How to perform a zoom FFT on certain portion of a signal

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I have a signal with a sample rate of 200HZ, see attached. I am interested in a certain portion of the signal, so I zoomed in that section from the original signal (see figure below). I want to compute FFT (maybe zoom FFT) on that portion to see the frequencies within that region. Please I need help, thank you.
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Austin Ukpebor
Austin Ukpebor 2021년 1월 26일
Matt, your contributions on this platform and privately are a great deal to the success of my project. Thank you.

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Star Strider
Star Strider 2021년 1월 23일
First, see if the pspectrum funciton using the 'spectrogram' option will do what you want. It will segment the Fourier transform as a function of time as well as frequency. You can then easily see how the frequency content changes over time.
If that does not do what you want, please be a bit more specific.
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Star Strider
Star Strider 2021년 1월 26일
As always, my pleasure!

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