Matlab, Engineering Mathematics

i have a wav file which consists of a number of hammer impact noises. i want to break up each impact into and individual wav file. i want to ignore the first 40ms of the impact and keep 200ms after that this. i want to perform a FFT of the wav file (plot), then a power spectual of the data(plot) and extract this to excel
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i have a wav file which consists of a number of hammer impact noises. i want to break up each impact into and individual wav file. i want to ignore the first 40ms of the impact and

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