# Resonant frequencies, decay constants, amplitudes and phases of the analytical signal: Finally, note that the error estimates for the two resonances are roughly within the same order of magnitude, so their reliability is comparable. In practice, more complicated signals (for example, a signal from a time monitor in a FDTD simulation) might require more oscillation periods, especially for accurate decay or Q-factor values, as explained above in Important notes. For this simple analytical signal only a few oscillation periods are required to get accurate values for all the resonant parameters. We sample the same signal over time intervals of different duration and show that the results are the same. ![]() The following example shows how to extract the resonances from a superposition of two decaying sinusoidal signals. ![]() ![]() Returns the frequency, decay constant, Q-factor, amplitude and phase of resonances extracted from the time trace of a purely real or complex signal within a frequency range \( \) bounding the frequency range for the search.
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