That is repeated at 48 points per octave across the frequency span of the measurement, with 10 Hz as the lowest frequency allowed and the burst bandwidth below half the sample rate as the highest. The plot is produced by convolving the windowed impulse response (using whatever current window settings have been applied to the measurement) with a complex Morlet wavelet analytic signal (a Gaussian windowed complex exponential) to extract the decay envelope then resampling that decay on a period-based scale. On a period axis the extent of a decay is the same for resonances of the same Q regardless of the frequency of the resonance. It does this by showing the way a Gaussian-shaped tone burst at each frequency would decay, but along an axis denoted in periods of the frequency rather than time. The Burst Decay mode provides a way to more easily distinguish resonances of similar Q but different frequencies. ![]() I couldn't resist slipping in one more feature before the V5.20 release, so the waterfall and spectrogram now have a Burst Decay mode.
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