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Welcome to the embedded-tremor-challenge wiki!
According to the professor yesterday, when there is a tremor, it will pretty obviously show up on the frequency domain as a super high peak(relatively). A constant frequency would be represented by a vertical line at the frequency on a frequency domain, so intensity I don't think will matter that much, we need to be able to detect the range of the peak.
This research paper https://www.mdpi.com/1424-8220/15/10/25055 provides a fairly detailed tremor detection section. *see Quantitative Assessment of Parkinsonian Tremor
The actual time of a tremor varies from person to person. The more important factor is whether or not the power of the tremor falls into the right frequency range, like the 10-second tests shown in the research paper.