Truncate the signal with FFT, leaving only the desired frequency range or removing the unwanted frequency range, and it has actual measured sound pressure data.

Filename	Size	Update
FFT filtering\3通道.xlsx	101385	2018-03-20
FFT filtering\FFT filtering .m	1486	2018-03-29
FFT filtering\filtering.m	1878	2018-03-29
FFT filtering	0	2018-03-29

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