT. I tried to do it but I obtain a shorter time series.
Any suggestions?
Thank you

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Star Strider
Star Strider 2021-9-14
Set the amplitude values at those frequencies to 0 rather than eliminating them from the vector.
.

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