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Unwanted periodicity in data

Some time-frequency analysis with the synchrosqueezed CWT, where I guess fs=10000 but this doesn't matter except for axis labels and physical interpretation. 1. ...
• 5,358

Time-varying Notch Filter in C

A few ideas: If you are implementing this as an IIR filter, use Direct Form I. This minimizes the discontinuity of the state variables (which are simply input and output). A biquad notch filter can be ...
• 32.6k