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Matlab FFT - sampling frequency

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Mepe
Mepe on 19 Jun 2018
Answered: Honglei Chen on 19 Jun 2018
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

Answers (1)

Honglei Chen
Honglei Chen on 19 Jun 2018
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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