Matlab FFT - sampling frequency

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Mepe
Mepe 2018-6-19
回答： Honglei Chen 2018-6-19
For the evaluation of ultrasound measurement data the frequency analysis should be carried out by means of Matlab. A sampling frequency is set in advance. How is this defined? Is this the maximum range in the frequency spectrum that I would like to expect and evaluate? That If I have a starting frequency of, say, 20000 Hz, maybe I'm still interested in the first harmonic excitation, could I choose 50000 Hz as the sampling frequency?
Many thanks!
Frank

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回答（1 个）

Honglei Chen
Honglei Chen 2018-6-19
It should match the sampling frequency used to obtain your digital signal, otherwise your interpretation of the signal is wrong. In other words it's a meta data of your measurement.
HTH

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