The system samples analog input and then conduct FFT on the samples and then display the spectrum. Currently, the issue is the displayed spectrum line position is keeping shift between each scan. After examining the whole system, I found all the components in the system are consistency except the sample rate which varies between 9B~10B, but it always satisfies the Nyquist sampling rate(2B). My question is whether the unstable sample rate may lead to the frequency shift?
Electronic – Would unstable sample rate affect spectrum after FFT
fftsignal processing
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Best Answer
Since the frequency bins in the FFT are proportional to the sampling rate, if you change the sampling rate, you change the frequency of those bins. If you know what the sampling rate is on every particular data set, you can resample it to be consistent between all of them.